On the Balmer jump in dwarf novae during the outburst

Details On the Balmer jump in dwarf novae during the outburst On the Balmer jump in dwarf novae during the outburst

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238..935l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, June 1, 1989, p. 935-943.

Astronomy and Astrophysics

Astronomy

12

Accretion Disks, Balmer Series, Cataclysmic Variables, Dwarf Novae, Astronomical Models, Main Sequence Stars, Stellar Spectra, White Dwarf Stars

Scientific paper

Published observations of the size of the Balmer jump in dwarf novae during the course of an outburst are analyzed. Two kinds of behavior have been identified: (1) an outbust in which the Balmer jump is zero throughout the outburst; and (2) an outburst in which the Balmer jump is very strong in absorption during the rise, gradually declines as the outburst proceeds, and becomes zero some time after the outburst maximum. It is shown that the atmosphere structures inferred from star-like accretion disk spectra cannot account for the present observations, requiring a much flatter temperature gradient. It is suggested that models of dwarf novae should take energy generation in the atmosphere into account.

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