Chemical composition of semi-regular variable giants. II.

Details Chemical composition of semi-regular variable giants. II. Chemical composition of semi-regular variable giants. II.

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...519a..74b&link_type=abstract

Astronomy and Astrophysics, Volume 519, id.A74

Astronomy and Astrophysics

Astrophysics

Stars: Variables: General, Stars: Abundances

Scientific paper

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.
Based on observations obtained at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii.

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