AAS 195th Meeting, January 2000
Session 50. Stellar Atmospheres
Display, Thursday, January 13, 2000, 9:20am-6:30pm, Grand Hall

[Previous] | [Session 50] | [Next]

[50.11] EUVE Spectroscopy and Variability Analysis of \beta Canis Majoris in the 300-700 ÅBand

N.A. Miller (Dept. Astronomy, U. Wisc.-Madison), D.H. Cohen (Bartol Research Inst., U. Delaware), J.P. Cassinelli (Dept. Astronomy, U. Wisc.-Madison), G.J. Peters (Space Sciences Center-USC)

The star \beta CMa (B1 II-III) is among the brightest of the \beta Cephei class of variables. It is fortuitously located along a low (2x1018 cm-2) HI column density ``tunnel" which allows study in the Extreme Ultraviolet Explorer's LW bandpass (300-700 Å). It presents a unique opportunity as one of only two early-type stars which can be observed in this wavelength regime. We have acquired a large (roughly 700 ks) set of observations for this star, spanning four years. We present a high signal-to-noise photospheric spectrum of this star and discuss the periodicities detected in this data series.

Analysis of \beta CMa's EUV variablility complements knowledge of the star's well-known optical variability by sampling a different layer in its atmosphere. We discuss insights into \beta Cephei pulsations resulting from investigation of its three periods which are each near a quarter day.

[Previous] | [Session 50] | [Next]