Photographic observation of close binaries with large magnitude differences
نویسندگان
چکیده
منابع مشابه
Close Binaries with Two Compact Objects
The coalescence of close binary systems with two compact objects (neutron stars and black holes) are considered to be promising sources of gravitational waves for the currently built laser interferometers. Here, I review the current Galactic coalescence estimates derived both theoretically and empirically. I discuss the uncertainties involved as well as ways of obtaining an upper limit to the c...
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High-resolution spectroscopic observations were obtained for two eclipsing active close binary systems, GK Hy-drae and TY Pyxidis. For GK Hya excess emission was observed in the Balmer lines and Mg i b lines while TY Pyx showed excess emission in the Balmer lines and Ca ii H & K lines. The emission from GK Hya arises from a global phenomenon associated solely with the secondary component. The l...
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It is commonly accepted that candidates for very high energy-ray sources are neutron stars, binary systems, black holes etc. Close binary systems containing a normal hot star and a neutron star (or a black hole) form an important class of very high energy-ray sources. Such systems are variable in any region of the electromagnetic spectrum and they enable us to study various stages of stellar ev...
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Rotational mixing is a very important but uncertain process in the evolution of massive stars. We propose to use close binaries to test its efficiency. Based on rotating single stellar models we predict nitrogen surface enhancements for tidally locked binaries. Furthermore we demonstrate the possibility of a new evolutionary scenario for very massive (M > 40M ) close (P < 3 days) binaries: Case...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1983
ISSN: 0252-9211
DOI: 10.1017/s0252921100009829