Are the Luminosities of RR Lyrae Stars Affected by Second Parameter Effects?

Details Are the Luminosities of RR Lyrae Stars Affected by Second Parameter Effects? Are the Luminosities of RR Lyrae Stars Affected by Second Parameter Effects?

1995-09-22

arxiv.org/abs/astro-ph/9509118v1

Astronomy and Astrophysics

Astrophysics

10 pages as uuencoded compressed Postscript. Also available at http://www.dao.nrc.ca/DAO/SCIENCE/science.html

Scientific paper

10.1086/309693

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 second parameters.

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