Binaries among the blue stragglers in M67.
Abstract
The authors have used calculated spectra as templates to derive radial velocities for eleven of the classical blue stragglers in M67 by cross-correlations. The mean velocities for all eleven stars are close to the cluster mean, thus confirming their membership in the cluster. For the blue straggler F190 they derive a spectroscopic orbit with period 4.1829 d, eccentricity 0.21, and mass function 1.6×10-3Msun. Thus F190 is a good candidate for a blue straggler that resulted from mass transfer in a close binary. Several of the other blue stragglers show evidence for low-amplitude velocity variations.
- Publication:
-
The Formation and Evolution of Star Clusters
- Pub Date:
- 1991
- Bibcode:
- 1991ASPC...13..424M
- Keywords:
-
- Binary Stars;
- Blue Stars;
- Early Stars;
- Open Clusters;
- Cross Correlation;
- Radial Velocity;
- Stellar Mass Accretion;
- Stellar Orbits;
- Stellar Rotation;
- Astrophysics;
- Globular Clusters: Blue Stragglers;
- Globular Clusters: Spectroscopic Binaries