Period-color and amplitude-color relations in classical Cepheid variables

Details Period-color and amplitude-color relations in classical Cepheid variables Period-color and amplitude-color relations in classical Cepheid variables

2004-02-06

arxiv.org/abs/astro-ph/0402145v1

Mon.Not.Roy.Astron.Soc. 350 (2004) 962

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures and 5 tables. MNRAS accepted

Scientific paper

10.1111/j.1365-2966.2004.07707.x

In this paper we analyze the behavior of Galactic, LMC and SMC Cepheids in terms of period-color (PC) and amplitude-color (AC) diagrams at the phases of maximum, mean and minimum light. We find very different behavior between Galactic and Magellanic Cloud Cepheids. Motivated by the recent report of a break in LMC PC relations at 10 days (Tammann et al. 2002), we use the F-statistical test to examine the PC relations at mean light in these three galaxies. The results of the F-test support the existence of the a break in the LMC PC(mean) relation, but not in the Galactic or SMC PC(mean) relations. Furthermore, the LMC Cepheids also show a break at minimum light, which is not seen in the Galactic and SMC Cepheids. We further discuss the effect on the period-luminosity relations in the LMC due to the break in the PC(mean) relation.

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