Close Binaries in the 21st Century: New Opportunities and by Alvaro Gimenez, Edward Guinan, Panagiotis Niarchos, Slavek

By Alvaro Gimenez, Edward Guinan, Panagiotis Niarchos, Slavek Rucinski

An foreign convention entitled "Close Binaries within the 21st Century: New possibilities and Challenges", used to be held in Syros island, Greece, from 27 to 30 June, 2005.

There are many binary big name platforms whose parts are so shut jointly, that they have interaction in numerous methods. Stars in such platforms don't go through all phases in their evolution independently of one another; actually their evolutionary direction is considerably plagued by their partners. procedures of interplay comprise gravitational results, mutual irradiation, mass trade, mass loss from the approach, phenomena of prolonged atmospheres, semi-transparent atmospheric clouds, variable thickness disks and gasoline streams.

The zoo of shut Binary structures comprises: shut Eclipsing Binaries (Detached, Semi-detached, Contact), excessive and Low-Mass X-ray Binaries, Cataclysmic Variables, RS CVn structures, Pulsar Binaries and Symbiotic Stars. The examine of those binaries prompted the advance of latest branches of astrophysics facing the constitution and evolution of shut binaries and the interplay results displayed by means of those interesting gadgets. shut Binaries are vintage examples of the basic contribution that stellar astrophysics makes to our common figuring out of actual tactics within the universe.

Ground-based and area surveys will realize many new shut binaries, that have been formerly unknown. sooner or later, new ways can also be attainable with hugely effective photometric searches searching for very shallow eclipses, comparable to these produced by means of Earth-like extra-solar planets.

Contributions to this convention coated the most recent achievements within the box and mirrored the state-of-the-art of the dynamically evolving quarter of binary celebrity research.

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Astron. Astroph. : New Astron. 6, 51 (2001) ` Astron. Astroph. : Astroph. J. : Astroph. J. : Acta Astron. : Astroph. J. V. 2006 Abstract The formations of the blue straggler stars and the FK Com-type stars are unsolved problems in stellar astrophysics. One of the possibilities for their formations is from the coalescence of W UMa-type overcontact binary systems. 25) overcontact binary stars are a very important source to understand the phenomena of Blue Straggler/FK Com-type stars. Recently, 12 W UMa-type binary stars, FG Hya, GR Vir, IK Per, TV Mus, CU Tau, V857 Her, V410 Aur, XY Boo, SX CrV, QX And, GSC 619-232, and AH Cnc, were investigated photometrically.

The well-detached nature of the planet-star system also allows for the adoption of simplified equations for spherical components and thus methods based on the direct evaluation of the α functions can be used efficiently. Gim´enez (2006) already discussed some of the possible deviations from the Springer assumption of spherical components, particularly with respect to the parent star, which were found them to be negligible, but some further comments are necessary concerning the shape of the planet.

The analysis results for the third body orbit were given in Table 1. 0010M . 022 M . 014. For magnetic activity cycle we used the amplitude and period of the cyclic variation and calculated the concerning parameters with Applegate (1992)’s formulation as in Table 1 assuming that the primary component is the active one. 1 Astrophys Space Sci (2006) 304:33–35 3. Conclusions An O–C analysis for V839 Oph based on all available eclipse timings together with newly determined ones is presented. The orbital period of the binary star shows cyclic variation superimposed on a quadratic variation.

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