The spectral evolution of dwarf nova outbursts

Details The spectral evolution of dwarf nova outbursts The spectral evolution of dwarf nova outbursts

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..319c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 1, 1987, p. 319-332.

Astronomy and Astrophysics

Astrophysics

43

Dwarf Novae, Stellar Evolution, Stellar Models, Stellar Oscillations, Stellar Spectra, Stellar Structure, Binary Stars, Optical Thickness, Stellar Mass Accretion, Ultraviolet Spectra, White Dwarf Stars

Scientific paper

The authors present calculations of the spectral evolution of disk instability models for dwarf nova outbursts. Observed stellar spectra are used to model the radiation emitted by optically thick annuli within the disk. It is found that eruptions in disks with low background accretion rates begin near the white dwarf and quickly spread to larger disk radii. The continuum flux rises simultaneously at all wavelengths in these "inside-out" outbursts. Outbursts in disks with higher mass-transfer rates commence near the outer edge of the disk. The optical continuum flux rises before the UV continuum by ≡0.1 - 0.3 day for the parameters chosen in this study, which is smaller than the ≡0.5 - 1.0 day delays observed in several dwarf novae.

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