21. IAU Commission 42 Organization based in Hungary that studies binary stars. http://www.konkoly.hu/IAUC42/

INTERNATIONAL ASTRONOMICAL UNION COMMISSION 42. CLOSE BINARY STARS (ETOILES BINARIES SERREES) Together with Commission 27: Variable Stars , Commission 42 is part of Division V: Variable Stars of the International Astronomical Union The Web page of Commission 42 is valid for the term 2009 to 2012 and maintained by Andras Holl at Konkoly Observatory , Hungary. Last change made on Sep 06 2010 .

22. Binary Stars Definition Of Binary Stars In The Free Online Encyclopedia. Binary Stars . two stars that are close to one another in space and that constitute a physical system whose components are bound by forces of mutual gravitational attraction. http://encyclopedia2.thefreedictionary.com/Binary stars

23. Introduction To Binary Stars Introduction to binary stars for astrophysics option of NSW HSC Physics Stage 6 course. http://outreach.atnf.csiro.au/education/senior/astrophysics/binary_intro.html

Australia Telescope Outreach and Education http://outreach.atnf.csiro.au/ The presentation of this page has been degraded because your browser lacks full support for style rules Home Education Senior ... Astrophysics Features About Us ATNF Overview History Achievements ... ATNF Work Experience Search: Go Binary Stars Binary stars are of immense importance to astronomers as they allow the masses of stars to be determined. A binary system is simply one in which two stars orbit around a common centre of mass, that is they are gravitationally bound to each other. Actually most stars are in binary systems. Perhaps up to 85% of stars are in binary systems with some in triple or even higher-multiple systems. The orbital periods and distances of binaries vary enormously. Some systems are so close that the surfaces of the stars are practically touching each other and can exchange material. Others may be separated by a few thousand Astronomical Units and have orbital periods of hundreds of years. Sir William Herschel (1738-1822) noted the apparent closeness of many stars and systematically observed them. He compiled a catalog of about 703 pairs of stars within a couple of arcseconds to each other

24. Binary Star Simulation A simulation provided by Terry Herter. http://www.astro.washington.edu/courses/labs/clearinghouse/labs/Spectbin/binary.

O RBITING B INARY S TARS This simulation is being used with the author's permission: Terry Herter, Cornell

25. Binary Stars Binary Stars. A surprisingly large fraction of the stars are in binary or multiple star systems. Sometimes the binary stars are obviously separated, like 61Cygni in the close http://hyperphysics.phy-astr.gsu.edu/hbase/starlog/bistar.html

26. Binary Stars Simple explanation of binary stars in the framework of the history of the Universe http://www.historyoftheuniverse.com/binaries.html

27. Prairie Astronomy Club: Double Stars To Follow - Part I By Martin Gaskell A five-part article by Martin Gaskell of the Prairie Astronomy Club. http://www.prairieastronomyclub.org/dblstar1.htm

Double Stars To Follow: Part II Double Stars To Follow: Part III Double Stars To Follow: Part IV Double Stars To Follow: Part V Double Stars To Follow PART I: 70 OPHIUCHI Martin Gaskell Double stars. Every amateur astronomer has heard of them. Every star atlas lists them. We've probably all glanced at a few of them. We know, in theory at least, that they orbit each other, but what about really following them as they orbit each other with a telescope? When I started out in astronomy at Junior High School age I felt that actually following a pair orbiting was something totally out of my reach. I thought I needed something costly called a filar micrometer, costing $1000, and a big refractor on a solid German equatorial mount with an accurate clock drive (costing many thousands of dollars). When I was a freshman in college I did get access to such a setup, and making a few measurements satisfied me for a while. More recently I've also learned that you don't need a $1000 filar micrometer to measure double stars, and you can use a cheap home-made equatorial. I'm now measuring the separations and position angles of double stars to an accuracy several times greater than the resolution of the Hubble Space Telescope just using a piece of cardboard and a home-made paper degree scale on "Tel'Poke" our home-made 6" f/8 Newtonian! Ask me if you'd like to know how to do this (the original article listed Martin's phone number here, but it has been removed for this web page version we hope to get Martin to write an article on how to build a "cardboard micrometer" in the future). A great thing about observing double stars is that light pollution is almost never a problem.

