Atmospheric parameters and chemical properties of red giants in the CoRoT asteroseismology fields

被引：34

作者：

Morel, T. ^{[1
]}

Miglio, A. ^{[2
,3
]}

Lagarde, N. ^{[2
,3
]}

Montalban, J. ^{[1
]}

Rainer, M. ^{[4
]}

Poretti, F. ^{[4
]}

Eggenberger, P. ^{[5
]}

Hekker, S. ^{[6
,7
]}

Kallinger, T. ^{[8
,9
]}

Mosser, B. ^{[10
]}

Valentini, M. ^{[1
,11
]}

Carrier, F. ^{[8
]}

Hareter, M. ^{[9
]}

Mantegazza, L. ^{[4
]}

机构：

[1] Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium

[2] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[3] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, DK-8000 Aarhus C, Denmark

[4] INAF Osservatorio Astron Brera, I-23807 Merate, LC, Italy

[5] Univ Geneva, Geneva Observ, CH-1290 Versoix, Switzerland

[6] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 XH Amsterdam, Netherlands

[7] Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany

[8] Katholieke Univ Leuven, Dept Natuurkunde & Sterrenkunde, Inst Sterrenkunde, B-3001 Louvain, Belgium

[9] Univ Vienna, Inst Astrophys, A-1180 Vienna, Austria

[10] Univ Paris 07, Observ Paris, Univ Paris 06, LESIA,CNRS, F-92195 Meudon, France

[11] Leibniz Inst Astrophys Potsdam AIP, D-14482 Potsdam, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2014年 / 564卷

基金：

奥地利科学基金会; 欧洲研究理事会; 新加坡国家研究基金会;

关键词：

asteroseismology; stars: fundamental parameters; stars: abundances; stars: interiors; SOLAR-LIKE OSCILLATIONS; LTE LINE FORMATION; LATE-TYPE STARS; DETAILED ABUNDANCE ANALYSIS; INTERMEDIATE-MASS STARS; CARBON-ISOTOPE RATIOS; GLOBULAR-CLUSTER; MODEL ATMOSPHERES; OXYGEN ABUNDANCES; ELEMENTAL ABUNDANCES;

D O I：

10.1051/0004-6361/201322810

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A precise characterisation of the red giants in the seismology fields of the CoRoT satellite is a prerequisite for further in-depth seismic modelling. High-resolution FEROS and HARPS spectra were obtained as part of the ground-based follow-up campaigns for 19 targets holding great asteroseismic potential. These data are used to accurately estimate their fundamental parameters and the abundances of 16 chemical species in a self-consistent manner. Some powerful probes of mixing are investigated (the Li and CNO abundances, as well as the carbon isotopic ratio in a few cases). The information provided by the spectroscopic and seismic data is combined to provide more accurate physical parameters and abundances. The stars in our sample follow the general abundance trends as a function of the metallicity observed in stars of the Galactic disk. After an allowance is made for the chemical evolution of the interstellar medium, the observational signature of internal mixing phenomena is revealed through the detection at the stellar surface of the products of the CN cycle. A contamination by NeNa-cycled material in the most massive stars is also discussed. With the asteroseismic constraints, these data will pave the way for a detailed theoretical investigation of the physical processes responsible for the transport of chemical elements in evolved, low- and intermediate-mass stars.

引用

页数：20

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