J/A+A/438/251 Abundances in stars with giant planets (Beirao+, 2005)
Abundances of Na, Mg and Al in stars with giant planets.
Beirao P., Santos N.C., Israelian G., Mayor M.
<Astron. Astrophys., 438, 251-256 (2005)>
=2005A&A...438..251B 2005A&A...438..251B
ADC_Keywords: Stars, nearby ; Planets ; Abundances
Keywords: stars: abundances - stars: fundamental parameters -
stars: planetary systems: formation - galaxy: abundances -
solar neighbourhood
Abstract:
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. 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, similar to those 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table45.dat 69 98 Atmospheric parameters from Santos et al., 2004,
Cat. J/A+A/415/1153 and abundances for
stars with planets
table6.dat 69 41 Atmospheric parameters and abundances for
comparison sample of stars without known planets
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See also:
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)
Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD name od star
11- 15 F5.2 [Sun] [Na/H] ? Abundance [Na/H]
16 A1 --- n_[Na/H] [n] n: not determined
17- 20 F4.2 [Sun] e_[Na/H] ? rms uncertainty in [Na/H]
22 I1 --- o_[Na/H] ?=0 Number of line used for [Na/H]
24- 28 F5.2 [Sun] [Mg/H] ? Abundance [Mg/H]
29 A1 --- n_[Mg/H] [n] n: not determined
30- 33 F4.2 [Sun] e_[Mg/H] ? rms uncertainty in [Mg/H]
35 I1 --- o_[Mg/H] ?=0 Number of line used for [Mg/H]
37- 41 F5.2 [Sun] [Al/H] ? Abundance [Al/H]
42 A1 --- n_[Al/H] [n] n: not determined
43- 46 F4.2 [Sun] e_[Al/H] ? rms uncertainty in [Al/H]
48 I1 --- o_[Al/H] ?=0 Number of line used for [Al/H]
50- 54 F5.2 [Sun] [Fe/H] Abundance [Fe/H]
56- 59 I4 K Teff Effective temperature
61- 64 F4.2 [cm/s+2] logg Surface gravity
66- 69 F4.2 km/s Vt Microturbulence velocity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Jul-2006