Article (Scientific journals)
On the determination of oxygen abundances in chromospherically active stars
Morel, Thierry; Micela, G.
2004In Astronomy and Astrophysics, 423, p. 677-682
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Keywords :
stars: abundances; stars: activity; line: formation
Abstract :
[en] We discuss oxygen abundances derived from [O I] λ6300s and the O I triplet in stars spanning a wide range in chromospheric activity level, and show that these two indicators yield increasingly discrepant results with higher chromospheric/coronal activity measures. While the forbidden and permitted lines give fairly consistent results for solar-type disk dwarfs, spuriously high O I triplet abundances are observed in young Hyades and Pleiades stars, as well as in individual components of RS CVn binaries (up to 1.8 dex). The distinct behaviour of the [O I]-based abundances which consistently remain near-solar suggests that this phenomenon mostly results from large departures from LTE affecting the O I triplet at high activity level that are currently unaccounted for, but also possibly from a failure to adequately model the atmospheres of K-type stars. These results suggest that some caution should be exercised when interpreting oxygen abundances in active binaries or young open cluster stars. Based on observations collected at the European Southern Observatory, Chile (Proposals 64.L-0249 and 071.D-0260). Table \ref{tab_data} is only available in electronic form at http://www.edpsciences.org
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Morel, Thierry  ;  Osservatorio Astronomico di Palermo G. S. Vaiana, Istituto Nazionale di Astrofisica
Micela, G.;  Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Palermo G. S. Vaiana, Piazza del Parlamento 1, 90134 Palermo, Italy
Language :
English
Title :
On the determination of oxygen abundances in chromospherically active stars
Publication date :
01 August 2004
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
423
Pages :
677-682
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/astro-ph/0405086
Available on ORBi :
since 19 February 2010

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