The absolute magnitudes of RR Lyrae stars and the age of the galactic globular cluster system

Details The absolute magnitudes of RR Lyrae stars and the age of the galactic globular cluster system The absolute magnitudes of RR Lyrae stars and the age of the galactic globular cluster system

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..645s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. 645-661.

Astronomy and Astrophysics

Astrophysics

187

Cepheid Variables, Globular Clusters, Stellar Evolution, Stellar Magnitude, Abundance, Astronomical Photometry, Color-Magnitude Diagram, Horizontal Branch Stars, Main Sequence Stars, Metallicity, Stellar Luminosity

Scientific paper

Evidence is adduced that many calibrations of the absolute luminosities of zero-age horizontal-branch RR Lyrae stars exhibit a dependence on metallicity. The primary unsolved problem is now why the various RR Lyrae absolute magnitude calibrations yield such different slope dependencies on metallicities. The ages of the globular clusters can, nevertheless, be determined independently of the calibration of RR Lyrae absolute luminosities, by relying on the main-sequence fits to directly ascertain bolometric magnitudes.

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