Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981japa....2..215s&link_type=abstract
Journal of Astrophysics and Astronomy, vol. 2, Sept. 1981, p. 215-244.
Astronomy and Astrophysics
Astronomy
12
Blue Stars, Globular Clusters, Horizontal Branch Stars, Infrared Astronomy, Star Distribution, Stellar Mass, Abundance, Brightness Distribution, Electrophotometers, Instrument Errors, Stellar Magnitude, Stellar Rotation
Scientific paper
Photoelectric and photographic techniques are used to study the color changes indicative of segregation effects over the cluster omega-Cen and 47 Tuc. It is established that omega Cen is bluer between 2 arcmin and 4 arcmin from the center, than anywhere else, the B-I color difference between the center and this blue zone being equal to about 0.45 mag. Equidensitometry of omega-Cen in B, V, and infrared bands indicates a wavelength dependence, with the cluster nearly spherical in the infrared band. The blue in this zone comes from both a diffuse background of unresolved stars and an increase in the relative abundance of horizontal branch stars. Results of equidensitometry of the cluster 47 Tuc show that ellipticity is increased with an increase in the blueness of the cluster, and is dependent on the distance from the center. It is suggested that, compared to the nearly spherical distribution of red stars in globular clusters, blue stars form a bulge around the core with a more elliptical distribution and a different orientation.
Scaria K. K.
Vainu Bappu M. K.
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