On the minimum mass ratio of W UMa binaries
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...
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The structure and evolution of low-mass W UMa type contact binaries are discussed by employing Eggleton’s stellar evolution code (Eggleton 1971, 1972, 1973). Assuming that these systems completely satisfy Roche geometry, for contact binaries with every kind of mass ratios (0.02∼1.0), we calculate the relative radii (R1,2/A, where R1,2 are the radii of both stars, and A the orbital separation) o...
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We observed a field in the disk of the LMC on two consecutive nights in search of rapid variable stars. We have found two pulsating stars of type RRab and δ Sct, and four binary stars, among the latter one sdB or CV below the LMC blue Main Sequence and three very close binary systems on the MS. At least one of the MS binaries, and possibly all three, are the first solar-type (W UMa-type) contac...
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Using high resolution near-infrared spectroscopy with the Keck telescope, we have detected the radial velocity signatures of the cool secondary components in four optically identified pre−main-sequence, single-lined spectroscopic binaries. All are weak-lined T Tauri stars with well-defined center of mass velocities. The mass ratio for one young binary, NTTS 160905−1859, is M2/M1 = 0.18±0.01, th...
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...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2010
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2010.16615.x