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Issue A&A
Volume 375, Number 2, August IV 2001
Page(s) 375 - 386
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20010589



A&A 375, 375-386 (2001)
DOI: 10.1051/0004-6361:20010589

The blue straggler S 1082: A triple system in the old open cluster M 67

M. van den Berg1, J. Orosz1, F. Verbunt1 and K. Stassun2

1  Astronomical Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands
2  Department of Astronomy, University of Wisconsin-Madison, 475 N Charter St, Madison WI 53706, USA

(Received 7 February 2001 / Accepted 9 March 2001)

Abstract
We present a photometric and spectroscopic study of the blue straggler S 1082 in the open cluster M 67. Our observations confirm the previously reported 1.07 day eclipse light curve and the absence of large radial-velocity variations of the narrow-lined star. However, we find two more spectral components which do vary on the 1.07 day period. We conclude that the system is triple. We fit the light and radial-velocity curves and find that the total mass of the inner binary is more than twice the turnoff mass and that the outer companion to the binary is a blue straggler on its own account. We briefly discuss formation scenarios for this multiple system.


Key words: binaries: eclipsing -- binaries: spectroscopic -- blue stragglers -- stars: individual: S 1082 -- open clusters and associations: individual: M 67

Offprint request: M. van den Berg, m.c.vandenberg@astro.uu.nl

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