The reconciliation of several calibrations of the horizontal-branch absolute magnitude as a function of metallicity - A progress report

Details The reconciliation of several calibrations of the horizontal-branch absolute magnitude as a function of metallicity - A progress report The reconciliation of several calibrations of the horizontal-branch absolute magnitude as a function of metallicity - A progress report

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..443c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 2, p. 443-450.

Astronomy and Astrophysics

Astrophysics

11

Calibrating, Horizontal Branch Stars, Metallicity, Stellar Magnitude, Astronomical Models, Milky Way Galaxy, Stellar Evolution, Stellar Models

Scientific paper

A hypothesis that the well-known discrepancies among several calibrations of the absolute magnitude of the horizontal branch (HB) at the color level of the instability strip as a function of metallicity is suggested. The hypothesis takes into account two effects: the significant deviation in luminosity of the RR Lyrae variables from the ZAHB locus at low metallicities and blue HB morphologies; and the observed increase in the HB luminosity thickness delta M(V)(HB) with increasing cluster metallicity. A semiempirical scenario is constructed which suggests that the slope alpha (LE) of the absolute magnitude-metallicity relation is about 0.1 larger than that obtained from an 'evolutionary mean' over the RR Lyrae variables. It is shown that if the hypothesis is correct the age difference between the most metal-poor and the most metal-rich Galactic globular clusters of the halo is probably not significantly greater than about 1-2 Gyr.

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