Volume 519, September 2010
|Number of page(s)||5|
|Published online||15 September 2010|
Chemical composition of semi-regular variable giants. II.*
Department of Astronomy and Astronomical Observatory, Odessa National
University, T.G. Shevchenko Park, 65014 Odessa, Ukraine, and Isaac Newton Institute
of Chile, Odessa Branch, Ukraine e-mail: email@example.com; firstname.lastname@example.org; email@example.com
2 GEPI, Observatoire de Paris-Meudon, 92125 Meudon Cedex, France
3 WIYN Observatory, 950 N. Cherry Ave. Tucson, AZ 85719, USA e-mail: firstname.lastname@example.org
Accepted: 5 July 2010
Aims. The aim of this work was to derive the elemental abundances in four stars classified as semiregular variables of the type “d” (SRd). These stars should presumably belong to the Galactic halo population.
Methods. Elemental abundances have been derived from both local thermodynamical equilibrium (LTE) and non-local thermodynamical equilibrium (NLTE) analyses, applied to high-resolution (R ≅ 80 000) spectra obtained with the CFHT ESPaDOnS spectrograph.
Results. We have derived the abundances of 29 chemical elements in V463 Her, V894 Her, CW CVn, and MS Hya, and arrived at the following conclusions.
Conclusions. The stars of our programme have a chemical composition that does not agree with their presumable status as metal-deficient halo giants. All studied SRd giants have relative-to-solar elemental abundances typical of the thick/thin Galactic disc stars.
Key words: stars: variables: general / stars: abundances
© ESO, 2010
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