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Title: The Chemical Compositions of the SRD Variable Stars. II. WY Andromedae, VW Eridani, and UW Librae
Authors: Giridhar, S
Lambert, D. L
Gonzalez, G
Keywords: Stars: abundances;Stars: agb and post-agb;Stars: variables
Issue Date: Oct-1999
Publisher: The Astronomical Society of the Pacific
Citation: The Publications of the Astronomical Society of the Pacific, Vol. 111, No. 764, pp. 1269 - 1274
Abstract: Chemical compositions are derived from high-resolution spectra for three stars classed as SRd variables in the General Catalogue of Variable Stars. These stars are shown to be metal-poor supergiants: WY And with [Fe/H]=-1.0, VW Eri with [Fe/H]=-1.8, and UW Lib with [Fe/H]=-1.2. Their compositions are identical to within the measurement errors to the compositions of subdwarfs, subgiants, and less evolved giants of the same [Fe/H]. The stars are at the tip of the first giant branch or in the early stages of evolution along the asymptotic giant branch (AGB). There is no convincing evidence that these SRd variables are experiencing thermal pulsing and the third dredge-up on the AGB. The SRd variables appear to be at the cool limit of the sequence of RV Tauri variables.
ISSN: 0004-6280
Appears in Collections:IIAP Publications

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