Bright Stars in the Galactic Globular M5

Details Bright Stars in the Galactic Globular M5 Bright Stars in the Galactic Globular M5

1994-07-07

arxiv.org/abs/astro-ph/9407022v1

Astron.J. 109 (1995) 1670-1675

Astronomy and Astrophysics

Astrophysics

16 pages, Standard TeX, 4 figures available upon request from brocato@astrte.te.astro.it

Scientific paper

10.1086/117394

We present a CCD investigation of the galactic globular M5 aimed to increase the statistical relevance of the available sample of evolving bright stars. Previous investigations, limited to the outer cluster region, have been extended toward the cluster center, more than doubling the number of observed luminous stars. On this basis, we discuss a statistically relevant sample, rich of 415 HB stars. The occurrence of a gap in the blue side of the HB is suggested. Comparison to the current evolutionary scenario discloses a good agreement concerning both the C-M diagram location and the relative abundance of stars in the advanced evolutionary phases, supporting our present knowledge of the evolution of low mass stars. Determination of the amount of the original helium content through the ratio R N(HB)/N(RGB) gives $Y = 0.22 \pm 0.02$.

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