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Title:
The absolute magnitudes of LMC RR Lyrae variables and the ages of Galactic globular clusters
Authors:
Walker, Alistair R.
Affiliation:
AA(Cerro Tololo Inter-American Observatory, La Serena, Chile)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. L81-L84. (ApJL Homepage)
Publication Date:
05/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astrometry, Globular Clusters, Magellanic Clouds, Stellar Magnitude, Variable Stars, Astronomical Photometry, Calibrating, Color-Magnitude Diagram
DOI:
10.1086/186377
Bibliographic Code:
1992ApJ...390L..81W

Abstract

The calibration of metal-poor LMC-cluster RR Lyraes is conducted using a value for the distance to the LMC that is based on more established data. A total of 182 RR Lyrae variables are examined by means of CCD photometry, and the mean magnitude for the variables is 0.44 at Fe/H = -1.9. The value is shown to be brighter than those suggested by statistical parallax analyses of the objects and therefore has important implications for Galactic distances.

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