Astron. Astrophys. 347, 897-900 (1999)

HR 4657 - evidence for a thick-disk field blue straggler ^*

Klaus Fuhrmann and Jan Bernkopf

Institut für Astronomie und Astrophysik der Universität München, Scheinerstrasse 1, D-81679 München, Germany

Received 8 February 1999 / Accepted 20 May 1999

Abstract

Observational evidence for mass and angular momentum transfer from a companion that is now a white dwarf is presented for the nearby HR 4657 (F5V), a single-lined spectroscopic binary of the Milky Way's thick-disk population. With an orbital period of 850 days the results support the possible importance of long period, low radial velocity amplitude binaries as a viable mechanism, among others, for the blue-straggler phenomenon.

Key words: stars: fundamental parameters stars: individual: HR 4657 stars: blue stragglers stars: white dwarfs

* Based on observations at the German Spanish Astronomical Center, Calar Alto, Spain

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observations and basic atmospheric parameters
• 3. Evidence for a blue straggler
• 4. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: June 6, 1999
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