AAS 205th Meeting, 9-13 January 2005
Session 18 Eclipsing Binaries and Contact Binaries
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

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[18.05] High Precision Photometry with WIRE: Converting Spectroscopic Binaries to Eclipsing Systems

D. L. Buzasi (US Air Force Academy), H. Bruntt (Copenhagen University & US Air Force Academy), H. L. Preston (US Air Force Academy & UNISA), J. V. Clausen (Copenhagen University)

In February March 2004, the WIRE satellite observed Lambda Sco and 57 Eri, two early B subgiant stars. Lambda Sco is a known \beta Cepheid and spectroscopic binary (Uytterhoeven et al. 2004), while 57 Eri has been previously reported only as a spectroscopic binary. The WIRE light curves, which are characterized by white noise levels more than an order of magnitude less than those obtained from ground-based sources, show clearly that both stars are multimodal \beta Cepheids. In this paper, we present data and preliminary analysis of the modal structure of the oscillations for both stars.

In addition, for each star we detect 3 eclipses, which have never before been seen in these (previously) spectroscopic binaries. We use data from the eclipses to refine fundamental orbital parameters for these systems.


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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.