Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

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

Previous Section Next Section Title Page Table of Contents

1. Introduction

BT Cancri = HD 73575 = 38 Cancri was discovered as a [FORMULA] Sct variable by Breger (1970), who also made a detailed analysis of the observations available until 1980 (Breger 1980). Breger found two definite oscillation frequencies and one probable frequency, and used the period ratios to suggest identification with low-order radial modes.

As a bachelor-project in 1994 two of the present authors (LMF and SSL) decided to observe a field in Praesepe with the purpose of studying known [FORMULA] Sct variables and perhaps to discover new low-amplitude variables. The field contains two known [FORMULA] Sct stars , HD 73450 and HD 73575, and no new variable was found. The data for HD 73450 turned out to be too uncertain to derive definite results due to relatively low signal-to-noise ratio. HD 73575 = BT Cnc, which is the brightest known [FORMULA]  Scuti star in the Praesepe cluster, is about 1.8 mag brighter than HD 73450, and we therefore expect more significant results for this star. Further, HD 73575 also has considerably higher pulsation amplitude than HD 73450. Here we present the observations of BT Cnc, and give a brief discussion of the resulting oscillation spectrum.

Previous Section Next Section Title Page Table of Contents

© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998