Chemical abundances of Galactic cepheid variables that calibrate the P-L relation

被引：88
作者：
Fry, AM
Carney, BW
机构：
[1] Department of Physics and Astronomy, Univ. of N. Carolina at Chapel Hill, Chapel Hill
来源：
ASTRONOMICAL JOURNAL | 1997年 / 113卷 / 03期
关键词：
D O I：
10.1086/118324
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have completed spectroscopic studies of 23 Galactic cepheids to determine possible metallicity effects on measuring the zero point of the P-L relation. We find a spread of 0.4 dex in [Fe/H], which is not the result of either observational scatter or of a metallicity gradient within the Galactic disk. We find a smaller, less significant spread of 0.2 dex in II [alpha/Fe]. Our results are robust, determined by constancy of [Fe/H] derived at differing temperatures throughout the pulsational cycle, and abundances of two dwarfs compared to U Sgr in the cluster M25. We discuss briefly the effect of metallicity on the P-L relation. We also EV Set and QZ Nor are overtone pulsators, and that the latter is not a member of the cluster NGC 6067. (C) 1997 American Astronomical Society.
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页码：1073 / 1087
页数：15
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