Rotational Velocities for Blue Horizontal Branch Stars in Globular Clusters

Details Rotational Velocities for Blue Horizontal Branch Stars in Globular Clusters Rotational Velocities for Blue Horizontal Branch Stars in Globular Clusters

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.5003p&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #50.03; Bulletin of the American Astronomical Society, Vol. 25, p.884

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Rotational velocities v sin i are derived for two dozen stars in each of the globular clusters M3, M13, and NGC 288. Rotation is most prevalent in M13: most stars are rotating more rapidly than 20 \kms, and a half dozen more rapidly than 30 \kms. In M3, only a few are rotating more rapidly than 20 \kms, and none reach this level in NGC 288. We illustrate our method of determining v sin i from fits to a grid of synthetic spectra, present the results for the stars observed in each cluster, and discuss the distribution of v sin i values and their ramifications for stellar evolution and the appearance of the globular-cluster color-magnitude diagram.

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