Article (Scientific journals)
Multisite spectroscopic seismic study of the β Cep star V2052 Ophiuchi: inhibition of mixing by its magnetic field
Briquet, Maryline; Neiner, C.; Aerts, C. et al.
2012In Monthly Notices of the Royal Astronomical Society, 427, p. 483-493
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Keywords :
stars: early-type; stars: individual: V2052 Oph; stars: interiors; stars: magnetic field; starspots
Abstract :
[en] We used extensive ground-based multisite and archival spectroscopy to derive observational constraints for a seismic modelling of the magnetic β Cep star V2052 Ophiuchi. The line-profile variability is dominated by a radial mode (f1 = 7.148 46 d-1) and by rotational modulation (P_rot = 3.638 833 d). Two non-radial low-amplitude modes (f2 = 7.756 03 d-1 and f3 = 6.823 08 d-1) are also detected. The four periodicities that we found are the same as the ones discovered from a companion multisite photometric campaign and known in the literature. Using the photometric constraints on the degrees ℓ of the pulsation modes, we show that both f_2 and f_3 are prograde modes with (ℓ, m) = (4, 2) or (4, 3). These results allowed us to deduce ranges for the mass (M ∈ [8.2, 9.6] M_sun) and central hydrogen abundance (X_c ∈ [0.25, 0.32]) of V2052 Oph, to identify the radial orders n1 = 1, n2 = -3 and n3 = -2, and to derive an equatorial rotation velocity v_eq ∈ [71, 75] km s-1. The model parameters are in full agreement with the effective temperature and surface gravity deduced from spectroscopy. Only models with no or mild core overshooting (α_ov ∈ [0, 0.15] local pressure scale heights) can account for the observed properties. Such a low overshooting is opposite to our previous modelling results for the non-magnetic β Cep star θ Oph having very similar parameters, except for a slower surface rotation rate. We discuss whether this result can be explained by the presence of a magnetic field in V2052 Oph that inhibits mixing in its interior.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Briquet, Maryline ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Neiner, C.;  LESIA, UMR 8109 du CNRS, Observatoire de Paris, UPMC, Univ. Paris Diderot, 5 Place Jules Janssen 92195 Meudon Cedex, France
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
Morel, Thierry  ;  Université de Liège - ULiège > GAPHE : Astrophysique observationnelle (sol et espace)
Mathis, S.;  LESIA, UMR 8109 du CNRS, Observatoire de Paris, UPMC, Univ. Paris Diderot, 5 Place Jules Janssen 92195 Meudon Cedex, France ; Laboratoire AIM Paris-Saclay, CEA/DSM-CNRS-Université Paris Diderot, IRFU/SAp, Centre de Saclay 91191 Gif-sur-Yvette Cedex, France
Reese, Daniel ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Lehmann, H.;  Thüringer Landessternwarte Tautenburg (TLS), Sternwarte 5 07778 Tautenburg, Germany
Costero, R.;  Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria México, DF 04510 Mexico
Echevarria, J.;  Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria México, DF 04510 Mexico
Handler, G.;  Copernicus Astronomical Center, Bartycka 18 00-716 Warsaw, Poland
Kambe, E.;  Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Honjyo 3037-5, Kamogata Asakuchi, Okayama 719-0232 Japan
Hirata, R.;  Otokoyama-Yutoku, 7, E17-201 Yawata, Kyoto 614-8371 Japan
Masuda, S.;  Hayashi 2528-5 Takamatsu, Kagawa 761-0301 Japan
Wright, D.;  Department of Astrophysics, School of Physics, University of New South Wales, NSW, 2050 Australia
Yang, S.;  Department of Physics and Astronomy, University of Victoria, PO Box 3055 Victoria, BC V8W 3P6 Canada
Pintado, O.;  Instituto Superior de Correlación Geologica-CONICET, Tucuman, Argentina
Mkrtichian, D.;  National Astronomical Research Institute of Thailand, Siripanich Building 191 Huay Kaew Road Muang District, Chiangmai 50200 Thailand ; Crimean Astrophysical Observatory, Nauchny, Crimea 98409 Ukraine
Lee, B. C.;  Korea Astronomy and Space Science Institute, 776, Daedeokdae-Ro Youseong-Gu, Daejeon 305-348 Korea
Han, I.;  Korea Astronomy and Space Science Institute, 776, Daedeokdae-Ro Youseong-Gu, Daejeon 305-348 Korea
Bruch, A.;  Laboratório Nacional de Astrofísica, Rua Estados Unidos, 154 - Bairro das Nacões 37504-364 Itajubá Brazil
De Cat, P.;  Royal Observatory of Belgium, 3 Avenue Circulaire 1180 Brussel, Belgium
Uytterhoeven, K.;  Instituto de Astrofísica de Canarias (IAC), Calle Via Lactea s/n, 38205 La Laguna, Tenerife ; Department Astrofísica, Universidad de La Laguna (ULL), Tenerife,
Lefever, K.;  Institute of Astronomy, KULeuven, Celestijnenlaan 200D 3001 Leuven, Belgium ; Belgian Institute for Space Aeronomy, Ringlaan 3 1080 Brussels, Belgium
Vanautgaerden, J.;  Institute of Astronomy, KULeuven, Celestijnenlaan 200D 3001 Leuven, Belgium
de Batz, B.;  LESIA, UMR 8109 du CNRS, Observatoire de Paris, UPMC, Univ. Paris Diderot, 5 Place Jules Janssen 92195 Meudon Cedex, France
Frémat, Y.;  Royal Observatory of Belgium, 3 Avenue Circulaire 1180 Brussel, Belgium
Henrichs, H.;  Astronomical Institute Anton Pannekoek, University of Amsterdam, Science Park 904 1098XH Amsterdam, the Netherlands
Geers, V. C.;  ETH Zurich, Institute for Astronomy, Wolfgang-Pauli-Strasse 27 8093 Zurich, Switzerland
Martayan, C.;  European Organization for Astronomical Research in the Southern Hemisphere, Alonso de Cordova 3107 Vitacura, Santiago de Chile Chile
Hubert, Anne-Marie;  GEPI > Observatoire de Paris
Thizy, O.;  Shelyak Instruments, Les Roussets, 38420 Revel France
Tijani, A.;  Astronomical Institute 'Anton Pannekoek', University of Amsterdam, Kruislaan 403 1098 SJ Amsterdam, the Netherlands)
More authors (22 more) Less
Language :
English
Title :
Multisite spectroscopic seismic study of the β Cep star V2052 Ophiuchi: inhibition of mixing by its magnetic field
Publication date :
01 November 2012
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
427
Pages :
483-493
Peer reviewed :
Peer Reviewed verified by ORBi
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