Is There Plenty of Metal-poor Stars with Planets in the Galactic Thick Disk?

被引：0
|
作者：
Adibekyan, V. Zh [1 ]
Santos, N. C. [1 ,2 ]
Sousa, S. G. [1 ,3 ]
Israelian, G. [3 ,4 ]
Figueira, P. [1 ]
机构：
[1] Univ Porto, Ctr Astrofis, Rua Estrelas, P-4150762 Oporto, Portugal
[2] Univ Porto, Dept Fis & Astron, Fac Ciencias, Oporto, Portugal
[3] Inst Astrofis Canarias, Tenerife 38200, Spain
[4] Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain
来源：
NEW QUESTS IN STELLAR ASTROPHYSICS III: A PANCHROMATIC VIEW OF SOLAR-LIKE STARS, WITH AND WITHOUT PLANETS | 2013年 / 472卷
基金：
欧洲研究理事会;
关键词：
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We performed an uniform spectroscopic analysis of 1111 FGK dwarfs observed as part of the HARPS GTO planet search program. We applied a purely chemical approach, based on [alpha/Fe] ratio, to distinguish the various stellar components in the Galaxy. Apart from the well known Galactic thick and thin disks, we separated an alpha-enhanced stellar family at super-solar metallicities. The metal-rich high-alpha stars have orbits similar to the thin disk stars, but they are similar to thick disk stars in terms of age. Our data indicate that the incidence of stars with planets are greater among the chemically separated "thick" disk stars with [Fe/H] less than or similar to -0.3 dex than they are among "thin" disk stars in the same [Fe/H] interval. Our results allow us to suppose that a certain chemical composition, and not the Galactic birth place of the stars, is the causative factor for that.
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页码：117 / +
页数：2
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