Ratio of Horizontal Branch Stars to Red Giant Stars in Globular Clusters

Details Ratio of Horizontal Branch Stars to Red Giant Stars in Globular Clusters Ratio of Horizontal Branch Stars to Red Giant Stars in Globular Clusters

Dec 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.224.1006i&link_type=abstract

Nature, Volume 224, Issue 5223, pp. 1006-1008 (1969).

Computer Science

36

Scientific paper

FOR any globular cluster, an observationally estimated number ratio NHB/NRG can be compared with a theoretically estimated lifetime ratio tHB/tRG to obtain an estimate of the initial abundance of helium which characterizes cluster stars. Here NHB is the total number of stars along the horizontal branch and NRG is the number of those stars along the red giant branch that are as bright as or brighter than the horizontal branch at roughly the level of the RR Lyrae stars that lie directly above cluster turnoff. The ratio of relevant lifetimes is a moderately strong function of helium abundance1 that varies2 from about 0.4 when Y (helium abundance by mass) ~0.1 to about 1 when Y ~ 0.3.

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