Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733801n&link_type=abstract
American Astronomical Society, AAS Meeting #217, #338.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of an extensive population synthesis study on the ensemble properties of the present-day Cataclysmic Variable (PDCV) distribution. Unlike previous studies, our analysis takes fully into account the nuclear evolution of the donor prior to the onset of mass transfer. One of the main conclusions is that He WD primaries are likely to contribute significantly to the PDCV population, and that their characteristic minimum orbital period (Pmin) values are different from those for systems with CO WD accretors. Additionally, the nuclear evolution of the donor tends to smear out the so-called Pmin spike for CO WD systems. The nuclear evolution of the donor also helps explain the number of systems found within the period gap. We also find a very sharp drop in the mass-transfer rate at Pmin. Assuming that the detectability of CVs scales with the mass-transfer rate, this can help explain the observational absence of "period bouncers". Although the synthetic results help explain many of the ensemble properties of PDCVs, significant discrepancies still exist (although many of these can be attributed to observational selection effects).
Goliasch J.
Nelson Lorne Archie
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