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

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2013

Autores

Adibekyan, VZ (Autor) Outra; N.C. Santos (Autor) FCUP; Sousa, SG (Autor) FCUP; Israelian, G (Autor) Outra; Figueira, P (Autor) Outra

Ata de Conferência Internacional

Título: NEW QUESTS IN STELLAR ASTROPHYSICS III: A PANCHROMATIC VIEW OF SOLAR-LIKE STARS, WITH AND WITHOUT PLANETS

Páginas: 117-120

3rd International Conference on New Quests in Stellar Astrophysics: A Panchromatic View of Solar-like Stars With and Without Planets

Puerto Vallarta, MEXICO, MAR 12-16, 2012

Indexação

ISI Web of Knowledge - 0 Citações

Outras Informações

ID Authenticus: P-006-FVD

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4