Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..139s&link_type=abstract
Astronomy and Astrophysics, Vol. 277, NO. 1/SEP(III), P. 139, 1993
Astronomy and Astrophysics
Astrophysics
86
Stars: Abundances - Stars: Chemical Peculiar - Stars: Circumstellar Matter - Stars: Early-Type - Stars: Formation
Scientific paper
Based on high-resolution CCD spectra an abundance analysis of fifteen λ Boo stars has been carried out. Non-LTE effects are taken into account for C, Mg, Al, Ca, Fe, and Ba; they are most pronounced in Al. The sample of stars comprises almost all candidates listed by Gray (1988) and includes two classical λ Boo stars (29 Cyg and π1 Ori) analysed previously by Venn & Lambert (1990). The large metal deficiency derived by these authors is confirmed. However, the entire sample shows a wide range of underabundances extending from these extreme values to almost solar metallicity, and a continuous transition towards normal A stars exists.
The individual abundance patterns of the stars studied are consistent with the model of accretion of depleted gas suggested by Venn & Lambert to explain the severe metal deficiency of classical λ Boo stars, and with the gas-dust separation model proposed by Holweger (1992) to understand the C-Si abundance relation found in main-sequence A stars classified as normal.
Circumstellar lines are detected in a large fraction of the stars. A possible connection to β Pic-type shell stars and & δ Scuti variables is discussed.
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