Reference : Multisite spectroscopic seismic study of the β Cep star V2052 Ophiuchi: inhibition of...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/140267
Multisite spectroscopic seismic study of the β Cep star V2052 Ophiuchi: inhibition of mixing by its magnetic field
English
Briquet, Maryline mailto [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 mailto [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 mailto [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, A. M. [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)]
1-Nov-2012
Monthly Notices of the Royal Astronomical Society
427
483-493
Yes (verified by ORBi)
International
0035-8711
[en] stars: early-type ; stars: individual: V2052 Oph ; stars: interiors ; stars: magnetic field ; starspots
[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.
http://hdl.handle.net/2268/140267
10.1111/j.1365-2966.2012.21933.x
http://adsabs.harvard.edu/abs/2012MNRAS.427..483B
http://de.arxiv.org/abs/1208.4250

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
MNRAS_427_483.pdfPublisher postprint1.8 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.