The minimum period problem in cataclysmic variables
نویسندگان
چکیده
منابع مشابه
The minimum period problem in cataclysmic variables
We investigate if consequential angular momentum losses (CAML) or an intrinsic deformation of the donor star in CVs could increase the CV bounce period from the canonical theoretical value ∼ 65 min to the observed value P min ≈ 77 min, and if a variation of these effects in a CV population could wash out the theoretically predicted accumulation of systems near the minimum period (the period spi...
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We review the recent knowledge base pertaining to causes for mass accretion variations (high/low states) in highly magnetic cataclysmic variables (i.e. polars). We then examine what theory has to say about the properties of the secondary stars (the mass donors) with respect to those CVs with very short orbital periods. Finally, we use recent observations of EF Eri in an extended low state to pr...
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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...
متن کاملOn the evolutionary status of short period cataclysmic variables
We present high-speed, three-colour photometry of seven short period (Porb 6 95 mins) eclipsing CVs from the Sloan Digital Sky Survey. We determine the system parameters via a parametrized model of the eclipse fitted to the observed lightcurve by χ minimization. Three out of seven of the systems possess brown dwarf donor stars and are believed to have evolved past the orbital period minimum. Th...
متن کاملOn the orbital period distribution of cataclysmic variables
Using the latest compilation of cataclysmic variable orbital periods by Ritter & Kolb we argue against Verbunt’s conclusion that the period gap is not significant for novalike variables. We also discuss the relation of the VY Scl stars to the dwarf novae.
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2003
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2003.06323.x