Isotopic Abundances of Magnesium in the Metal-poor Subgiant nu INDI
Abstract
An isotopic abundance analysis for Mg in the metal-poor subgiant v Indi is reported. A high-resolution, high signal-to-noise spectrum centered near 5131 Å in combination with synthetic spectra gives the ratios 25Mg/24Mg and 26Mg/24Mg < 3%. The 25Mg and 26Mg isotopes are obviously underabundant relative to solar system material, where 25Mg/24Mg = 13% and 26Mg/24Mg = 14%. These results confirm an earlier finding for Gmb 1830, a slightly cooler and more metal-rich dwarf. An elemental abundance analysis is presented for an interesting set of elements: Li, C, O, Mg, Si, Ca, V, Mn, Ti, Fe, Co, Ni, Y, Ba, La, Ce, and Eu. The results show that v Ind is a typical metal-poor subgiant with [Fe/H] = -1.52, and, relative to Fe, a significant overabundance of oxygen ([O/Fe] = +0.52), Mg, Si, and Ca.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1986
- DOI:
- 10.1086/164178
- Bibcode:
- 1986ApJ...304..436L
- Keywords:
-
- Abundance;
- Dwarf Stars;
- Magnesium Isotopes;
- Spectrum Analysis;
- Stellar Spectrophotometry;
- Cool Stars;
- High Resolution;
- Spectral Energy Distribution;
- Spectral Resolution;
- Stellar Atmospheres;
- Subgiant Stars;
- Astrophysics;
- STARS: ABUNDANCES;
- STARS: INDIVIDUAL CONSTELLATION NAME: NU INDI;
- STARS: WEAK-LINE