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Can Evolution in Close Binaries Account for the Blue Stragglers in M67?

Published online by Cambridge University Press:  07 August 2017

Alejandra A. E. Milone ,
David W. Latham ,
Robert D. Mathieu ,
Jon A. Morse  and
Robert J. Davis
Alejandra A. E. Milone
Affiliation:
Harvard-Smithsonian Center for Astrophysics and Córdoba Observatory, National University of Córdoba Laprida 854, 5000 Córdoba, Argentina
David W. Latham
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, Massachusetts 02138, U.S.A.
Robert D. Mathieu
Affiliation:
Department of Astronomy, University of Wisconsin 475 Charter Street, Madison, Wisconsin 53706, U.S.A.
Jon A. Morse
Affiliation:
Department of Physics and Astronomy, University of North Carolina CB #3255, Phillips Hall, Chapel Hill, NC 27599-3255, U.S.A.
Robert J. Davis
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden Street, Cambridge, Massachusetts 02138, U.S.A.

Extract

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For the past 9 years we have been monitoring the radial velocities of 13 blue stragglers in the old open cluster M67. For the 9 blue stragglers with rotational velocities no larger than about 100 km s−1 we have used the CfA digital speedometers to measure more than 500 radial velocities. To get reliable velocity correlations we use synthetic rotating templates computed from a grid of Kurucz model atmospheres. Four of the blue stragglers rotate too rapidly to allow successful velocity correlations with the CfA instruments. For three of these we have used a CCD spectrograph at Kitt Peak and similar reduction procedures (Morse et al. 1991.

Type
Oral and Contributed Papers
Information
Symposium - International Astronomical Union , Volume 151: Evolutionary Processes in Interacting Binary Stars , 1992 , pp. 473 - 474
Copyright
Copyright © Kluwer 1992 

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