论文标题
头孢虫的脉动模式对金属性的脉动模式
Dependence of pulsation mode of Cepheids on metallicity
论文作者
论文摘要
SMC，LMC，银河系，M33和M31中的头孢虫变量用于检查脉动模式对金属性的依赖性，该金属性先前在红色超级巨人中发现。头孢虫的初始样品是从Ogle，PS1，Direct，Wice和ZTF调查中鉴定出的头目目录中收集的。借助GAIA/EDR3星形信息以额外的星系或比较银河系的几何距离以及与P-L关系的距离，从而去除污染物。根据每个星系中对象的p-l图中的两个模式之间的差距，对基本模式的分裂进行了完善。发现SMC，LMC，银河系，M33和M31的Fu/（Fu+1o）的比率分别为0.59、0.60、0.69、0.83和0.85，按金属性顺序分别为M33和M31，这证实了脉冲模式取决于金属的脉冲模式，而fu/（fu/（fu/（fu/（fu/）的比率）增加了fu/（fu/（fu/（fu/（fu/）的比率）。如果考虑样品的不完整性，则不会更改此依赖性。
The Cepheid variables in SMC, LMC, the Milky Way, M33 and M31 are used to examine the dependence of pulsation mode on metallicity which was previously found in red supergiants. The initial samples of Cepheids are collected from the Cepheid catalogs identified from the OGLE, PS1, DIRECT, WISE and ZTF surveys. The contaminants are removed with the help of the Gaia/EDR3 astrometric information for extra galaxies or by comparing the geometric distance and the distance from the P-L relation for the Milky Way. The division of fundamental and first-overtone mode is refined according to the gap between the two modes in the P-L diagram of the objects in each galaxy. The ratio of FU/(FU+1O) is found to be 0.59, 0.60, 0.69, 0.83 and 0.85 for SMC, LMC, the Milky Way, M33 and M31 respectively in order of metallicity, which confirms that the pulsation mode depends on metallicity in the way that the ratio of FU/(FU+1O) increases with metallicity. This dependence is not changed if the incompleteness of the samples is taken into account.
