Abundance analysis of SB2 binary stars with HgMn primaries

Details Abundance analysis of SB2 binary stars with HgMn primaries Abundance analysis of SB2 binary stars with HgMn primaries

1998-05-06

arxiv.org/abs/astro-ph/9805063v1

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, to appear in: Proc. of the 26th workshop of the European Working Group on CP stars, eds. P. North, A. Schne

Scientific paper

We present a short review of the abundances in the atmospheres of SB2 systems with Mercury-Manganese (HgMn) primaries. Up to now a careful study has been made for both components of 8 out of 17 known SB2 binaries with orbital periods shorter than 100 days and mass ratio ranging from 1.08 to 2.2. For all eight systems we observe a lower Mn abundance in the secondary's atmospheres than in the primary's. Significant difference in the abundances is also found for some peculiar elements such as Ga, Xe, Pt. All secondary stars with effective temperatures less than 10000 K show abundance characteristics typical of the metallic-line stars.

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