HD 172189, a Cluster Member Binary System with a δ Scuti Component in the Field of View of COROT
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- 作者：Pedro J. Amado ; Susana Martín-Ruíz ; Juan Carlos Suárez ; Armando Arellano Ferro ; Andrés Moya ; Ignasi Ribas and Ennio Poretti
- 关键词：Stars ; Binaries ; Eclipsing ; Stars ; Oscillations ; Stars ; Variables ; δ Sct ; Galaxy ; Open clusters ; Association ; IC 4756
- 刊名：Astrophysics and Space Science
- 出版年：2006
- 出版时间：August, 2006
- 年：2006
- 卷：304
- 期：1-4
- 页码：173-175
- 全文大小：518 KB
- 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Astronomy - 出版者：Springer Netherlands
- ISSN：1572-946X
文摘
Photometric and spectroscopic results for the star HD 172189, member of the open cluster IC 4756 in the summer field of the space mission COROT, are presented. From photometric observations in the Str?mgren system carried out at various epochs, its binary nature as well as the presence of a δ Scuti-type pulsating component have been discovered. The frequency analysis of the whole dataset confirms a dominant frequency of 19.5974 c d?1 with a maximum amplitude near 0.02 mag plus other frequencies in the range 18–20 c d?1. A preliminary orbital solution from the light curve and from four FEROS spectra reveals two similar components of around 1.5 M ⊙ orbiting with a period of 5.702 d.