Query : 2013A&A...552A..42M

2013A&A...552A..42M - Astronomy and Astrophysics, volume 552A, 42-42 (2013/4-1)

Abundance study of the two solar-analogue CoRoT targets HD 42618 and HD 43587 from HARPS spectroscopy.


Abstract (from CDS):

We present a detailed abundance study based on spectroscopic data obtained with HARPS of two solar-analogue main targets for the asteroseismology programme of the CoRoT satellite: HD42618 and HD43587. The atmospheric parameters and chemical composition are accurately determined through a fully differential analysis with respect to the Sun observed with the same instrumental set-up. Several sources of systematic errors largely cancel out with this approach, which allows us to narrow down the 1-σ error bars to typically 20K in effective temperature, 0.04dex in surface gravity, and less than 0.05dex in the elemental abundances. Although HD42618 fulfils many requirements for being classified as a solar twin, its slight deficiency in metals and its possibly younger age indicate that, strictly speaking, it does not belong to this class of objects. On the other hand, HD43587 is slightly more massive and evolved. In addition, marked differences are found in the amount of lithium present in the photospheres of these two stars, which might reveal different mixing properties in their interiors. These results will put tight constraints on the forthcoming theoretical modelling of their solar-like oscillations and contribute to increase our knowledge of the fundamental parameters and internal structure of stars similar to our Sun.

Abstract Copyright:

Journal keyword(s): asteroseismology - stars: fundamental parameters - stars: abundances

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 HD 42618 PM* 06 12 00.5668858951 +06 46 59.057784676 7.632 7.496 6.839 6.478 6.143 G4V 165 0
2 G 106-36 PM* 06 17 10.6373672064 +05 07 02.671624848   14.91 13.32 12.852   M3.5V 52 1
3 HD 43587 SB* 06 17 16.1297031648 +05 05 59.904745548 6.400 6.290   5.3   G0V 229 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12914 0

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