期刊
ASTRONOMICAL JOURNAL
卷 138, 期 6, 页码 1661-1666出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/138/6/1661
关键词
distance scale; galaxies: distances and redshifts; galaxies: individual (SMC); infrared: stars; stars: individual (RR Lyrae)
资金
- Chilean Center for Astrophysics FONDAP [15010003]
- BASAL Center for Astrophysics and Related Technologies [CATA 2007 PFB 06]
- Polish [N203 002 31/046]
- FOCUS subsidy of the Foundation for Polish Science (FNP)
We have obtained deep infrared J-and K-band observations of nine 4.9 x 4.9 arcmin fields in the Small Magellanic Cloud (SMC) with the ESO New Technology Telescope equipped with the SOFI infrared camera. In these fields, 34 RR Lyrae stars cataloged by the OGLE collaboration were identified. Using different theoretical and empirical calibrations of the infrared period-luminosity-metallicity relation, we find consistent SMC distance moduli, and find a best true distance modulus to the SMC of 18.97 +/- 0.03 (statistical) +/- 0.12 (systematic) mag, which agrees well with most independent distance determinations to this galaxy, and puts the SMC 0.39 mag more distant than the Large Magellanic Cloud for which our group has recently derived, from the same technique, a distance of 18.58 mag.
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