Light-element abundances in 20 F and G dwarfs.
Abstract
Red and near-IR spectral lines of the Galaxy are analyzed to extract Na, Mg, Al, Si and Ca abundances. The data were obtained using a 2.7 m telescope fitted with a coudespectrograph and a Reticon photodiode array tuned to the 6160, 6350, 6570, 6696, 7860 and 8740 wavelengths of 20 F and G dwarfs in the disk and halo. The abundances were then compared to recorded Fe abundances, particularly the forbidden Fe/H ratio. Even numbered atomic number elemental abundances followed the ratio down to values of -0.4, then increased relative to Fe in the transition from disk to halo. The abundances of odd-numbered elements more closely tracked the abundance of Mg in the disk, and experienced a fairly abrupt decrease in the disk-halo transition.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1985
- DOI:
- 10.1086/162984
- Bibcode:
- 1985ApJ...290..289T
- Keywords:
-
- Abundance;
- Dwarf Stars;
- F Stars;
- G Stars;
- Infrared Spectra;
- Light Elements;
- Near Infrared Radiation;
- Stellar Composition;
- Atomic Spectra;
- High Resolution;
- Line Spectra;
- Nuclear Fusion;
- Spectral Line Width;
- Spectrum Analysis;
- Stellar Structure;
- Temperature Dependence;
- Astrophysics