关于长周期造父变星S Vulpeculae周期参数的确定
Towards a Determination of Definitive Parameters for the Long Period Cepheid S Vulpeculae
摘要：
造父变星S Vul附近恒星的UBV数据的新汇编结合了APASS和NOMAD的BV观测，以增强先前发表的UBV观测。红化分析产生的平均颜色过剩和距离模量的两个主要群体的恒星在该领域：稀疏集群特纳1和一个匿名的背景组的BA星。前者距离为1.07 ± 0.12 kpc，红化程度为E（B-V）=0.45 ± 0.05，年龄为10^9岁;而先前被忽略的后者距离为3.48 ± 0.19 kpc，红化程度为E（B-V）=0.78 ± 0.02，根据2 MASS的数据也证明了这一点，在假设它属于遥远星群的情况下，对S Vul的参数推断与其他星团造父变星和类造父超巨星的类似结果一致。
英文摘要：
A new compilation of UBV data for stars near the Cepheid S Vul incorporates BV observations from APASS and NOMAD to augment UBV observations published previously. A reddening analysis yields mean colour excesses and distance moduli for two main groups of stars in the field: the sparse cluster Turner 1 and an anonymous background group of BA stars. The former appears to be 1.07+-0.12 kpc distant and reddened by E(B-V)=0.45+-0.05, with an age of 10^9 yrs. The previously overlooked latter group is 3.48+-0.19 kpc distant and reddened by E(B-V)=0.78+-0.02, with an age of 1.3x10^7 yrs. Parameters inferred for S Vul under the assumption that it belongs to the distant group, as also argued by 2MASS data, are all consistent with similar results for other cluster Cepheids and Cepheid-like supergiants.
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