Browsing by Subject "Stars:Circumstellar Matter"

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Abundance Analyses of Field RV Tauri Stars. IV. AD Aquilae, DS Aquarii, V360 Cygni, AC Herculis, and V453 Ophiuchi

Giridhar, S; Lambert, D. L; Gonzalez, G (The American Astronomical Society, 1998-12)

Abundance analyses are presented and discussed for five RV Tauri variables. Three stars-DS Aqr, V360 Cyg, and V453 Oph-are RV C stars by spectroscopic classification, i.e., metal lines are weak. They are shown to be metal ...
Late-type giants with infrared excess. I. Lithium abundances

Jasniewicz, G; Parthasarathy, M; de Laverny, P; Thévenin, F (European Southern Observatory, 1999-02)

de la Reza et al. (1997) suggested that all K giants become Li-rich for a short time. During this period the giants are associated with an expanding thin circumstellar shell supposedly triggered by an abrupt internal mixing ...
The ultraviolet variations of the post-AGB star HD 89353

Monier, R; Parthasarathy, M (The European Southern Observatory, 1999-01)

Based on an analysis of all low resolution spectra of HD 89353 (HR 4049) obtained with the International Ultraviolet Explorer (IUE) over several years and uniformly reprocessed, we report on large ultraviolet variations ...

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