Other
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..237p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 1, 1984, p. 237-251.
Other
58
Binary Stars, Blue Stars, Star Clusters, Stellar Evolution, Stellar Spectra, Stellar Spectrophotometry, Astronomical Photometry, Eccentric Orbits, Main Sequence Stars, Mass Transfer, Open Clusters, Radial Velocity, Stellar Rotation
Scientific paper
Photometry and echelle spectroscopy are used to show that at least two, and probably all, of the five brightest blue stragglers in the open cluster M67 are binaries. One of the stars, F190, has radial velocity variations with an amplitude of 30 km/s or more. The average velocities for F156 and F280 depart by 5-7 km/s from the cluster mean, which is more than twice the 1 sigma uncertainty in each determination. The rotational velocity values range from less than 10 to 120 km/s, somewhat lower than average for stars of this temperature in other, necessarily younger, open clusters. These results constitute strong support for the hypothesis that stragglers owe their current existence beyond the main sequence turnoff to mass transfer from an evolving companion. Previous observations are discussed which suggest that the scarcity of stragglers in globular clusters is due to the ease of disruption of the widely separated components of the progenitor systems.
Carney Bruce W.
Latham Dave W.
Peterson Ruth C.
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