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Astron. Astrophys. 325, 559-562 (1997)

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

Received 25 February 1997 / Accepted 26 March 1997

Abstract

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: ffi 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

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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