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The Araucaria Project: The Distance to the Small Magellanic Cloud from Near Infrared Photometry of Type II Cepheids

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Ciechanowska A. , Pietrzyński G. , Szewczyk O. , Gieren W. , Soszyński I.

Acta Astronomica

2010

tom Vol. 60, No. 3

233--243

We have obtained deep near infrared J- and K-band observations of 14 BL Her and 5 W Vir SMC stars from the OGLE-III survey with the ESO New Technology Telescope equipped with the SOFI infrared camera. From these observations, period-luminosity (P-L) relations in the J and Ks 2MASS bands were derived. The slopes of the K- and J-band relations of -2.15±0.19 and -1.95±0.24, respectively, agree very well with the corresponding slopes derived previously for population II Cepheids in globular clusters, Galactic bulge and in the Large Magellanic Cloud. The distance modulus to the SMC obtained from our data using P-L relation derived for globular cluster Cepheids equals to 18.85±0.07 (statistical) ± 0.07 mag (systematic without including potential metallicity effect), which within the uncertainties agrees well with the results obtained with other methods.