Reference : Seismic modelling of the β Cephei star HD 180642 (V1449 Aquilae)
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/110793
Seismic modelling of the β Cephei star HD 180642 (V1449 Aquilae)
English
Aerts, C. [Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium ; Department of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL, Nijmegen, The Netherlands]
Briquet, Maryline mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
Degroote, P. [Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium]
Thoul, Anne mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie]
van Hoolst, T. [Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium; Royal Observatory of Belgium, Ringlaan 3, 1180, Brussels, Belgium]
1-Oct-2011
Astronomy and Astrophysics
EDP Sciences
534
98
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] stars: oscillations ; stars: early-type ; stars: massive ; asteroseismology ; stars: individual: HD 180642 (V1449 Aql) ; stars: interiors
[en] Context. We present modelling of the β Cep star HD 180642 based on its observational properties deduced from CoRoT and ground-based photometry as well as from time-resolved spectroscopy. <BR /> Aims: We investigate whether present-day state-of-the-art models are able to explain the full seismic behaviour of this star, which has extended observational constraints for this type of pulsator. <BR /> Methods: We constructed a dedicated database of stellar models and their oscillation modes tuned to fit the dominant radial mode frequency of HD 180642, by means of varying the hydrogen content, metallicity, mass, age, and core overshooting parameter. We compared the seismic properties of these models with those observed. <BR /> Results: We find models that are able to explain the numerous observed oscillation properties of the star, for a narrow range in mass of 11.4-11.8 M[SUB]&sun;[/SUB] and no or very mild overshooting (with up to 0.05 local pressure scale heights), except for an excitation problem of the ℓ = 3, p[SUB]1[/SUB] mode. We deduce a rotation period of about 13 d, which is fully compatible with recent magnetic field measurements. The seismic models do not support the earlier claim of solar-like oscillations in the star. We instead ascribe the power excess at high frequency to non-linear resonant mode coupling between the high-amplitude radial fundamental mode and several of the low-order pressure modes. We report a discrepancy between the seismic and spectroscopic gravity at the 2.5σ level.
http://hdl.handle.net/2268/110793
10.1051/0004-6361/201117629
http://esoads.eso.org/abs/2011A%26A...534A..98A
http://de.arxiv.org/abs/1109.0705

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
aa17629-11.pdfPublisher postprint993.15 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.