[en] To optimise the science results of the asteroseismic part of the CoRoT satellite mission a complementary simultaneous ground-based observational campaign is organised for selected CoRoT targets. The observations include both high-resolution spectroscopic and multicolour photometric data. We present the preliminary results of the analysis of the ground-based observations of three targets. A line-profile analysis of 216 high-resolution FEROS spectra of the δ Sct star HD 50844 reveals more than ten pulsation frequencies in the frequency range 5-18 d[SUP]-1[/SUP], including possibly one radial fundamental mode (6.92 d[SUP]-1[/SUP]). Based on more than 600 multi-colour photometric datapoints of the β Cep star HD 180642, spanning about three years and obtained with different telescopes and different instruments, we confirm the presence of a dominant radial mode ν[SUB]1[/SUB] = 5.48695 d[SUP]-1[/SUP], and detect also its first two harmonics. We find evidence for a second mode ν[SUB]2[/SUB] = 0.3017 d[SUP]-1[/SUP], possibly a g-mode, and indications for two more frequencies in the 7-8 d[SUP]-1[/SUP] domain. From Stromgren photometry we find evidence for the hybrid 5 Sct/γ Dor character of the F0 star HD 44195, as frequencies near 3 d[SUP]-1[/SUP] and 21 d[SUP]-1[/SUP] are detected simultaneously in the different filters.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Uytterhoeven, K.; INAF-Brera Astronomical Observatory, Via E. Bianchi 46, 23807 Merate, Italy
Poretti, E.; INAF-Brera Astronomical Observatory, Via E. Bianchi 46, 23807 Merate, Italy
Rainer, M.; INAF-Brera Astronomical Observatory, Via E. Bianchi 46, 23807 Merate, Italy
Mantegazza, L.; INAF-Brera Astronomical Observatory, Via E. Bianchi 46, 23807 Merate, Italy
Zima, W.; Institute of Astronomy, KULeuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
Aerts, C.; Institute of Astronomy, KULeuven, Celestijnenlaan 200D, 3001 Leuven, Belgium ; Department of Astrophysics, University of Nijmegen, IMAPP, PO Box 9010, 6500 GL Nijmegen, the Netherlands
Morel, Thierry ; Katholieke Universiteit Leuven, Departement Natuurkunde en Sterrenkunde, Instituut voor Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven
Miglio, Andrea ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Lefever, K.; Institute of Astronomy, KULeuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
Amado, P. J.; Instituto de AstrofÃsica de AndalucÃa (CSIC), Apartado 3004, 18080 Granada, Spain
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