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The 2002 campaign of FG Vir: Mode identification by high resolution spectroscopy
W. Zima1, U. Heiter2, P. L. Cottrell3, H. Lehmann4, and E. Poretti5
1 Institut für Astronomie, Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
2 Department of Astronomy, Case Western Reserve University, Cleveland, Ohio, USA 3 Mt. John University Observatory, Dept.of Physics and Astronomy, Univ. of Canterbury, Christchurch, New Zealand 4 Thüringer Landessternwarte Tautenburg, Germany 5 Osservatorio Astronomico di Brera, Merate, Italy
From 2002 February to May a global Delta Scuti Network campaign, utilizing high-resolution spectroscopy as well as photometry, has been carried out for FG Vir (HD 106384, V = 6.57, A5V). This star is nonradially pulsating with at least 24 modes and the possible presence of g-modes provides the possibility to probe its deep interior. Several photometric as well as spectroscopic observing campaigns have already been performed on FG Vir, but a reliable mode identification and thus definite pulsational models are still lacking. In this campaign we have acquired 850 echelle spectra covering 120 hours at six observatories. Mode identification is performed by modelling of the line profile variations and the pixel-by-pixel method (L. Mantegazza, ASP Conference Series, Vol. 210, 138, 2000). Preliminary results of this campaign are presented.
Last changed: 2002/Jun/25
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