Bibcode
Adibekyan, V. Zh; Santos, N. C.; Sousa, S. G.; Israelian, G.; Figueira, P.
Referencia bibliográfica
New Quests in Stellar Astrophysics III: A Panchromatic View of Solar-like Stars, With and Without Planets, ASP Conference Series, Vol. 472, p. 117
Advertised on:
5
2013
Número de citas
1
Número de citas referidas
0
Descripción
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 [α/Fe] ratio, to distinguish the various stellar
components in the Galaxy. Apart from the well known Galactic thick and thin
disks, we separated an -enhanced stellar family at super-solar metallicities.
The metal-rich high-α 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] ≤ -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.