The Absolute Magnitude and Kinematics of RR Lyrae Stars via Statistical Parallax
The Absolute Magnitude and Kinematics of RR Lyrae Stars via Statistical Parallax
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DOI：
10.1086/118167
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发表时间：
1996-08
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影响因子：
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通讯作者：
A. Layden;R. Hanson;S. Hawley;A. Klemola;C. J. Hanley
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文献类型：
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作者：
A. Layden;R. Hanson;S. Hawley;A. Klemola;C. J. Hanley
We present new statistical parallax solutions for the absolute magnitude and kinematics of RR Lyrae stars. We have combined new proper motions from the Lick Northern Proper Motion program with new radial velocity and abundance measures to produce a data set that is 50% larger, and of higher quality, than the data sets employed by previous analyses. Based on an a priori kinematic study, we separated the stars into halo and thick disk sub-populations. We performed statistical parallax solutions on these sub-samples, and found MV (RR) = +0.71 ± 0.12 at 〈[Fe/H]〉 = –1.61 for the halo (162 stars), and MV (RR) = +0.79 ± 0.30 at 〈[Fe/H]〉 = –0.76 for the thick disk (51 stars). The solutions yielded a solar motion 〈V 〉 = −210 ± 12 km s−1 and velocity ellipsoid (σU , σV , σW ) = (168 ± 13, 102 ± 8, 97 ± 7) km s −1 for the halo. The values were 〈V 〉 = −48 ± 9 km s−1 and (σU , σV , σW ) = (56 ± 8, 51 ± 8, 31 ± 5) km s −1 for NSF Young Investigator
