New period-luminosity and period-color relations of classical Cepheids - IV. The low-metallicity galaxies IC?1613, WLM, Pegasus, Sextans A and B, and Leo A in comparison to SMC

摘要

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 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.