Key parameters of W UMa-type contact binaries discovered byHIPPARCOS
نویسندگان
چکیده
منابع مشابه
An observational approach for the determination of gravity darkening in contact binaries of W UMa type
A new method for the determination of the gravity darkening exponents in close binaries of W UMa type is presented. The method is based on Kopal’s method of Fourier analysis of the light changes of eclipsing variables in the Frequency Domain. In the analysis, the exponents for both components of a W UMa system are assumed to be the same. First, the method was successfully applied to two theoret...
متن کاملRelation between energy transfer and evolution of W UMa-type binaries
In the present article the relation between the energy transfer rate from the primary to the secondary and the evolutionary degree of W UMa-type binaries is given and the energy transfer rates and the evolution degrees of three W UMa-type contact binaries (TV Mus, SS Ari and RZ Com) are calculated. The analyzed results show that the maximum value of the energy transfer rate is basically determi...
متن کاملRadio Survey of W UMa-type Systems
12 W UMa-type systems were observed at 3.6 cm with a goal to compare their radio luminosities with those of non-contact, rapidly rotating, late-type stars. Only 3 systems, all of spectral type K, have been detected. The detections and (low) upper limits for remaining systems con rm the strong under-luminosity of W UMa-type systems. VW Cep, which was been detected several times before, has been ...
متن کاملContact binary stars of the W UMa type as distance tracers
Contact binaries can be used for distance determinations of stellar systems. They are easy to discover and identify and are very abundant among solar-type stars, particularly for MV > +3. The period–luminosity–colour (PLC) relations have similar properties to those for pulsating stars and can currently predict individual values of MV to about ±0.25 mag.
متن کاملEvolutionary status of late-type contact binaries
An abstract should be given A new scenario for evolution of contact binaries is presented and discussed. Arguments are given that W UMa-type systems are formed from detached binaries which lose angular momentum via magnetized wind. This takes typically several Gyr. Such an age is sufficient for the initially more massive component to deplete hydrogen in its core and to fill the Roche lobe. As a...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20034578