AGB Stars: Testing Carbon Loss Via The Ultraviolet Lines

Details AGB Stars: Testing Carbon Loss Via The Ultraviolet Lines AGB Stars: Testing Carbon Loss Via The Ultraviolet Lines

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...4e...1m&link_type=abstract

The Ultraviolet Universe: Stars from Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August 2006, Prague, Cze

Physics

Scientific paper

A method is proposed to determine the realistic abundances of carbon in planetary nebulae based on the actual distribution functions of errors in measuring line intensities. Fluctuations both in temperature and in mass density in a nebula are taken into account. The C abundances and the amplitudes of temperature and density fluctuations for the large sample of PNe are given. The intensity of the ultraviolet lines of C ions are used for determining the more exact abundances. These abundances are probably the most reliable in the present time and give estimations of the primordial CNO abundances at the epoch when the progenitors of PNs are formed. Basing on the newly carbon abundances the total mass losses of carbon during AGB stage of evolution are estimated.

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