Bibcode
Arentoft, T.; Kjeldsen, H.; Nuspl, J.; Bedding, T. R.; Fronto, A.; Viskum, M.; Frandsen, S.; Belmonte, J. A.
Bibliographical reference
Astronomy and Astrophysics, v.338, p.909-918 (1998)
Advertised on:
10
1998
Journal
Citations
26
Refereed citations
19
Description
We discuss observations and seismic analyses for three multi-periodic
delta 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.