Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..436l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 1, 1986, p. 436-442. Research supported by the Robert A. Welch Fou
Astronomy and Astrophysics
Astrophysics
24
Abundance, Dwarf Stars, Magnesium Isotopes, Spectrum Analysis, Stellar Spectrophotometry, Cool Stars, High Resolution, Spectral Energy Distribution, Spectral Resolution, Stellar Atmospheres, Subgiant Stars
Scientific paper
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.
Lambert David L.
McWilliam Andrew
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