Rare thermonuclear explosions in short-period cataclysmic variables, with possible application to the nova-like red variable in the Galaxy M31

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Andromeda Galaxy, Binary Stars, Cataclysmic Variables, Novae, Stellar Mass Accretion, Thermonuclear Explosions, Milky Way Galaxy, Roche Limit, Stellar Luminosity, White Dwarf Stars

Scientific paper

A very bright nova with a peak luminosity significantly larger than the relevant Eddington luminosity might be initiated by a hydrogen shell flash on a very cold low-mass degenerate dwarf accreting matter from a close low-mass companion which fills its Roche lobe in a system with orbital period 80 minutes to 2 hours. Under appropriate conditions, which are calculated, the mass of accreted matter can be as large as 0.005 solar mass when the explosion occurs, and a luminosity larger than the Eddington limit may be generated by the frictional interaction between the matter in a dense common envelope and the interior stellar cores. The frequency of such explosions in our Galaxy may be about six events per millennium. The most likely precursor is a cataclysmic variable with period near 80 minutes, and the final result of the super nova explosion may be dissolution of the low-mass companion into the escaping high-velocity wind. An outburst that was detected in Andromeda in 1988 may be an example.

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