A comparison of light and velocity variations in semiregular variables

被引：0
|
作者：
Lebzelter, T
Kiss, LL
Hinkle, KH
机构：
[1] Univ Vienna, Inst Astron, A-1180 Vienna, Austria
[2] Univ Szeged, Dept Expt Phys, Szeged, Hungary
[3] Univ Szeged, Astron Observ, Szeged, Hungary
[4] Natl Opt Astron Observ, Natl Solar Observ, Tucson, AZ 85726 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2000年 / 361卷 / 01期
关键词：
stars : variables : general; stars : late-type; stars : AGB and post-AGB; stars : atmospheres;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
NIR velocity variations are compared with simultaneous visual light curves for a sample of late-type semiregular variables (SRV). Precise radial velocity measurements are also presented for the SRV V450 Aql. Our aim is to investigate the nature of the irregular light changes found in these variables. Light and velocity variations are correlated in all stars of our sample. Based on these results we discuss several possibilities to explain the observed behavior. We find that pulsation is responsible for large amplitude variations. In a recent paper Lebzelter (1999) invoked large convective cells to understand observed velocity variations. This possibility is discussed with respect to the observed correlation between light and velocity changes. In the light of these results we investigate the origin of the semiregular variations.
引用
收藏
页码：167 / 174
页数：8
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