On the giant, asymptotic and horizontal branches of globular clusters. I - Photographic photometry of M5

Details On the giant, asymptotic and horizontal branches of globular clusters. I - Photographic photometry of M5 On the giant, asymptotic and horizontal branches of globular clusters. I - Photographic photometry of M5

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..435b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, Aug. 1981, p. 435-454. Research supported by the Consiglio Naziona

Astronomy and Astrophysics

Astronomy

97

Astronomical Photography, Giant Stars, Globular Clusters, Horizontal Branch Stars, Stellar Evolution, Stellar Spectrophotometry, Asymptotic Giant Branch Stars, Blue Stars, Color, Color-Magnitude Diagram, Red Giant Stars, Star Distribution, Stellar Luminosity, Stellar Magnitude, Stellar Mass Ejection, Variable Stars

Scientific paper

B, V photographic photometry was obtained for stars in the globular cluster M5, and all stars with B equal to or less than 1.5 and r between 2 and 5.6 arcmin were measured. A reduction procedure was then used that is based on a multicomponent, bidimensional Gaussian fit to the data derived by scanning the plates with a PDS microphotometer. A color-magnitude diagram was then obtained having a photometric accuracy of about 0.04 mag down to a B value of 17.5. It is deduced from this data that: (1) no blue HB stars fainter than a V value of 16.4 is present; (2) the RGB and AGB are clearly separated; and (3) the ratios of the numbers of HB, RGB and AGB stars are in good agreement with the proposed evolutionary model that takes into account semiconvection and mass loss.

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