PERIOD-LUMINOSITY RELATIONS DERIVED from the OGLE-III FUNDAMENTAL MODE CEPHEIDS. II. the SMALL MAGELLANIC CLOUD CEPHEIDS

Chow Choong Ngeow, Shashi M. Kanbur, Anupam Bhardwaj, Harinder P. Singh

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Abstract

In this paper we present multi-band period-luminosity (P-L) relations for fundamental mode Cepheids in the SMC. The optical VI-band mean magnitudes for these SMC Cepheids were taken from the third phase of the Optical Gravitational Lensing Experiment (OGLE-III) catalog. We also matched the OGLE-III SMC Cepheids to 2MASS and SAGE-SMC catalog to derive mean magnitudes in the JHK-bands and the four Spitzer IRAC bands, respectively. All photometry was corrected for extinction by adopting Zaritsky's extinction map. Cepheids with periods smaller than ∼2.5 days were removed from the sample. In addition to the extinction corrected P-L relations in nine filters from optical to infrared, we also derived the extinction-free Wesenheit function for these Cepheids. We tested the nonlinearity of these SMC P-L relations (except the -band P-L relation) at 10 days: none of the P-L relations show statistically significant evidence of nonlinearity. When compared to the P-L relations in the LMC, the t-test results revealed that there is a difference between the SMC/LMC P-L slopes only in the V- and J-band. Further, we found excellent agreement between the SMC/LMC Wesenheit P-L slope. The difference in LMC and SMC Period-Wesenheit relation LMC and SMC zero points was found to be mag. This amounts to a difference in distance modulus between the LMC and SMC.

Original languageEnglish
Article number67
JournalAstrophysical Journal
Volume808
Issue number1
DOIs
StatePublished - 20 Jul 2015

Keywords

  • Magellanic Clouds
  • distance scale
  • stars: variables: Cepheids

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