28. Christie. On Myspace Music - Free Streaming MP3s, Pictures & Music Downloads MySpace Music profile for Binary Stars. Download Binary Stars Acoustic / Electroacoustic / Punk music singles, watch music videos, listen to free streaming mp3s, read Binary http://www.myspace.com/wearebinarystars

29. Mass Transfer In The Binary Star Algol This site shows the dynamic hydrodynamic models have shown that the circumstellar flow in Algol is relatively independent of the initial speed and direction of the tidal stream. Rather, the flow dynamics are determined primarily by the strength of radiative cooling, which depends on the density of the gas in the mass transfer stream. http://wonka.physics.ncsu.edu/Astro/Research/Algol/

HYDRODYNAMIC SIMULATIONS OF THE MASS TRANSFER IN ALGOL John M. Blondin Michael L. Malinowski To appear in The Astrophysical Journal A preprint of this paper is available in postscript form in our Preprint Library Algol contains a short period semi-detached binary star system with a main sequence primary star and an evolved subgiant companion in close orbital motion about one another. Roche lobe overflow from the companion produces a tidal stream which free falls from the inner Lagrangian point towards the primary under the influence of gravity and the Coriolis force. We used the numerical code VH-1 to generate 2D time-dependent hydrodynamic simulations of the Algol binary. Our hydrodynamic models have shown that the circumstellar flow in Algol is relatively independent of the initial speed and direction of the tidal stream. Rather, the flow dynamics are determined primarily by the strength of radiative cooling, which depends on the density of the gas in the mass transfer stream. As cooling becomes more effective the tidal stream is deflected less by the circumstellar gas, the terminal point of the stream reaches closer to the surface of the star (eventually striking the surface), the extent of the circumstellar disk decreases, and the circumstellar flow becomes more clumpy due to thermal instability. Results from a simulation on a grid of 256 x 256 zones can be viewed by clicking on the icons below.

30. What Is A Binary Star? | Universe Today Spectroscopic binary stars are those systems in which the stars are very close and orbiting very quickly. These systems are determined by the presence of spectral lines – lines http://www.universetoday.com/24203/what-is-a-binary-star/

31. Stars And Constellations > Binary Stars The most complete astronomical observation and information onlinecalculator on this globe make your own calendar with satellites, asteroids, comets, planets, sun, and moon. http://www.calsky.com/?binaries=

32. The Double Star Library A means by which various types of binary and multiple star information can be easily disseminated among binary star astronomers in IAU Commission 26 and related commissions. http://ad.usno.navy.mil/wds/dsl.html

NOTICE TO OUR USERS Commander, Naval Meteorology and Oceanography Command, is consolidating the command's web presence in accordance with Department of Defense (DoD) and Navy guidance. The U.S. Naval Oceanography portal will be the single access point for all public facing Meteorology and Oceanography products and services. This publicly-accessible portal is currently online at http://www.usno.navy.mil , and is being populated. In the near future, non-DoD users will be redirected to this portal. DoD customers can access all operational data, products and services via the NIPRnet Naval Oceanography Portal site at https://oceanography.navy.mil (CAC required). Questions or comments can be submitted here Welcome to the Double Star Library Recent Updates: 2010 July: latest circular added 2010 July: new meeting added Jump to: Purpose of the Library IAU Commission 26 Meeting Announcements Bibliography ... Feedback IAU Commission 26: Binary and Multiple Stars (Etoiles Doubles et Multiples) Commission Membership Commission 26 Members and Other Binary Star Astronomers Commission 26 Officers Commission 26 Historical Information Commission Reports Triennial Report for 2002 - 2005: pdf 2005 Triennial Report for Circulars: html pdf Report of July 2003 business meeting at Sydney General Assembly: html postscript Triennial Report for 1999 - 2002: pdf Report of August 2000 business meeting at Manchester GA: html postscript (Inf. Circ. #142)

33. Binary Star Simulation This JAVA simulation allows the user to set the masses, orbital separation, orbital eccentricity, the inclination angle to the line of sight, and the angle of the nodes of an orbiting star pair. http://astro.ph.unimelb.edu.au/central/Mirrors/binary/binary.htm

O RBITING B INARY S TARS Description Instructions Example to try Astronomy 101/103 Cornell University Terry Herter You need a JAVA enabled browser to view this simulation. This simulation is a bit unstable and may bring down the machine you are running. DESCRIPTION: Allows you to set the masses, orbital separation, orbital eccentricity, the inclination angle to our line of sight, and the angle of the nodes of an orbiting star pair. You see the privileged (from above the orbit) and the earth view of the system (which depends on the inclination angle). The observed velocities of the two stars, and the Doppler shifted spectral lines (as seen against the combined continuum from the two stars) are also shown in the upper right box. The spectral lines associated with each star are indicated and the unshifted line positions are also marked. The movement of the spectral lines against the continuum has been greatly exaggerated for display purposes, and the difference in brightness of the two stars has been ignored. We have the following definitions: Mass 1 or Mass 2 The mass of each of the two stars.

