The chemical composition of the RV Tauri variable IW Carinae

Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/2636

Title:	The chemical composition of the RV Tauri variable IW Carinae
Authors:	Giridhar, S Kameswara Rao, N Lambert, D. L
Keywords:	Abundance Atomic Spectra Carbon Line Spectra Stellar Composition Stellar Spectra Supergiant Stars Variable Stars Astronomical Catalogs Astronomical Spectroscopy H Alpha Line Nuclear Fusion Photosphere Visible Spectrum
Issue Date:	Dec-1994
Publisher:	The American Astronomical Society
Citation:	Astrophysical Journal, Part 1, Vol. 437, No. 1, pp. 476 - 484
Abstract:	Analysis of the RV Tauri star IW Carinae shows a photospheric composition unlike that reported previously for a few other RV Tau stars but resembling that of certain post-asymptotic giant branch stars (post-AGB) stars. IW Car is carbon-rich: several lines of C I are detected and suggest C/O greater than or = 1. The star is generally metal poor. The composition of (Fe/H) approximately -1.0, (Ca/H) approximately = -1.9 but (Zn/H) approximately 0.0 reflects that of gas of solar metallicity from which easily condensable elements have condensed into dust grains and been removed from the star's photosphere. Separation of gas and dust may have occurred in the present or recent stellar wind of IW Car. These characteristics also suggest that RV Tauri stars are post-AGB objects.
URI:	http://hdl.handle.net/2248/2636
ISSN:	0004-637X
Appears in Collections:	IIAP Publications

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