WD 1202-024: the shortest-period pre-cataclysmic variable
نویسندگان
چکیده
منابع مشابه
Brown Dwarfs and the Cataclysmic Variable Period Minimum 3
Using improved, up–to–date stellar input physics tested against observations of low– mass stars and brown dwarfs we calculate the secular evolution of low–mass donor cat-aclysmic variables (CVs), including those which form with a brown dwarf donor. Our models confirm the mismatch between the calculated minimum period (P min ≃ 70 min) and the observed short–period cut–off (≃ 80 min) in the CV pe...
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AM Her variables – synchronised magnetic cataclysmic variables (CVs) – exhibit a different period distribution from other CVs across the period gap. We show that non-AM Her systems may infiltrate the longer-period end of the period gap if they are metal-deficient, but that the position and width of the gap in orbital period is otherwise insensitive to other binary parameters (excepting the norm...
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Although a large number of orbital periods of cataclysmic variable stars (CVs) have been measured, comparison of period and luminosity distributions with evolutionary theory is affected by strong selection effects. A test has been discovered which is independent of these selection effects and is based upon the kinematics of CVs (Kolb & Stehle, 1996). If the standard models of evolution are corr...
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The color-magnitude diagram of the lower main sequence, as measured from a volume-limited sample of nearby stars, shows an abrupt downward jump between MV ∼ 12 and 13. This jump indicates that the observed mass-radius relationship steepens between 0.3 and 0.2 M⊙, but theoretical models show no such effect. It is difficult to isolate the source of this disagreement: the observational mass-radius...
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We report on the results of a spectroscopic and photometric study of a new cataclysmic variable, identified as optical counterpart of the X-ray source RXJ1554.2+2721 detected by ROSAT. The spectroscopic observations of the relatively bright (∼ 16. 5) object show systematic radial velocity variations with a semiamplitude of ∼140 km/sec. Besides the clear presence of distinct low and high states ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2017
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stx1611