Globular Cluster Red Giants as a Probe of Horizontal Branch Luminosities

Details Globular Cluster Red Giants as a Probe of Horizontal Branch Luminosities Globular Cluster Red Giants as a Probe of Horizontal Branch Luminosities

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272..442c&link_type=abstract

Astronomy and Astrophysics, Vol.272, NO. 2/MAYII, P. 442, 1993

Astronomy and Astrophysics

Astrophysics

12

Stars: Giant, Stars: Luminosity Of, Stars: Rr Lyrae

Scientific paper

Connecting observational data to recent theoretical prescriptions for the luminosity of RR Lyrae, we present a new estimate of the bolometric magnitude of the first brightest red giant for a selected sample of galactic globular clusters. Comparison with theoretical prescriptions for the red giant luminosity at the He-flash discloses an excellent agreement. We also investigate the consistency of the non-canonical scenario for the luminosity of RR Lyrae suggested by Sandage, implying either an anticorrelation between Y and Z or nonstandard values for the RG core masses. We show that both these possibilities disagree with observational data producing a non-consistent scenario.

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