Multiplicity of chemically peculiar stars

Details Multiplicity of chemically peculiar stars Multiplicity of chemically peculiar stars

2005-10-11

arxiv.org/abs/astro-ph/0510302v1

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, to appear in the Proceedings of the ESO Workshop "Multiple Stars across the H-R Diagram"

Scientific paper

Recently, with the goal to study multiplicity of chemically peculiar stars, we carried out a survey of 40 stars using diffraction limited near infrared (IR) imaging with NAOS-CONICA (NACO) at the VLT. Here, we announce the detection of 27 near IR companion candidates around 25 late B-type chemically peculiar stars exhibiting strong overabundances of the chemical elements Hg and Mn in their atmospheres. A key point for the understanding of the abundance patterns in these stars may be connected with binarity and multiplicity. It is intriguing that more than half of the sample of HgMn stars studied previously by speckle interferometry and recently using the adaptive optics system NACO belong to multiple systems.

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