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

  • Alejandra A. E. Milone (a1), David W. Latham (a2), Robert D. Mathieu (a3), Jon A. Morse (a4) and Robert J. Davis (a2)...

Extract

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.

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References

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Fagerholm, E. 1906, Inaugural Dissertation, Uppsala
Girard, T. M., Grundy, W. M., Lopez, C. E., & van Altena, W. F. 1989, AJ, 98, 227
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Can Evolution in Close Binaries Account for the Blue Stragglers in M67?

  • Alejandra A. E. Milone (a1), David W. Latham (a2), Robert D. Mathieu (a3), Jon A. Morse (a4) and Robert J. Davis (a2)...

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