The mid-infrared period-luminosity relations for the Small Magellanic Cloud Cepheids derived from Spitzer archival data

Chow Choong Ngeow, Shashi M. Kanbur

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20 Scopus citations

Abstract

In this paper, we derive the Spitzer IRAC band period-luminosity (P-L) relations for the Small Magellanic Cloud (SMC) Cepheids, by matching the Spitzer archival SAGE-SMC data with the OGLE-III SMC Cepheids. We find that the 3.6 μm and 4.5 μm band P-L relations can be better described using two P-L relations with a break period at log(P) = 0.4: this is consistent with similar results at optical wavelengths for SMC P-L relations. The 5.8 μm and 8.0 μm band P-L relations do not extend to sufficiently short periods to enable a similar detection of a slope change at log(P) = 0.4. The slopes of the SMC P-L relations, for log(P) > 0.4, are consistent with their Large Magellanic Cloud counterparts that were derived from a similar data set. They are also in agreement with those obtained from a small sample of Galactic Cepheids with parallax measurements.

Original languageEnglish
Pages (from-to)626-631
Number of pages6
JournalAstrophysical Journal
Volume720
Issue number1
DOIs
StatePublished - 1 Sep 2010

Keywords

  • Distance scale
  • Stars: variables: Cepheids

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