经典造父变星，还有什么？
Classical Cepheids, what else?
摘要：
我们提出了新的和独立的估计麦哲伦云（MC）的距离使用近红外（NIR）和光学-NIR周期-Weseneirs（PW）的关系。的PW关系的斜率是，在分散体，线性在整个周期范围内和独立的金属含量。绝对零度点是用银河造父变星固定的，距离是根据红外表面亮度方法确定的。我们发现的大麦云- $(m-M)_0 = 18.48 \pm 0.01 \pm 0.10$等-和小麦哲伦云- $(m-M)_0 = 18.94 \pm 0.01 \pm 0.10$等-的真实距离模数与基于鲁棒距离指标的类似距离测定相当吻合。我们还简要讨论了MC造父变星的演化和脉动性质。
英文摘要：
We present new and independent estimates of the distances to the Magellanic Clouds (MCs) using near-infrared (NIR) and optical--NIR period--Wesenheit (PW) relations. The slopes of the PW relations are, within the dispersion, linear over the entire period range and independent of metal content. The absolute zero points were fixed using Galactic Cepheids with distances based on the infrared surface-brightness method. The true distance modulus we found for the Large Magellanic Cloud---$(m-M)_0 = 18.48 \pm 0.01 \pm 0.10$ mag---and the Small Magellanic Cloud---$(m-M)_0 = 18.94 \pm 0.01 \pm 0.10$ mag---agree quite well with similar distance determinations based on robust distance indicators. We also briefly discuss the evolutionary and pulsation properties of MC Cepheids.
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