Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-11-20
Astron.Astrophys.342:426,1999
Astronomy and Astrophysics
Astrophysics
14 pages including 10 Postscript figures, Uses l-aa.sty, Accepted for publication in Astronomy & Astrophysics, Complete Postsc
Scientific paper
Abundance analysis of carbon has been performed in a sample of 80 late F and early G type dwarf stars in the metallicity range -1.06 < [Fe/H] < 0.26 using the forbidden [C I] line at 8727 A. This line is presumably less sensitive to temperature, atmospheric structure and departures from LTE than alternative carbon criteria. We find that [C/Fe] decreases slowly with increasing [Fe/H] with an overall slope of -0.17 +- 0.03. 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 [C/O] 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.
Edvardsson Bengt
Gustafsson Bengt
Karlsson Torgny
Olsson Emma
Ryde Nils
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