Reference : Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75368
Periodic mass-loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD 50064
English
Aerts, C. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium ; Department of Astrophysics, IMAPP, University of Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands]
Lefever, K. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium; Belgisch Instituut voor Ruimte Aeronomie (BIRA), Ringlaan 3, 1180 Brussels,Belgium]
Baglin, A. [LESIA, CNRS UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon Cedex, France]
Degroote, P. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium]
Oreiro, R. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium]
Vuckovic, M. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium]
Smolders, K. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium]
Acke, B. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium]
Verhoelst, T. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium]
Desmet, M. [Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D, 3001Leuven, Belgium]
Godart, Mélanie [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Noels-Grötsch, Arlette [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Dupret, Marc-Antoine [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Auvergne, M. [Belgisch Instituut voor Ruimte Aeronomie (BIRA), Ringlaan 3, 1180 Brussels,Belgium]
Baudin, F. [Institut d'Astrophysique Spatiale, CNRS/Université Paris XI UMR 8617, 91405 Orsay, France]
Catala, C. [Belgisch Instituut voor Ruimte Aeronomie (BIRA), Ringlaan 3, 1180 Brussels,Belgium]
Michel, Eric [> >]
Samadi, R. [Belgisch Instituut voor Ruimte Aeronomie (BIRA), Ringlaan 3, 1180 Brussels,Belgium]
1-Apr-2010
Astronomy and Astrophysics
513
L11
Yes (verified by ORBi)
International
0004-6361
[en] asteroseismology ; stars: oscillations ; stars: winds ; outflows ; stars: individual: HD 50064 ; stars: atmospheres ; supergiants
[en] <BR /> Aims: We aim to interpret the photometric and spectroscopic variability of the luminous blue variable supergiant HD 50064 (V = 8.21). <BR /> Methods: CoRoT space photometry and follow-up high-resolution spectroscopy with a time base of 137 d and 169 d, respectively, was gathered, analysed, and interpreted using standard time series analysis and light curve modelling methods, as well as spectral line diagnostics. <BR /> Results: The space photometry reveals one period of 37 d, which undergoes a sudden amplitude change with a factor 1.6. The pulsation period is confirmed in the spectroscopy, which additionally reveals metal line radial velocity values differing by 30 km s[SUP]-1[/SUP] depending on the spectral line and on the epoch. We estimate T[SUB]eff[/SUB] 13 500 K, log g 1.5 from the equivalent width of Si lines. The Balmer lines reveal that the star undergoes episodes of changing mass loss on a time scale similar to the changes in the photometric and spectroscopic variability, with an average value of log dot{M} â -5 (in M_ȯ yr[SUP]-1[/SUP]). We tentatively interpret the 37 d period as the result of a strange mode oscillation. Based on high-resolution spectroscopy assembled with the CORALIE spectrograph attached to the 1.2 m Euler telescope at La Silla, Chile and on CoRoT space-based photometry. The CoRoT space mission was developed and is operated by the French space agency CNES, with the participation of ESA's RSSD and Science Programmes, Austria, Belgium, Brazil, Germany, and Spain.Postdoctoral Fellow of the Fund for Scientific Research of Flanders (FWO), Belgium.
http://hdl.handle.net/2268/75368
10.1051/0004-6361/201014124
http://adsabs.harvard.edu/abs/2010A%26A...513L..11A
http://de.arxiv.org/abs/1003.5551

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