Dwarf novae: Observational results and their interpretation. III - What separates dwarf novae from novae, and what characteristics do they share?

Details Dwarf novae: Observational results and their interpretation. III - What separates dwarf novae from novae, and what characteristics do they share? Dwarf novae: Observational results and their interpretation. III - What separates dwarf novae from novae, and what characteristics do they share?

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983s%26w....22..404v&link_type=abstract

Sterne und Weltraum (ISSN 0039-1263), vol. 22, Aug.-Sept. 1983, p. 404-407. In German.

Physics

1

Dwarf Novae, Light Curve, Stellar Evolution, Binary Stars, Stellar Models, Stellar Oscillations, Stellar Spectra

Scientific paper

Dwarf novae (DN) and novae (N) are compared in terms of physical characteristics and outburst behavior. The components, periods, white-dwarf masses, system dimensions, and spatial densities of DN and N are shown to be similar; and their different outburst profiles are explained as two phases of a recurring, cyclical evolution: a cataclysmic binary exhibits the behavior of a DN during long periods between N-type outbursts. The N-outburst, postnova, BV Pup, U Gem, Z Cam, UX-UMa (prenova), and new-N-outburst phases are described and illustrated with a typical light curve. The 'common-envelope' model of cataclysmic-binary development is discussed, and the DN-N cycle is shown to be a part of the developmental sequence. The cycle is considered to be driven by a periodic variation of disk mass and accretion rate (with a period on the order of 100,000 y) and a secular decrease in orbital period and secondary-component mass (over a span of 10 to the 10th y).

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