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Spectroscopic Binaries in the Open Cluster M67

Published online by Cambridge University Press:  12 April 2016

David W. Latham ,
Robert D. Mathieu ,
Alejandra A.E. Milone  and
Robert J. Davis
David W. Latham
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Robert D. Mathieu
Affiliation:
Department of Astronomy, University of Wisconsin, 475 Charter Street, Madison, WI 53706, USA
Alejandra A.E. Milone
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA and Cördoba Observatory, National University of Cördoba, Laprida 854, 5000 Cördoba, Argentina
Robert J. Davis
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA

Abstract

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For almost 400 members of M67 we have accumulated about 5,000 precise radial velocities. Already we have orbital solutions for more than 32 spectroscopic binaries in M67. Many of these orbits were derived by combining the Palomar and CfA observations, thus extending the time coverage to more than 20 years. The distribution of eccentricity versus period shows evidence for tidal circularization on the main sequence. The transition from circular orbits is fairly clean. Excluding the blue stragglers, the first eccentric orbit has a period of 11.0 days, while the last circular orbit has a period of 12.4 days. For longer periods the distribution of eccentricity is the same as for field stars. The blue straggler S1284 has an eccentric orbit despite its short period of 4.2 days.

Type
Spectroscopic Studies
Information
International Astronomical Union Colloquium , Volume 135: Complementary Approaches to Double and Multiple Star Research , 1992 , pp. 155 - 157
Copyright
Copyright © Astronomical Society of the Pacific 1992

References

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