34. Binary Stars Binary Stars. an inference from the massluminosity relation is that A all stars have equal lifetimes. B all stars have the same age. http://webs.wichita.edu/astronomy/Testbank/binary.htm

Binary Stars an inference from the mass-luminosity relation is that A all stars have equal lifetimes. B all stars have the same age. C more massive stars live longer lives. D more massive stars live shorter lives. A masses B sizes C distances D no choice double stars are important in astronomy because A all stars are double B they are very beautiful C they evolve quickly enough for us to see the changes D study of their orbits allows us to determine their physical properties observations of binary stars have helped astronomers to determine which important stellar parameter for these stars? A stellar mass B pulsation period C surface temperature D distance from Earth strong support for the theory of planet formation discussed in class is the existence of A galaxies B black holes C binary star systems D many stars similar to the sun a double line spectroscopic binary has two stars of A nearly equal brightness B low actual brightness C high actual brightness D no choice the study of binary stars is important because A they are completely different from single stars B we can measure their age C their distance is known D we can use the laws of orbits to determine their mass and size in what way will two stars in a binary system orbit each other, in general

35. Nightfall Eclipsing Binary Star Program Interactive, user-friendly binary star program for lightcurve synthesis, animated views, and data fitting. Can handle eccentric orbits, surface spots and asynchroneous rotation. http://www.hs.uni-hamburg.de/DE/Ins/Per/Wichmann/Nightfall.html

Air Earth Fire Water ... Requirements Nightfall Nightfall is an astronomy application for fun, education, and science. It can produce animated views of eclipsing binary stars, calculate synthetic lightcurves and radial velocity curves , and eventually determine the best-fit model for a given set of observational data of an eclipsing binary star system. It is, however, not able to fry your breakfast egg on your harddisk. Nightfall comes with a user guide, and a set of observational data for several eclipsing binary star systems. New: Enhanced grid of model atmospheres The screenshots show a lightcurve of the eclipsing binary star TY Boo (left), a snapshot of the animated simulation of the same star (middle), and the interactive Roche potential display (right). New: MPEG movie of OpenGL animation: output.mpg (300 kB) Details Nightfall is a mildly ultramundane code of baroque complexity (I like Verdi and Haendel on lazy sunday mornings - friday evenings are better with Iron Maiden and a good whisky). Nightfall is based on a physical model that takes into account the nonspherical shape of stars in close binary systems, as well as mutual irradiance of both stars, and a number of additional physical effects. Nightfall can handle a large range of binary star configurations, including overcontact (common envelope) systems, eccentric (non-circular) orbits, surface spots and asynchroneous rotation (stars rotating slower or faster than the orbital period), and the possible existence of a third star in the system ('third light').

36. Double Star Club Introduction | The Astronomical League The purpose of the Double Star Club is to introduce observers to 100 of the finest double and multiple stars in the heavens. http://www.astroleague.org/al/obsclubs/dblstar/dblstar1.html

Skip to Main Content Area Home About Us Contacts ... The Astronomical League Astroleague Sponsors The Astronomical League is supported by contributions from: Navigation Home Join the League Astroleague Office Email ALCON Expo 2009 ... Observing Clubs Double Star Club Introduction Double Star Club Chair: Mike Benson 2308 Dundee Lane Nashville, TN 37214-1520 E-mail: ocentaurus@aol.com Introduction Rules and Regulations I also encourage you to look at the stars with varying powers as some of these doubles are very close and require substantial power to get a clean separation of the stars. (Gamma Virginis, for instance, is currently separated by under an arc second and is expected to close to around 0.3 arc seconds around 2007. It may require more power and not everyone will be able to split it. Just do the best you can and report what you see.) To record your observations, you may use the log sheet provided, or one with similar information. If you use your own log sheets, they should include: object, date, time, power, seeing, instrument, and a drawing of the double or multiple system. Yes, I said a drawing of the double star. Now, before you panic, how hard is it to draw two dots in the box provided, with the size of the dot indicating magnitude, and the distance between the dots representing separation? Please show North and either East or West in your drawing.

