Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....68..113g&link_type=abstract
Astronomy and Astrophysics, vol. 68, no. 1-2, Aug. 1978, p. 113-121.
Astronomy and Astrophysics
Astrophysics
12
Dynamic Stability, Radiation Pressure, Stellar Envelopes, Stellar Evolution, Stellar Mass Accretion, Interstellar Gas, Optical Thickness, Protostars, Stellar Models
Scientific paper
The possibility is investigated that in accretion flows where radiation pressure is important, fluctuations in the infall rate can be amplified by the resulting enhanced luminosity. A simple model of spherical accretion is first considered where no such modes are found, but when the analysis is extended to include various aspects of cocoon stars luminosity variations are predicted. In general these have a short period on a dynamical time scale and may be suppressed by the neglected physical details. However, if radiation pressure is comparable to gravity, periods on a dynamical time scale appear in qualitative agreement with the numerical calculations of cocoon-star models by Yorke and Kruegel (1977). It is emphasized that variations in the opacity and significant radiation pressure are necessary for overstability in these optically thin flows.
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