Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.202..273o&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 202, no. 2, p. 273-288.
Astronomy and Astrophysics
Astrophysics
4
Novae, Stellar Envelopes, Stellar Mass Accretion, Thermonuclear Reactions, White Dwarf Stars, Inhomogeneity, Stellar Models, Stellar Temperature
Scientific paper
A classical nova may accrete a nonhomogeneous envelope, which can result in the ignition of a local thermonuclear runaway on the surface of the white dwarf. We studied the propagation of thermal flows along the meridian in the hydrogen rich envelope, to find the conditions under which a thermonuclear runaway is not spherically symmetric. We included mass accretion and tested the effect of temperature inhomogeneities in the secular evolution of the envelope, supposing perturbations with different wavelengths, ranging from very small to comparable with the radius of the white dwarf. The calculations were stopped at the onset of a thermonuclear runaway, when the hydrodynamic expansion starts. We found the ranges of accretion rates and masses of white dwarfs for which the runaway ignites locally. The propagation time of the runaway along the meridian may be as long as days and weeks. 'Local' thermonuclear runaways can explain the asymmetries and inhomogeneities of the nova shells and account for the slow rise time to maximum (about one week) of many novae.
Orio Marina
Shaviv Giora
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