The discovery of stellar oscillations in the K giant ι Draconis

被引：22

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

页码：531 / 536

页数：6

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