Article (Scientific journals)
An asteroseismic study of the β Cephei star 12 Lacertae: multisite spectroscopic observations, mode identification and seismic modelling
Desmet, M.; Briquet, Maryline; Thoul, Anne et al.
2009In Monthly Notices of the Royal Astronomical Society, 396, p. 1460-1472
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Keywords :
stars: individual: 12 Lac; stars: interiors; stars: oscillations
Abstract :
[en] We present the results of a spectroscopic multisite campaign for the β Cephei star 12 (DD) Lacertae. Our study is based on more than thousand high-resolution high S/N spectra gathered with eight different telescopes in a time span of 11 months. In addition, we make use of numerous archival spectroscopic measurements. We confirm 10 independent frequencies recently discovered from photometry, as well as harmonics and combination frequencies. In particular, the slowly pulsating B-stars (SPB)-like g-mode with frequency 0.3428d[SUP]-1[/SUP] reported before is detected in our spectroscopy. We identify the four main modes as (l[SUB]1[/SUB], m[SUB]1[/SUB]) = (1, 1), (l[SUB]2[/SUB], m[SUB]2[/SUB]) = (0, 0), (l[SUB]3[/SUB], m[SUB]3[/SUB]) = (1, 0) and (l[SUB]4[/SUB], m[SUB]4[/SUB]) = (2, 1) for f[SUB]1[/SUB] = 5.178964d[SUP]-1[/SUP], f[SUB]2[/SUB] = 5.334224d[SUP]-1[/SUP], f[SUB]3[/SUB] = 5.066316d[SUP]-1[/SUP] and f[SUB]4[/SUB] = 5.490133d[SUP]-1[/SUP], respectively. Our seismic modelling shows that f[SUB]2[/SUB] is likely the radial first overtone and that the core overshooting parameter α[SUB]ov[/SUB] is lower than 0.4 local pressure scale heights.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Desmet, M.;  Institute of Astronomy - KULeuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
Briquet, Maryline ;  Katholieke Universiteit Leuven - KUL > Physics > Institute of Astronomy
Thoul, Anne  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Zima, W.;  Institute of Astronomy - KULeuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
De Cat, P.;  Koninklijke Sterrenwacht van Belgium, Ringlaan 3, 1180 Brussel, Belgium
Handler, G.;  Institut für Astronomie, Universistät Wien, Türkenschanzstrasse 17, 1180 Wien, Austria
Ilyin, I.;  Astrophysical Institute Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
Kambe, E.;  Okayama Astrophysical Observatory, National Astronomical Observatory, Kamogata, Okayama 719-0232, Japan
Krzesinski, Jurek
Lehmann, H.;  Karl-Schwarzschild-Observatorium, Thüringer Landessternwarte, 7778 Tautenburg, Germany
Masuda, S.;  Tokushima Science Museum, Asutamu Land Tokushima, 45-22 Kibigadani, Nato, Itano-cho, Itano-gun, Tokushima 779-0111, Japan
Mathias, P.;  UNS, CNRS, OCA, Campus Valrose, UMR 6525 H. Fizeau, F-06108 Nice Cedex 2, France
Mkrtichian, D. E.;  Astronomical Observatory of Odessa National University, Marazlievskaya, 1v, 65014 Odessa, Ukraine
Telting, J.;  Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Spain
Uytterhoeven, K.;  Instituto de Astrofísica de Canarias, Calle Via Láctea s/n, 38205 La Laguna, TF, Spain
Yang, S. L. S.;  Department of Physics and Astronomy, Universtity of Victoria, Victoria, BC V8W 3P6, Canada
Aerts, C.;  Institute of Astronomy - KULeuven, Celestijnenlaan 200D, 3001 Leuven, Belgium ; Department of Astrophysics, University of Nijmegen, PO Box 9010, 6500 GL Nijmegen, the Netherlands
More authors (7 more) Less
Language :
English
Title :
An asteroseismic study of the β Cephei star 12 Lacertae: multisite spectroscopic observations, mode identification and seismic modelling
Publication date :
01 July 2009
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
396
Pages :
1460-1472
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/0903.5477
Available on ORBi :
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