SIMBAD references

2002A&A...381..959H - Astronomy and Astrophysics, volume 381, 959-970 (2002/1-3)

The abundance pattern of λ Bootis stars.

HEITER U.

Abstract (from CDS):

Within a project to investigate the properties of λ Bootis stars, we report on their abundance pattern. High resolution spectra have been obtained for a total of twelve candidate λ Bootis stars, four of them being contained in spectroscopic binary systems, and detailed abundance analyses have been performed. All program stars show a characteristic λ Bootis abundance pattern (deficient heavy elements and solar abundant light elements) and an enhanced abundance of Na. This work raises the fraction of λ Bootis stars with known abundances to 50%. The resulting abundances complemented by literature data are used to construct a ``mean λ Bootis abundance pattern'', which exhibits, apart from general underabundances of heavy elements (≃-1dex) and solar abundances of C, N, O, Na and S, a star-to-star scatter which is up to twice as large as for a comparable sample of normal stars.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - binaries: spectroscopic - stars: chemically peculiar - stars: early-type

Simbad objects: 38

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