Abundance analysis of prime B-type targets for asteroseismology. II. B6-B9.5 stars in the field of view of the CoRoT satellite

Niemczura, E.; Morel, Thierry; Aerts, C.

doi:10.1051/0004-6361/200911931

Article (Scientific journals)

Abundance analysis of prime B-type targets for asteroseismology. II. B6-B9.5 stars in the field of view of the CoRoT satellite

Niemczura, E.; Morel, Thierry; Aerts, C.

2009 • In Astronomy and Astrophysics, 506, p. 213-233

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/31637

DOI
10.1051/0004-6361/200911931

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Keywords :

stars: abundances; stars: atmospheres; stars: chemically peculiar

Abstract :

[en] Context: <BR />Aims: The main goal of the ground-based seismology support program for the CoRoT mission was to obtain photometric and spectroscopic data for stars in the fields monitored by the satellite. These ground-based observations were collected in the GAUDI archive. High-resolution spectra of more than 200 B-type stars are available in this database, and about 45% of them is analysed here. <BR />Methods: To derive the effective temperature of the stars, we used photometric indices. Surface gravities were obtained by comparing observed and theoretical Balmer line profiles. To determine the chemical abundances and rotational velocities, we used a spectrum synthesis method, which consisted of comparing the observed spectrum with theoretical ones based on the assumption of LTE. <BR />Results: Atmospheric parameters, chemical abundances, and rotational velocities were determined for 89 late-B stars. The dominant species in their spectra are iron-peak elements. The average Fe abundance is 7.24 Â± 0.45 dex. The average rotational velocity is 126 km s[SUP]-1[/SUP], but there are 13 and 20 stars with low and moderate V sin i values, respectively. The analysis of this sample of 89 late B-type stars reveals many chemically peculiar (CP) stars. Some of them were previously known, but at least 9 new CP candidates, among which at least two HgMn stars, are identified in our study. These CP stars as a group exhibit V sin i values lower than the stars with normal surface chemical composition. Atmospheric parameters and abundance analysis results are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/506/213 The CoRoT space mission was developed and is operated by the French space agency CNES, with participation of ESA's RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain. Tables [see full textsee full text] and [see full textsee full text] are only available in electronic form at http://www.aanda.org

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Niemczura, E.; Astronomical Institute, WrocÅ aw University, Kopernika 11, 51-622 WrocÅ aw, Poland ; Institute of Astronomy, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium

Morel, Thierry ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)

Aerts, C.; Institute of Astronomy, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium ; Department of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL, Nijmegen, The Netherlands

Language :

English

Title :

Abundance analysis of prime B-type targets for asteroseismology. II. B6-B9.5 stars in the field of view of the CoRoT satellite

Publication date :

01 October 2009

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

506

Pages :

213-233

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2009A%26A...506..213N

Commentary :

http://de.arxiv.org/abs/0906.4934

Available on ORBi :

since 19 February 2010

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