The blue horizontal branch of the globular cluster M15 Photographic photometry with the GALAXY machine

Details The blue horizontal branch of the globular cluster M15 Photographic photometry with the GALAXY machine The blue horizontal branch of the globular cluster M15 Photographic photometry with the GALAXY machine

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26as...61..487b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 61, Sept. 1985, p. 487-501. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

19

Astronomical Photography, Blue Stars, Globular Clusters, Horizontal Branch Stars, Stellar Spectrophotometry, Asymptotic Giant Branch Stars, Data Reduction, Stellar Color, Stellar Magnitude

Scientific paper

Photographic observations of 295 stars in the globular cluster M15 are reported. The photographic plates were analyzed using the GALAXY machine attached to the 152-cm Ritchey-Chretien F/8 telescope of the University of Bologna at Loiano, Italy. B and V plates for a region having a distance from the center greater than 5.0 arcmin and less than 12.0 arcmin. On the basis of an analysis of the entire sample, the presence of a gap in the horizontal branch was confirmed. The ratio of the populations of stars in the three main branches (RGB, AGB, and HB) was constant within an acceptable range of error over the entire cluster. The ratios of populations among the bluer stars suggested a possible radial trend. The magnitudes, positions, and colors of the stars are given in a table.

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