Close-up of primary and secondary asteroseismic CoRoT targets and the ground-based follow-up observations
English
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 - ULg > 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]
[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.
[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
