White dwarf masses in cataclysmic variables
نویسندگان
چکیده
منابع مشابه
Evidence of Precession of the White Dwarf in Cataclysmic Variables
Cataclysmic Variables (CV) are close binary systems, in which the primary, the more massive star, is a white dwarf. CVs usually exhibit a number of periodicities, most of which are now understood. However, recently, a new phenomenon was discovered that does not fit the standard picture. Two objects have been discovered to show periods that are much longer than orbital, and have no relation to i...
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Binary evolution predicts a population of helium core (M < 0.5 M⊙) white dwarfs (WDs) that are slowly accreting hydrogen-rich material from low mass main sequence or brown dwarf donors with orbital periods less than four hours. Four binaries are presently known in the Milky Way that will reach such a mass-transferring state in a few Gyr. Despite these predictions and observations of progenitor ...
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There are now four dwarf novae known with white dwarf primaries that show large amplitude non-radial oscillations of the kind seen in ZZ Cet stars. We compare the properties of these stars and point out that by the end of the Sloan Digital Sky Survey more than 30 should be known.
متن کاملA search for brown - dwarf like secondaries in cataclysmic variables ⋆
We present VTL/ISAAC infrared spectroscopy of a sample of short orbital period cataclysmic variables which are candidates for harboring substellar companions. We have detected the K i and Na i absorption lines of the companion star in VY Aqr. The overall spectral distribution in this system is best fit with a M9.5 type dwarf spectra, implying a distance of 100 ± 10 pc. VY Aqr seems to fall far ...
متن کاملThe Formation of Cataclysmic Variables with Brown Dwarf Secondaries
The present-day formation of cataclysmic variables (CVs) with brown dwarf (BD) secondaries (0.013 M⊙ ≤ Ms ≤ 0.075 M⊙) is investigated using a population synthesis technique. Results from the latest, detailed models for BDs have been incorporated into the population synthesis code. The present-day orbital period distribution of zero-age CVs (ZACVs) that form with BD secondaries is calculated. Fo...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2015
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201323018