Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

Astron. Astrophys. 338, 909-918 (1998)

Table of Contents
Available formats: HTML | PDF | (gzipped) PostScript

Photometry and asteroseismology of [FORMULA] Scuti stars in Praesepe

T. Arentoft 1, 2, H. Kjeldsen 1, 3, J. Nuspl 4, T.R. Bedding 5, A. Frontó 4, M. Viskum 1, S. Frandsen 1 and J.A. Belmonte 6

1 Institute of Physics and Astronomy, Aarhus University, Bygn. 520, DK-8000 Aarhus C, Denmark (toar@obs.aau.dk; hans@obs.aau.dk; mv@obs.aau.dk; srf@obs.aau.dk)
2 University of Brussels (VUB), Pleinlaan 2, B-1050 Brussels, Belgium (tarentof@vub.ac.be)
3 Theoretical Astrophysics Center, Danmarks Grundforskningsfond, Aarhus University, DK-8000 Aarhus C, Denmark
4 Konkoly Observatory, H-1525 Budapest, Hungary (nuspl@ogyalla.konkoly.hu; fronto@ogyalla.konkoly.hu)
5 School of Physics, University of Sydney 2006, Australia (bedding@physics.usyd.edu.au)
6 Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain (jba@iac.es)

Received 18 March 1998 / Accepted 16 July 1998


We discuss observations and seismic analyses for three multi-periodic [FORMULA] Scuti stars in the Praesepe cluster: BU, BN and BV Cnc. For two stars (BU and BN Cnc) we re-analyse published photoelectric photometry and show that using statistical weights results in a dramatic reduction in the noise level. We detect seven frequencies in BU Cnc and eight in BN Cnc, with three of the latter being previously unknown. We also present new time-series CCD observations of BN and BV Cnc that successfully demonstrate high-precision differential photometry on strongly defocussed images. The observations show that BV Cnc is a multi-periodic variable, with at least four oscillation frequencies. Finally, we compare the observed oscillation frequencies in the three stars with models and derive luminosities, effective temperatures and masses.

Key words: stars: variables: ffi Scuti – stars: oscillations – open clusters and associations: individual: Praesepe – methods: data analysis

Send offprint requests to: T. Arentoft

© European Southern Observatory (ESO) 1998

Online publication: September 17, 1998