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Astron. Astrophys. 325, 559-562

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Research Note

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
(frey@astro.ku.dk, soeren@astro.ku.dk, oz@astro.ku.dk)

Received 25 February 1997 / Accepted 26 March 1997


CCD observations in Johnson B of BT Cancri = HD 73575, the brightest FORMULA 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: FORMULA 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
Last change: April 28, 1998