Abundances of Na, Mg and Al in stars with giant planets

Details Abundances of Na, Mg and Al in stars with giant planets Abundances of Na, Mg and Al in stars with giant planets

2005-04-06

arxiv.org/abs/astro-ph/0504157v2

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A; replaced on the 19/04/2005 with new version updated for language corrections

Scientific paper

10.1051/0004-6361:20052750

We present Na, Mg and Al abundances in a set of 98 stars with known giant planets, and in a comparison sample of 41 ``single'' stars. The results show that the [X/H] abundances (with X = Na, Mg and Al) are, on average, higher in stars with giant planets, a result similar to the one found for iron. However, we did not find any strong difference in the [X/Fe] ratios, for a fixed [Fe/H], between the two samples of stars in the region where the samples overlap. Finally, the data was used to study the Galactic chemical evolution trends for Na, Mg and Al, and to discuss the possible influence of planets on this evolution. The results, in general similar to the ones obtained by other authors, show that the [X/Fe] ratios all decrease as a function of metallicity up to solar values. While for Mg and Al this trend then becomes relatively constant, for Na we find indications of an upturn up to [Fe/H] values close to 0.25dex. For metallicities above this value the [Na/Fe] becomes constant.

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