Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..480f&link_type=abstract
Astrophysical Journal v.351, p.480
Astronomy and Astrophysics
Astronomy
46
Clusters: Open, Stars: Abundances, Stars: Atmospheres
Scientific paper
We have determined carbon abundances for F dwarfs in open clusters and moving groups of a variety of ages and [Fe/H] abundances to investigate the homogeneity of chemical mixing within the Galactic disk. The stars studied range in age from 5 × 107 to 2 × 109 years, and in metallicity from [Fe/H] = -0.2 to +0.15; our sample of F dwarfs comes from the α Per, Pleiades, and Hyades clusters, and the UMa, Hyades, and Wolf 630 moving groups, as well as a selection of bright field F dwarfs.
Carbon abundances were determined from high-excitation C I lines near 7110 and 6590 Å measured in high-resolution, high signal-to-noise coudé spectra. Observations were obtained with both the CFHT Reticon at a spectral resolution of 0.11 Å and the Palomar 200 inch (5.1 m) TI CCD with a resolution of 0.21 Å. Stellar carbon abundances determined from a model atmosphere analysis are estimated to be accurate to 0.08 dex.
We find that the observed dispersion about the mean cluster carbon abundances is consistent with observational error alone, and we conclude that the intrinsic dispersion in the carbon abundances in each cluster or group is extremely small, probably less than ˜0.05 dex. We also find that, to within the observational error, [C/Fe] = 0.0 for all clusters and groups, with an observed dispersion of only 0.09 dex over the entire sample of 69 stars.
There is no evidence for a trend of [C/H] with age for these young stellar groups, but there are real cluster-to-cluster variations, implying differences in the C content in the precluster gas. The [C/H] cluster differences follow the same pattern as the [Fe/H] cluster differences and yield [C/Fe] values which are constant, and equal to the solar value, in all the groups. Thus in agreement with previous studies of field dwarfs, there is no trend of carbon-to-iron ratio with metallicity These data indicate that the production of carbon in the Galactic disk over the last ˜1 billion years has kept pace, to an extremely high degree, with the production of iron.
Boesgaard Ann Merchant
Friel Eileen D.
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