37. Binary Stars, A StarTrek: Voyager Fanfic - FanFiction.Net A StarTrek Voyager Romance fanfiction with characters Paris, T. Torres, B.. Story summary A familycentered vignette in which Tom talks with Miral after school.. http://www.fanfiction.net/s/2045283/1/

Sign In Sign Up FanFiction.Net - unleash your imagination mobile edition Help Home Just In ... All . Stories: New Updated . Crossovers: New Updated General Anime ... TV Browse for Beta Readers Story Author Forum Community Support Privacy TOS Ad Blocker ... StarTrek: Voyager Binary Stars JadziaKathryn Author of 96 Stories Rated: K - Published: 09-05-04 - Complete - id:2045283 Binary Stars "How was school, Miral?" asked Tom. The best thing about his test-piloting job was that he could work just the hours Miral was in school. Of course, before she went to school, his mother had been more than happy to babysit. "Fine," she answered, biting into her cheese-and-cracker sandwich. She sounded about as far from fine as an eight-year-old could get. "You don't sound fine." She took a long drink of milk before answering. "Tina's daddy left. She woke up this morning and he was gone and her mommy was crying." "That must be very hard for her." Even now, it was difficult for B'Elanna to talk about her own father's betrayal. That was something that ran deep, he knew. "Yeah. I let her have my brownie at lunch."

38. HubbleSite - NewsCenter - Hubble Separates Stars In The Mira Binary System (08/0 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://hubblesite.org/newscenter/archive/releases/1997/26

39. PSR 1913+16 Information on the PSR 1013+16 pulsar, a part of a binary system, the discoverers of which won the Nobel Prize in 1993. http://astrosun2.astro.cornell.edu/academics/courses/astro201/psr1913.htm

The Binary Pulsar PSR 1913+16: In 1993, the Nobel Prize in Physics was awarded to Russell Hulse and Joseph Taylor of Princeton University for their 1974 discovery of a pulsar , designated PSR1913+16, in a binary system, in orbit with another star around a common center of mass. Using the Arecibo 305m antenna, Hulse and Taylor detected pulsed radio emission and thus identified the source as a pulsar , a rapidly rotating, highly magnetized neutron star . The neutron star rotates on its axis 17 times per second; thus the pulse period is 59 milliseconds. After timing the radio pulses for some time, Hulse and Taylor noticed that there was a systematic variation in the arrival time of the pulses. Sometimes, the pulses were received a little sooner than expected; sometimes, later than expected. These variations changed in a smooth and repetitive manner, with a period of 7.75 hours. They realized that such behavior is predicted if the pulsar were in a binary orbit with another star. The pulsar and its companion both follow elliptical orbits around their common center of mass. Each star moves in its orbit according to Kepler's Laws ; at all times the two stars are found on opposite sides of a line passing through the center of mass. The period of the orbital motion is 7.75 hours, and the stars are believed to be nearly equal in mass, about 1.4 solar masses. As shown in the figure here, the orbits are quite eccentric. The minimum separation at

40. PHOEBE - PHysics Of Eclipsing BinariEs PHOEBE is an infrastructure for the numerical modeling and analysis of eclipsing binary stars, using a variety of models. http://phoebe.fiz.uni-lj.si/

@import "/misc/drupal.css"; @import "/themes/slurpee/style.css"; Welcome to PHOEBE What is PHOEBE? PHOEBE news PHOEBE license PHOEBE roadmap ... Screenshots Prerequisites Operating system Required programs/libraries PHOEBE development About developers How to contribute PHOEBE TODO list PHOEBE@SourceForge ... Development mailing list PHOEBE in press Papers on PHOEBE Papers citing PHOEBE Visitors since September 2002: Development snapshots available for Jaunty Sun, 2009-05-03 05:53 32-bit Ubuntu 9.04 (Jaunty Jackalope) users can now have the latest bleeding-edge PHOEBE installed through the package repository. To activate, add the following two lines to your /etc/apt/sources.list: deb http://phoebe.fiz.uni-lj.si/debs jaunty main deb-src http://phoebe.fiz.uni-lj.si/debs jaunty main Import the authentication key: To authenticate the origin of binary packages that you install on your computer, all packages are gpg-signed . Issue the following to import the authentication key: Rescan your package list: sudo apt-get update Install phoebe-gui and/or phoebe-scripter and you will have the latest SVN snapshot of the precompiled binaries. WARNING: these are bleeding-edge binaries compiled automatically from the latest SVN snapshot, and come with no assurance to work correctly or, for that matter, to even work. Please exercise caution when using them.

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