81. Science & Technology: Binary Stars binary stars. binary stars. In W UMatype contact binaries make up about 1 per cent of the total number of solar type stars. They http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=31441

82. Science Blog - Low-mass Stars In Binary Stars Appear To Behave Like High-mass, E Lowmass stars in binary stars appear to behave like high-mass, evolved stars Posted on Tuesday, May 27 @ 115623 PDT by BJS. Space http://www.scienceblog.com/community/article1688.html

Main Menu Home AvantGo Contact Directory New! Elsewhere Forums Science Gifts New! Search Submit News Surveys Topics ... Your Account BlogAds Low-mass stars in binary stars appear to behave like high-mass, evolved stars Posted on Tuesday, May 27 @ 11:56:23 PDT by BJS Astronomers Steve Howell of the University of California, Riverside and Thomas E. Harrison and Heather Osborne of New Mexico State University have found from their observations of over a dozen mass-losing stars in 'cataclysmic variables' that most of the secondary stars do not appear to be normal main sequence stars in terms of their apparent abundances. To various degrees, each star seems to have low to no carbon and other odd mixtures of elements such as sodium and calcium, the astronomers announced today at the American Astronomical Society meeting in Nashville, Tenn. From University of California at Riverside Astronomers show that low-mass stars in binary stars appear to behave like high-mass, evolved stars (May 26, 2003) RIVERSIDE, Calif. Astronomers Steve Howell of the University of California, Riverside and Thomas E. Harrison and Heather Osborne of New Mexico State University have found from their observations of over a dozen mass-losing stars in 'cataclysmic variables' that most of the secondary stars do not appear to be normal main sequence stars in terms of their apparent abundances. To various degrees, each star seems to have low to no carbon and other odd mixtures of elements such as sodium and calcium, the astronomers announced today at the American Astronomical Society meeting in Nashville, Tenn.

83. Eclipsing Binary Simiulation ECLIPSING BINARIES. Astronomy DESCRIPTION Orbiting stars which are separated by a small distance may pass in front of one another. It http://instruct1.cit.cornell.edu/courses/astro101/java/eclipse/eclipse.htm

E CLIPSING B INARIES Astronomy 101/103 Terry Herter Description Instructions Example to try You need a JAVA enabled browser to view this simulation. Please note: there is an error in the routine at zero degrees use one degree instead. DESCRIPTION: Orbiting stars which are separated by a small distance may pass in front of one another. It is not possible for astronomers to see the individual stars, but there will be a change in the total light coming from the two stars when they "eclipse" one another. This simulation shows how this eclipse happens. We have the following definitions: Inclination angle Angle of the orbital plane of the stars to our line-of-sight. o - edge on o - face on Separation The distance between the two stars in solar radii. Star 1 or Star 2 The spectral type of the stars. INSTRUCTIONS: Adjust the inclination angle, separation, and star types. Click "enter values" to update the simulation parameters. Use "pause" to start and stop the simulation, if desired. If the picture is messed up at anytime, use "clear graph" to redraw it.

84. Michele's Home Page Information on research projects primarily dealing with variable stars (XX Leo eclipsing binary star, SMC variable stars, novae). Provides links to a growing number of astronomy, space, and science related sites. http://www.astro.psu.edu/users/stark/

85. HubbleSite - NewsCenter - 1997 - 26 - Hubble Separates Stars In The Mira Binary Hubble Space Telescope News Release/Paper about the discovery of the atmospheric interaction between the giant star Mira and its white dwarf companion star. http://oposite.stsci.edu/pubinfo/PR/97/26/PR.html

news GALLERY DISCOVERIES FUN ... releases Hubble Separates Stars in the Mira Binary System View all images Although the giant star Mira has been known for about 400 years, astronomers have had to wait for the Hubble telescope to provide the first ultraviolet-light images of the extended atmosphere of the cool red giant star and its nearby, hot companion. By giving astronomers a clear view of the individual members of this system, Hubble has provided valuable insights into other types of double-star systems where the stars are so close they interact with one another. In ultraviolet light, Hubble resolves a small, hook-like appendage extending from Mira and pointing towards the smaller companion. This material could be gravitationally drawn towards Mira's mate. Read the full press release text Credit: Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) and NASA Find more news releases: About Star Binary Star From about us contact us Cosmology Exotic Galaxy Miscellaneous Nebula Solar System Star Star Cluster Survey more options Search all of HubbleSite: Have you seen this?

