The discovery of stellar oscillations in the K giant ι Draconis

被引：21
作者：
Zechmeister, M. [1 ,2 ]
Reffert, S. [3 ]
Hatzes, A. P. [2 ]
Endl, M. [4 ]
Quirrenbach, A. [3 ]
机构：
[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[2] Thuringer Landessternwarte Tautenburg TLS, D-07778 Tautenburg, Germany
[3] Univ Heidelberg, ZAH, Landessternwarte, D-69117 Heidelberg, Germany
[4] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2008年 / 491卷 / 02期
关键词：
stars: individual: iota Draconis; stars: planetary systems; stars: oscillations;
D O I：
10.1051/0004-6361:200810405
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
iota Dra (HIP 75458) is a well-known example of a K giant hosting a substellar companion. We present radial velocity measurements of this star from observations taken with three different instruments spanning nearly 8 years. They show more clearly that the RV period is long-lived and coherent thus supporting the companion hypothesis. The longer time baseline now allows for a more accurate determination of the orbit with a revised period of P = 511 d and an additional small linear trend, indicative of another companion in a wide orbit. Moreover we show that the star exhibits low amplitude, solar-like oscillations with frequencies around 3-4 d(-1) (34.7-46.3 mu Hz).
引用
收藏
页码：531 / 536
页数：6
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