On transient thermal X-ray emission from novae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Novae, Stellar Envelopes, Stellar Models, Thermal Emission, X Ray Sources, Energy Conversion Efficiency, Interstellar Matter, Light Curve, Mass Transfer, Stellar Mass Ejection, Transient Response

Scientific paper

The motion of an ejected nova shell through circumstellar matter is considered as a mechanism for thermal X-ray continuum production. Assuming that a nova system is fueled by steady mass transfer and that circumstellar matter is built up at a given rate, calculations are performed for two simplified alternatives for the circumstellar matter distribution at distances that are large in comparison with the orbital radius. The X-ray production efficiency is estimated, an expression is obtained for the expected X-ray light curve, and it is shown that an expanding nova shell can generate a circumstellar X-ray power that is large enough to be potentially relevant to the transient source A0620-00. The results are compared with observations of Nova Cygni 1975 and A0620-00; it is concluded that recurrent novae are the most likely X-ray source candidates among novae.

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