HD 115444 – a barium star of extreme Population II
Open Access
- 1 March 1982
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 198 (3) , 637-658
- https://doi.org/10.1093/mnras/198.3.637
Abstract
The star HD 115444 is shown to be a very metal-poor red giant. A model atmosphere analysis based on colours, energy distributions and moderate-resolution spectrograms has been performed differentially with respect to HD 122563. The following parameters result for HD 115444: Teff = 4800 K, log g = 1.6, M/H = − 2.95, ξt = 2.6 km s−1. The star is therefore one of the most metal-poor stars known to exist. However, its s-element abundances are high relative to iron in comparison with the Sun, and even more so in comparison with other extreme Population II giants. Europium, which is considered to be mainly an r-process element, is also significantly enhanced. The C/Fe ratio seems relatively normal, while N is probably enhanced as it is in HD 122563. Some possible implications of the pattern of abundances in HD 115444 are discussed.Keywords
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