J/A+A/599/A96 [C/H] Chemical abundances of 1110 stars (Suarez-Andres+, 2017)
CNO behaviour in planet-harbouring stars.
II. Carbon abundances in stars with and without planets using the CH band.
Suarez-Andres L., Israelian G., Gonzalez Hernandez J.I., Adibekyan V.Zh.,
Delgado Mena E., Santos N.C., Sousa S.G.
<Astron. Astrophys. 599, A96 (2017)>
=2017A&A...599A..96S 2017A&A...599A..96S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, double and multiple ; Abundances, peculiar
Keywords: stars: abundances - stars: chemically peculiar -
stars: planetary systems
Abstract:
Carbon, oxygen and nitrogen (CNO) are key elements in stellar
formation and evolution, and their abundances should also have a
significant impact on planetary formation and evolution.
We aim to present a detailed spectroscopic analysis of 1110 solar-type
stars, 143 of which are known to have planetary companions. We have
determined the carbon abundances of these stars and investigate a
possible connection between C and the presence of planetary
companions.
We used the HARPS spectrograph to obtain high-resolution optical
spectra of our targets. Spectral synthesis of the CH band at 4300Å
was performed with the spectral synthesis codes MOOG and FITTING. We
have studied carbon in several reliable spectral windows and have
obtained abundances and distributions that show that planet host stars
are carbon rich when compared to single stars, a signature caused by
the known metal-rich nature of stars with planets. We find no
different behaviour when separating the stars by the mass of the
planetary companion.
We conclude that reliable carbon abundances can be derived for
solar-type stars from the CH band at 4300Å. We confirm two
different slope trends for [C/Fe] with [Fe/H] because the behaviour is
opposite for stars above and below solar values. We observe a flat
distribution of the [C/Fe] ratio for all planetary masses, a finding
that apparently excludes any clear connection between the [C/Fe]
abundance ratio and planetary mass.
Description:
Stellar parameters and [C/H] abundances for 1110 stars studied. For
each star Teff, logg, [Fe/H], vtur, [C/H] and e_[C/H] are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 1110 Stellar parameters and [C/H] abundances
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See also:
J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of the targets
12- 15 I4 K Teff Effective temperature
17- 20 F4.2 [cm/s2] logg Gravity (logg)
22- 26 F5.2 [-] [Fe/H] Metallicity
28- 31 F4.2 km/s vtur Microturbulence velocity
33- 39 F7.4 [-] [C/H] Carbon abundance
41- 44 F4.2 [-] e_[C/H] Errors in [C/H]
46- 50 A5 --- popB Population
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Acknowledgements:
Lucia Suarez-Andres, lsuarez(at)iac.es
References:
Adibekyan et al., 2012A&A...545A..32A 2012A&A...545A..32A, Cat. J/A+A/545/A32
Chemical abundances of 1111 FGK stars from the HARPS GTO planet search
program. Galactic stellar populations and planets
(End) Lucia Suarez-Andres [IAC, Spain], Patricia Vannier [CDS] 02-Jan-2017