Are the Luminosities of RR Lyrae Stars Affected by Second Parameter Effects?
Open Access
- 1 October 1995
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 451 (2) , L65
- https://doi.org/10.1086/309693
Abstract
There is a serious discrepancy between the distance to the LMC derived from the Cepheid Period-Luminosity relation and that obtained by using the Galactic calibration for the luminosity of RR Lyrae stars. It is suggested that this problem might be due to the fact that second parameter effects make it inappropriate to apply Galactic calibrations to RR Lyrae variables in the Magellanic Clouds, i.e., MV (RR) could depend on both [Fe/H] and on one or more other parameters.Keywords
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