RADIAL VELOCITIES AND PULSATION EPHEMERIDES OF 11 FIELD RR Lyrae STARS

被引:23
|
作者
For, Bi-Qing [1 ]
Preston, George W. [2 ]
Sneden, Christopher [1 ]
机构
[1] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA
[2] Carnegie Observ, Pasadena, CA 91101 USA
来源
基金
美国国家科学基金会;
关键词
stars: horizontal-branch; stars: Population II; stars: variables: RR Lyrae; techniques: radial velocities; HORIZONTAL-BRANCH STARS; CHEMICAL-COMPOSITIONS; GALACTIC FIELD; CATALOG; SEARCH; RED;
D O I
10.1088/0067-0049/194/2/38
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present new radial velocities (RVs), improved pulsation periods, and reference epochs of 11 field RR Lyrae ab-type variables: AS Vir, BS Aps, CD Vel, DT Hya, RV Oct, TY Gru, UV Oct, V1645 Sgr, WY Ant, XZ Aps, and Z Mic. This study is based on high-resolution spectra obtained with the echelle spectrograph of the 2.5 m du Pont telescope at Las Campanas Observatory. We obtained similar to 200 spectra per star (i.e., a total of similar to 2300 spectra), distributed more or less uniformly throughout their pulsation cycles. RV curves and photometric light curves phased to our new ephemerides are presented for all program stars. In a subsequent paper, we will use these spectra to derive stellar atmospheric parameters and chemical compositions throughout the pulsational cycles, based purely on spectroscopic constraints.
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页数:9
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