Astron. Astrophys. 325, 559-562
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Oscillations of BT Cancri in the Praesepe cluster*
L.M. Freyhammer, S.S. Larsen, and J.O. Petersen
Copenhagen University Observatory, NBIfAFG,
Juliane Mariesvej 30, DK-2100, Copenhagen Ø, Denmark
Received 25 February 1997 / Accepted 26 March 1997
CCD observations in Johnson B of BT Cancri = HD 73575, the brightest Scuti variable in the Praesepe cluster, obtained on three nights in February 1994 are described. Using least squares Fourier decomposition, two modes of oscillation frequencies 9.783 and 7.005 c/d and amplitudes of 18.0 and 9.9 mmag, respectively, are determined. Comparison with data from the literature indicate that BT Cnc may show secular variations in the oscillation spectrum.
Key words: stars: oscillations - stars: Sct - stars: individual: BT Cnc (HD 73575)
*We dedicate this paper to the memory of Ralph Florentin
Nielsen, whose enthusiastic work with the Brorfelde Schmidt telescope
was essential for the observations.
Send offprint requests to: J.O. Petersen
© European Southern Observatory (ESO) 1997
Online publication: September 9, 1997