86. Binary Star Systems Versus Planetary System Sun. Formation of binary Star Systems. The most common occurrence of stars appears to be as parts of binary (twostar) systems. This http://csep10.phys.utk.edu/astr161/lect/solarsys/binary.html

Binary Star Systems Versus Planetary Systems Our Solar System may not be the norm for stars in the Universe. The observational evidence is that most stars are parts of multiple star systems, not single stars like our Sun. Formation of Binary Star Systems The most common occurrence of stars appears to be as parts of binary (two-star) systems. This suggests an alternative to the nebular hypothesis illustrated in the following figure. Alternative to the nebular hypothesis that leads to binary star formation Although planets might still form in such binary systems by a similar mechanism as discussed before, it is an open question whether they would have stable orbits that would keep them bound in the system without running into the stars. Another question, assuming such planets were on stable orbits, is whether they could have temperature ranges favorable for the formation of life. If Jupiter Had Become a Star . . . We note in this connection that if Jupiter had been about 100 times more massive than it is, it would have formed a star instead of a planet. Thus, maybe the Solar System very nearly became a binary star system instead of a single star with planets. We may speculate that in that case the Earth might not even exist, or even if it existed would be in an orbit giving surface conditions not favorable to the evolution of life. Next Back Top Home Help

87. Visual Binaries Orbits for binary star systems. Here are two interactive animations that allow you to explore the motion of the stars in a binary star system http://csep10.phys.utk.edu/astr162/lect/binaries/visual.html

Visual Binaries The Castor binary system Some binary systems are sufficiently close to Earth and the stars are well enough separated that we can see the two stars individually in a telescope and track their motion over a period of time. We term such systems visual binaries Example: The Castor System The adjacent image shows one example, the star Castor, which is actually a visual binary as observed through a telescope (it was the first binary discovered, by Herschell in 1790). In this case the plot is of the orbit of one star relative to the other and the year of the observation is given at the corresponding point on the orbit. Orbits for Binary Systems In reality, binary star systems are governed by Kepler's laws, as modified by Newton to account for the effect of the center of mass. Then each star executes an elliptical orbit such that at any instant the two stars are on opposite sides of the center of mass. The orbits generally are as depicted in the following figure. Orbits for binary star systems Sirius and Companion The Sirius Binary System An example is shown in the image to the left of the Sirius binary star system, which consists of a more normal

88. Astronomy Supplement - Binaries And Clusters stars in binary Systems 14.2.1. Visual Binaries; 14.2.2. Spectroscopic Binaries; 14.2.3. Eclipsing Binaries; 14.2. stars in binary Systems. http://www.physics.gmu.edu/classinfo/astr103/CourseNotes/ECText/ch14_txt.htm

Astronomy Supplement 14. Binaries and Star Clusters Latest Modification: October 26, 1998 Table of Contents 14.1. Stellar Motions in the Solar Neighborhood 14.1.1. The Milky Way 14.1.2. Stellar Motions 14.1.3. The Sun's Motion Among the Local Stars 14.2. Stars in Binary Systems 14.2.1. Visual Binaries 14.2.2. Spectroscopic Binaries 14.2.3. Eclipsing Binaries 14.2.4. Multiple-Star Systems 14.2.5. How Many Stars Are Binaries? 14.3. Mass-Luminosity Relation 14.4. Stars in Clusters 14.4.1. General Features of Clusters 14.4.2. Open Clusters Box 14.1. - Distances of Open Clusters by Main-Sequence Fitting 14.4.3. Associations 14.4.4. Globular Clusters 14.4.5. H-R Diagrams for Clusters Although it has been known for over 200 years that some stars are gravitationally bound to each other in binary systems, multiple star systems, and clusters, evidence now suggests that the vast majority, if not all stars either are (or were) bound to other stars (or planetarylike bodies). Thus the fact that stars are members of a physical group of two or more stars is not the exceptional situationit is more the rule. Obviously those processes that create stars and guide their evolution are ones which typically form several bodies at the same time, albeit that some of these bodies may be satellites rather than companion stars. And for many stars, these processes are ones involving the mutual gravitational interplay between bodies throughout the course of their lives. In Chapter 22, we will consider this evolutionary interplay and its meaning for binary systems.

