期刊
ASTRONOMY & ASTROPHYSICS
卷 531, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201016382
关键词
stars: variables: Cepheids; distance scale
The metal-poor, fundamental-mode (P0) and first-overtone (P1) Cepheids in the dwarf galaxies IC 1613, WLM, Pegasus, Sextans A, Sextans B, and Leo A are compared with the about equally metal-poor Cepheids of the Small Magellanic Cloud (SMC). The period-color (P-C) and period-luminosity (P-L) relations of the seven galaxies are indistinguishable, but differ distinctly from those in the Large Magellanic Cloud (LMC) and the solar neighborhood. Adopting (m - M)(SMC)(0) = 18.93 from independent evidence, one can determine reliable distance moduli for the other dwarf galaxies of (m - M)(0) = 24.34 +/- 0.03, 24.95 +/- 0.03, 24.87 +/- 0.06, 25.60 +/- 0.03 (mean for Sextans A & B), and 24.59 +/- 0.03, respectively.
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