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

• Autorzy: Smak J.
• Języki publikacji: EN

Abstrakty

EN

Contrary to earlier conclusions it is shown that the M_V-P relation for disks with M=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 (M≈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 Σ-T_e relation, involving significant lowering of the critical temperature from its standard value of log T_crit⁰=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 Σ-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.

Słowa kluczowe

EN

accretion; accretion disks; binaries: close; novae; cataclysmic variables

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2002
• Tom: Vol. 52, No. 4
• Strony: 429--451
• Opis fizyczny: Bibliogr. 57 poz., tab., wykr.

Twórcy

autor

Smak J.

• N. Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland

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