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The origin of carbon, investigated by spectral analysis of solar-type stars in the Galactic Disk *
B. Edvardsson and
Received 31 July 1998 / Accepted 21 October 1998
Abundance analysis of carbon has been performed in a sample of 80 late F and early G type dwarf stars in the metallicity range using the forbidden [C I ] line at . This line is presumably less sensitive to temperature, atmospheric structure and departures from LTE than alternative carbon criteria. We find that decreases slowly with increasing with an overall slope of . Our results are consistent with carbon enrichment by superwinds of metal-rich massive stars but inconsistent with a main origin of carbon in low-mass stars. This follows in particular from a comparison between the relation of with metallicity for the Galactic stars and the corresponding relation observed for dwarf irregular galaxies. The significance of intermediate-mass stars for the production of carbon in the Galaxy is still somewhat unclear.
Key words: galaxies: evolution Galaxy: abundances stars: abundances nuclear reactions, nucleosynthesis, abundances
Send offprint requests to: B. Gustafsson (Bengt.Gustafsson@astro.uu.se)
Online publication: February 22, 1999