Production of radioactive nuclei and detectability of gamma-ray lines from nova outbursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Supernova Remnants, Gamma Ray Spectra, Heao 3, White Dwarf Stars, Radioactive Isotopes, Carbon Isotopes, Nitrogen Isotopes, Oxygen Isotopes, Magnesium Isotopes, Aluminum Isotopes

Scientific paper

We report the results of nucleosynthesis calculations of thermonuclear burning in hydrogen-rich matter under conditions typical of the envelopes of novae occurring on CO white dwarfs. It is shown that substantial abundances of Ne-22 and Mg-25 in CO cores do not lead to the production of an appreciable amount of radioactive Na-22 in the ejected material, but they result in a significant increase in (Al-22)g concentration. A simple graphical method for assessing the detectability of gamma-ray line fluxes from radioactive nuclei formed in large quantities during nova outbursts is proposed. For nearby novae with fairly high CNO abundances in their envelopes before an outburst, gamma-ray radiation in the annihilation line is shown to be observable.

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