Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.7012p&link_type=abstract
American Astronomical Society Meeting 207, #70.12; Bulletin of the American Astronomical Society, Vol. 37, p.1275
Astronomy and Astrophysics
Astronomy
Scientific paper
We study the nature of the Direct Impact Accretion (DIA) phase for semidetached ultra-compact non-magnetic white dwarf binaries. The DIA is very likely to happen following the onset of mass transfer in these low mass binaries due to their ultra-compact orbital size and the trajectory of mass transfer stream. We examine the orbital evolution for the DIA phase and follow the variations in separation, period, mass transfer rate, and X-ray luminosity. We find that following the onset of mass transfer, DIA can create a time window lasting from hundreds of years to thousands of years during which the orbital period decreases. This window may give a possible explanation of the observed period decrease for V407 Vul and RX J0806.3+1527 if they are diskless AM CVn binaries or direct-impact accretors.
Frank Jacki
Peng Xiao Meng
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