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

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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


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 [FORMULA]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

© European Southern Observatory (ESO) 1999

Online publication: June 6, 1999