Absolute Magnitudes, Critical Accretion Rates, and the Sigma-T_e Relation for Accretion Disks in Cataclysmic Variables

Details Absolute Magnitudes, Critical Accretion Rates, and the Sigma-T_e Relation for Accretion Disks in Cataclysmic Variables Absolute Magnitudes, Critical Accretion Rates, and the Sigma-T_e Relation for Accretion Disks in Cataclysmic Variables

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aca....52..429s&link_type=abstract

Acta Astronomica, v.52, pp.429-451, (2002).

Astronomy and Astrophysics

Astronomy

6

Accretion, Accretion Disks, Binaries: Close, Novae, Cataclysmic Variables

Scientific paper

Contrary to earlier conclusions it is shown that the M_V-P relation for disks with dot M = dot M_crit, based on the "standard" model, fails to explain the location of various types of CVs in the M_V-P diagram. In particular that, compared to this relation, the absolute magnitudes of Z Cam stars at standstill (dot M approx dot M_crit) are fainter by about 1.6 mag.
The only possible solution of this problem is a major modification of the shape of the Sigma-T_e relation, involving significant lowering of the critical temperature from its standard value of log T_crit^0 = 3.88 to 3.65. Further support for such a modification comes from B-V colors and ultraviolet fluxes.
Taking into account arbitrary assumptions and oversimplifications used in the derivation of the standard Sigma-T_e relation we suggest that its true shape must be determined empirically, by adjusting it in such a way as to produce satisfactory agreement with observations.

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