Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5011m&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #50.11; Bulletin of the American Astronomical Society, Vol. 31, p.1448
Astronomy and Astrophysics
Astronomy
Scientific paper
The star β CMa (B1 II-III) is among the brightest of the β 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 Angstroms). 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 β 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 β Cephei pulsations resulting from investigation of its three periods which are each near a quarter day.
Cassinelli Joe P.
Cohen David H.
Miller Nancy A.
Peters Geraldine Joan
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