The inception of novae transition zone oscillations

Details The inception of novae transition zone oscillations The inception of novae transition zone oscillations

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49..339p&link_type=abstract

Astrophysics and Space Science, vol. 49, no. 2, July 1977, p. 339-348.

Astronomy and Astrophysics

Astrophysics

1

Light Curve, Novae, Photosphere, Stellar Models, Hydrostatic Pressure, Oscillating Flow, Radiation Pressure, Radiative Transfer, Static Stability, Stellar Atmospheres, Stellar Luminosity

Scientific paper

The manner by which nova transition zones exhibiting semiperiodic light variations might originate is discussed. A Roche model is adopted for novae, and it is shown that a consistent picture emerges if the light variations are assumed to reflect corresponding radial variations in the nova photospheres. Consideration of the hydrostatic stability of novae indicates that the primary cause of transition-zone inception could well be hydrostatic collapse following a reduction in radiative support. This suggests that the onset of the transition zone would depend primarily on the nova mass, while the development of oscillatory behavior would depend on the ratio of gas pressure to total pressure. The specific case of V603 Aql is investigated on the assumption that the transition-zone oscillations are transient, and it is found that the decrease in mean radius was small, probably less than about 10% over the entire transition zone, for the small observed frequency change. Estimates are also obtained for the variations in temperature and bolometric luminosity.

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