Can the quiescent accretion discs in the dwarf novae OY CAR and Z Cha be in a steady state?

Details Can the quiescent accretion discs in the dwarf novae OY CAR and Z Cha be in a steady state? Can the quiescent accretion discs in the dwarf novae OY CAR and Z Cha be in a steady state?

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..219w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 15, 1990, p. 219-230.

Astronomy and Astrophysics

Astronomy

17

Accretion Disks, Cataclysmic Variables, Dwarf Novae, Steady State, Astronomical Models, Brightness Temperature, Optical Thickness, Stellar Mass Accretion, Temperature Distribution

Scientific paper

The present effort to fit flat brightness temperature profiles in the accretion disks in OY Car and Z Cha with steady-state models of the optically thin type proposed by Tylenda (1981) and Williams (1980) fails to fit observations. Even if the gas stream penetrates deeply into an optically thick, steady-state disk, and is stripped of mass according to a particular function, this stripping function causes the stream to exhaust its mass while still in the outermost part of the disk; this again cannot account for the flat profiles while retaining the steady-state, optically thick assumption.

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