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Astron. Astrophys. 342, 426-439 (1999)

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The origin of carbon, investigated by spectral analysis of solar-type stars in the Galactic Disk *

B. Gustafsson, T. Karlsson, E. Olsson, B. Edvardsson and N. Ryde

Uppsala Astronomical Observatory, Box 515, SE-751 20 Uppsala, Sweden

Received 31 July 1998 / Accepted 21 October 1998

Abstract

Abundance analysis of carbon has been performed in a sample of 80 late F and early G type dwarf stars in the metallicity range [FORMULA] using the forbidden [C I ] line at [FORMULA]. This line is presumably less sensitive to temperature, atmospheric structure and departures from LTE than alternative carbon criteria. We find that [FORMULA] decreases slowly with increasing [FORMULA] with an overall slope of [FORMULA]. 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 [FORMULA] 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

* Based on observations carried out at the European Southern Observatory, La Silla, Chile.

Send offprint requests to: B. Gustafsson (Bengt.Gustafsson@astro.uu.se)

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© European Southern Observatory (ESO) 1999

Online publication: February 22, 1999
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