Parameters and Abundances in Luminous Stars
Abstract
Parameters and abundances for 451 stars of spectral types F, G, and K of luminosity classes I and II have been derived. Absolute magnitudes and E(B - V) have been derived for the warmer stars in order to investigate the galactic abundance gradient. The value found here: d[Fe/H]/dR ~ -0.06 dex kpc-1, agrees well with previous determinations. Stellar evolution indicators have also been investigated with the derived C/O ratios indicating that standard CN processing has been operating. Perhaps the most surprising result found in these supposedly relatively young intermediate-mass stars is that both [O/Fe] and [C/Fe] show a correlation with [Fe/H] much the same as found in older populations. While the stars were selected based on luminosity class, there does exist a significant [Fe/H] range in the sample. The likely explanation of this is that there is a significant range in age in the sample; that is, some of the sample are low-mass red-giant stars with types that place them within the selection criteria.
- Publication:
-
The Astronomical Journal
- Pub Date:
- June 2014
- DOI:
- 10.1088/0004-6256/147/6/137
- Bibcode:
- 2014AJ....147..137L
- Keywords:
-
- Galaxy: abundances;
- stars: abundances;
- stars: evolution;
- stars: fundamental parameters