Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004rmxac..20..192t&link_type=abstract
Compact Binaries in the Galaxy and Beyond, Proceedings of the conference held 17-22 November, 2003 in La Paz, Baja California Su
Astronomy and Astrophysics
Astronomy
Binaries: Close, Novae, Cataclysmic Variables, Stars: Dwarf Novae, White Dwarfs
Scientific paper
We have undertaken a theoretical study of the impact of the accumulating envelopes on the thermal state of the underlying white dwarf (WD). This has allowed us to find the equilibrium WD core temperatures, the classical nova ignition masses and the thermal luminosities for WDs accreting at rates of 10-11 - 10-8M&sun; yr-1. These accretion rates are most appropriate to WDs in cataclysmic variables (CVs) of ( P[orb] ≲ 7 hr), many of which accrete sporadically as Dwarf Novae. Over twenty Dwarf Novae have been observed in quiescence, when the accretion rate is low and the WD photosphere is detected and T[eff] measured. Comparing our theoretical work to these observations allows us to constrain the WD mass and the time averaged accretion rate, <
"705FM >. If < "705FM > is that given by gravitational radiation losses alone, then the WD masses are > 0.8M&sun;. An alternative conclusion is that the masses are closer to 0.6M&sun;and <
"705FM > is 3-4 times larger than that expected from gravitational radiation losses.
Bildsten Lars
Townsley Dean M.
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