89. Spacetime Warpers: Prime Suspects motions of this deadly duet could prove to be a strong source of gravity waves, as might other binary systems containing white drawfs or neutron stars. http://archive.ncsa.uiuc.edu/Cyberia/NumRel/RelUniverse2.html

Forward Back Map Glossary ... Information Spacetime Warpers: Prime Suspects Scattered amongst the billions of stars in our galaxy alone, a sizeable number of them are thought to explode, collapse or collide each year. Some estimates suggest that the Milky Way may contain as many as 30,000 pairs of orbiting neutron stars, many of which eventually collide with each other. Beyond our home galaxy are myriads of other galaxies, each harboring potential spacetime warpers. With such odds, it's no surprise that some physicists are confident of detecting a variety of gravitational wave emitters. What are the prime suspects? Where are the best places to look? The suspects come in many different sizes and answer to a variety of descriptions. Some are "merely" stellar, others truly supermassive. Some reside in our own galaxy The Milky Way. Others lurk beyond, even at the very edges of spacetime itself. Exploding Stars Collapsed Stars Binary Systems Colliding Stars ... Putting It All Together Exploding Stars Supernova 1987A Before, After, and Close-up Before

90. HubbleSite - NewsCenter - Archive - Browse By Category (more). 8/6/1997. Hubble Separates stars in the Mira binary System STScI1997-26. Hubble Separates stars in the Mira binary System. http://hubblesite.org/newscenter/newsdesk/archive/releases/category/star/binary

news GALLERY DISCOVERIES FUN ... binary star Browsing in: star binary star Results 1 - 10 of 11 STScI-1998-19 Hubble Takes First Image of a Possible Planet around Another Star and Finds a Runaway World The Hubble telescope has given astronomers their first direct look at what is possibly a ... ( more STScI-1998-07 A New Class of X-ray Star? Teaming up space telescopes to make simultaneous ultraviolet and X-ray observations, ... ( more STScI-1997-39 One Star's Loss is Another's Gain: Hubble Captures Brief Moment in Life of Lively Duo Some stars in double-star systems have found a quick way to lose weight by dumping their extra ... ( more STScI-1997-26 Hubble Separates Stars in the Mira Binary System Although the giant star Mira has been known for about 400 years, astronomers have had to wait ... ( more STScI-1995-48 Astronomers Announce First Clear Evidence of a Brown Dwarf Astronomers have made the first unambiguous detection of an elusive type of object known as a ... ( more STScI-1995-33 Hubble Spies a Really Cool Star This Hubble telescope picture reveals one of the least massive and coolest stars ever seen ... ( more STScI-1995-23 Hubble Probes the Workings of a Stellar Hydrogen Bomb Peering into the heart of two recently exploded double-star systems, the Hubble telescope has ... (

91. Binary And Multiple Stars binary and Multiple stars. M binary Click here to view a binary star from Messier s catalog Links. binary and multiple stars are common in the universe. http://www.seds.org/messier/bina.html

Binary and Multiple Stars Click here to view a binary star from Messier's catalog The icon shows the 4-star system Binary and multiple stars are common in the universe. Stellar formation results in multiple systems at least as often as in single stars like our Sun, as observations suggest. The component stars in multiple systems orbit each other, and move around their center of mass, because of their mutual gravitational interaction, an effect which can be noted by observation of changes of their relative positions and radial velocities, and are all at about the same distance from us. Moreover, there frequently occur chance alignments of optical double or multiple stars, the "member" stars of which all lie at different, independent distances. These can be distinguished from physical binaries by observation, as the "component" stars, at their different distances, move independent from each other and show different and mutually uneffected velocities (radial velocities and proper motions). Although Messier's catalog was intended to contain only nebulous objects which may be taken for comets, and which we today have found to be clusters, nebulae, or galaxies, and not binary or multiple stars which hardly fall in this category, two have found their way into the Messier catalog:

92. CNN.com - Surprise Planet Discovered In Twin Star System - Oct. 9, 2002 Since most stars in our galaxy are actually members of binary or even A number of socalled extrasolar planets have been detected in other binary star systems. http://www.cnn.com/2002/TECH/space/10/09/binary.planet/

