Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..177m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 2, May 15, 1992, p. 177-185. Research supporte
Astronomy and Astrophysics
Astrophysics
61
Accretion Disks, Binary Stars, Novae, Stellar Evolution, Stellar Mass Accretion, Symbiotic Stars, Gas Ionization, Main Sequence Stars, Thermonuclear Reactions, White Dwarf Stars
Scientific paper
Three popular explanations for the novalike eruptions observed in symbiotic binary stars are discussed, and model predictions are compared with recent observations. The present model predicts a long-duration, constant-luminosity phase following visual maximum, and observations of the symbiotic novae and several steady-burning sources confirm this feature of thermonuclear runaway calculations. At least two symbiotics erupt when the accretion rate from a circumstellar disk onto a solar-type central star increases by 1-2 orders of magnitude. Simple accretion models emit about 50 percent of the gravitational energy in the disk and the remainder in a hot boundary layer between the disk and central star. Observations of CI Cyg and AX Per support this picture for accretion rates below about 0.0004 solar mass/yr, but boundary layer emission vanishes for higher accretion rates. Observations of extra reddening and the appearance of high-ionization lines in R Aqr are associated with an increase in the Mira mass-loss rate.
Kenyon Scott. J.
Mikolajewska Joanna
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