The galactic globular cluster system - Calibration of the ratio R = N(HB)/N(RGB)

Details The galactic globular cluster system - Calibration of the ratio R = N(HB)/N(RGB) The galactic globular cluster system - Calibration of the ratio R = N(HB)/N(RGB)

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..228c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 228-233.

Statistics

Computation

65

Abundance, Calibrating, Computational Astrophysics, Galactic Clusters, Globular Clusters, Helium, Hertzsprung-Russell Diagram, Stellar Models, Stellar Spectrophotometry, Variable Stars

Scientific paper

On the basis of Synthetic Horizontal Branches computed with Sweigart and Gross (1976) Horizontal Branch evolutionary tracks, and by means of Sweigart and Gross (1978) Red Giant Branch star models, the calibration of the ratio R = N(HB)/N(RGB) in terms of helium abundance (Y), He-core mass (Mc) and Horizontal Branch morphology is derived. The results obtained in the present paper confirm that the estimate for Y is independent of the Horizontal Branch morphology, at least within the observed range of R-values and for clusters containing RR Lyrae variables. As far as the occurrence of enhanced He-core mass is concerned, the resulting estimate for Y increases by dY/dΔMc = 0.40. From star counts in some well studied RR Lyrae rich globular clusters a mean value for Y equal to 0.24±0.01 is obtained.

Affiliated with

Also associated with

No associations

Rating

The galactic globular cluster system - Calibration of the ratio R = N(HB)/N(RGB) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The galactic globular cluster system - Calibration of the ratio R = N(HB)/N(RGB), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The galactic globular cluster system - Calibration of the ratio R = N(HB)/N(RGB) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1667922