CNN Europe CNN Asia Languages Spanish Portuguese German Italian Korean Arabic Japanese On CNN TV Transcripts Headline News CNN International ... Special Reports SERVICES Video E-Mail Services CNNtoGO SEARCH Web CNN.com Surprise planet discovered in twin star system 'This result has far-reaching implications,' astronomer says By Richard Stenger (CNN) Artist's interpretation of the Gamma Cephei stars and planet Story Tools (CNN) The first planet found in a close-knit double star system suggests that the galaxy possesses many more planets than previously estimated. Unlike our sun, a rare solitary specimen, the majority of Milky Way stars have companions. The discovery means that similar binary star systems could host planets as well, astronomers announced Wednesday. The planet is more massive than Jupiter and orbits the primary star in the double system, slightly farther than the average distance between Mars and the sun, the scientists said. It completes one orbit every 2.5 years. The larger star is about 1.6 times as massive as the sun. Like the found planet, the smaller companion star goes around the larger star, at about the same distance as Uranus does the sun. "This is the first time that we find a planet in a relatively close binary system," said Michael Endl of the University of Texas at Austin, a member of the team studying the star system.

93. Binary Star Observations show that most stars are binary, or even multiple – for example, the nearest star system to the Sun, Rigil Kent (Alpha Centauri). http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0010271.html

Your browser does not support inline frames or is currently configured not to display inline frames. // Show bread crumbs navigation path. breadcrumbs('four'); //> ENCYCLOPAEDIA Hutchinson's Encyclopaedia Men's Health ... Wildlife Frames not supported Frames not supported Encyclopaedia Search Click a letter for the index A B C D ... Z Or search the encyclopaedia: binary star Rigil Kent (Alpha Centauri). One of the stars in the binary system Epsilon Aurigae may be the largest star known. Its diameter is 2,800 times that of the Sun. If it were in the position of the Sun, it would engulf Mercury, Venus, Earth, Mars, Jupiter, and Saturn. A spectroscopic binary is a binary in which two stars are so close together that they cannot be seen separately, but their separate light spectra can be distinguished by a spectroscope. Another type is the eclipsing binary , a double star in which the two stars periodically pass in front of each other as seen from Earth. When one star crosses in front of the other, the total light received on Earth from the two stars declines. The first eclipsing binary to be noticed was Algol, in 1670, by Italian astronomer Germniano Montanari. makeButton("REFERENCE.HOME","R1")

94. Binary Star Definition Of Binary Star. What Is Binary Star? Meaning Of Binary St binary star. Word Noun, 1. binary star a system of two stars that revolve around each other under their mutual gravitation http://www.thefreedictionary.com/binary star

Dictionaries: General Computing Medical Legal Encyclopedia Binary star Word: Word Starts with Ends with Definition Noun binary star - a system of two stars that revolve around each other under their mutual gravitation binary double star Aldebaran - the brightest star in Taurus Algol - second brightest star in Perseus; first known eclipsing binary Alpha Centauri Rigil Rigil Kent - brightest star in Centaurus; second nearest star to the sun Altair - double star 15.7 light years from Earth; the brightest star in the Aquila constellation Antares - the brightest star in Scorpius Epsilon Aurigae - the largest known star Procyon - the brightest star in Canis Minor Beta Orionis Rigel - the brightest star in Orion Canicula Dog Star Sirius Sothis - the brightest star in the sky; in Canis Major star - (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior Vega - the brightest star in the constellation Lyra Legend: Synonyms Related Words Antonyms Some words with "Binary star" in the definition: Aldebaran ALGOL Alpha Centauri Altair ... Vega Previous General Dictionary Browser Next binary digit binary file Binary logarithms ... bindable Full Dictionary Browser Binary notation Binary notation (enc.)

