RR Lyraes and Type II Cepheids in the Magellanic Clouds: Distance Scales and Population Gradients

Details RR Lyraes and Type II Cepheids in the Magellanic Clouds: Distance Scales and Population Gradients RR Lyraes and Type II Cepheids in the Magellanic Clouds: Distance Scales and Population Gradients

2011-06-07

arxiv.org/abs/1106.1449v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 3 figures, 4 tables; to appear in the Carnegie Observatories Astrophysics Series, Volume 5

Scientific paper

This paper discusses the current uncertainties in luminosity calibration of the RR Lyrae variables. The difference in distance moduli between the SMC and LMC as derived from RR Lyrae stars and classical Cepheids is used to estimate a metallicity effect on the Cepheid PL(VI) relation of 0.29+-0.11 mag/dex. There is evidence that suggests RR Lyrae variables and type II Cepheids share a common K-log(P) relation. Metallicity and age gradients in the LMC are discussed from data on RR Lyrae variables and AGB stars.

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