95. Dictionary.com/binary Star 3 entries found for binary star. binary star. n a system of two stars that revolve around each other under their mutual gravitation syn binary, double star. http://dictionary.reference.com/search?q=binary star

96. Binary Star Concept From The Astronomy Knowledge Base At least half of the stars in the solar neighborhood are members of binary (or multiple) systems. (See photometric binaries; optical pairs.). binary star. http://www.site.uottawa.ca:4321/astronomy/binarystar.html

Astronomy View all facts Glossary Help ... star system Next star bright giant Up star star system Previous star Beta Pictoris binary star subject fact binary star has number of stars has orbital period has definition A system of two stars orbiting around a common center of gravity. Visual binaries are those whose components can be resolved telescopically (i.e., angular separation > 0'.5) and which have detectable orbital motion . Astrometric binaries are those whose dual nature can be deduced from their variable proper motion ; spectroscopic binaries, those whose dual nature can be deduced from their variable radial velocity . At least half of the stars in the solar neighborhood are members of binary (or multiple) systems. (See photometric binaries; optical pairs.) is a kind of star is a kind of star system star system has abundance half the stars in the solar neighborhood are members of star systems star has star surface temperature has spectral type has V magnitude has B magnitude has U magnitude has position on celestial sphere from the point of view of Earth has parallax from the point of view of Earth 's orbit has proper motion has radiation at surface which is diffused out from the hotter core has energy source gravitational contraction and or fusion has energy production which takes place primarily within the core has surface density which depends on luminosity class has surface temperature greater than 1000 Kelvin has apparent magnitude has absolute magnitude has age has catalog star catalog has material hydrogen, helium

97. Spaceflight Now | Breaking News | First Planet Found Orbiting Close-in Binary St Astronomers have found planets orbiting stars in binary systems before, but the stars in those binary systems were a hundred times farther apart than those of http://spaceflightnow.com/news/n0210/11planet/

First planet found orbiting close-in binary star MCDONALD OBSERVATORY NEWS RELEASE Posted: October 10, 2002 Astronomers with the McDonald Observatory Planet Search project have discovered the first planet orbiting a star in a close-in binary star system. The discovery has implications for the number of possible planets in our galaxy, because unlike the Sun, most stars are in binary systems. The team announced their finding in a news conference at the American Astronomical Society's Division of Planetary Sciences meeting. Artist's conception of the planet and its view of the two stars that make up the Gamma Cephei system. The planet orbits the bright yellow star on the right every 2.5 years. Credit: Tim Jones/McDonald Observatory Artie Hatzes (Thueringer Landessternwarte Tautenburg), Bill Cochran (UT-Austin McDonald Observatory), and colleagues found that the planet orbits the larger star of the binary system Gamma Cephei, about 45 light-years away in the constellation Cepheus. The primary star is 1.59 times as massive as the Sun. The planet is 1.76 times as massive as Jupiter. It orbits the star at about 2 Astronomical Units (A.U.), a little further than Mars's distance from the Sun. (An A.U. is the distance from Earth to the Sun.) The second, relatively small star is only 25 to 30 A.U. from the primary star about Uranus' distance from the Sun. Astronomers have found planets orbiting stars in binary systems before, but the stars in those binary systems were a hundred times farther apart than those of Gamma Cephei, Cochran said. "The stars were far enough apart to be essentially acting totally independently," he said.

98. Binary Star Entropy Entropy A measurement of the probability of an outcome. . Space, is dark. Between the glowing embers of the nuclear fires that are the stars, things hide. http://www.binstar.com/?page=entropy

99. Binary Star --  Encyclopædia Britannica binary star Encyclopædia Britannica Article. Ascella is a binary star, which is a system of two stars that revolve around each other. http://www.britannica.com/eb/article?eu=81365&tocid=0&query=star

100. Chandra :: Photo Album :: M15 :: 06 Sep 01 The broader implication of the Chandra discovery is that binary star systems with a neutron star orbiting a normal star may be common in globular clusters. http://chandra.harvard.edu/photo/cycle1/m15/

Two X-ray Binary Systems in the Globular Cluster M15 NASA/GSFC/N.White, L.Angelini Jpeg Tiff PS Chandra's image of a puzzling X-ray source in the globular star cluster M15 shows that it is not one neutron star binary system, but two neutron star binary systems that appear so close together (2.7 seconds of arc) that they were indistinguishable with previous X-ray telescopes. In the 1970's astronomers discovered one neutron star binary system in M15, called 4U2127, with the Uhuru X-ray satellite. Subsequent data from X-ray telescopes indicated that the neutron star itself was not directly visible in X-ray light because it was hidden by an accretion disk of hot matter swirling from a companion star onto the neutron star. This picture was put into doubt when the Japanese Ginga X-ray satellite saw luminous X-ray bursts from the region in 1990. The length of the burst and other light characteristics implied that the surface of the neutron star was directly visible, in contradiction with earlier observations.

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