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Issue A&A
Volume 383, Number 3, March I 2002
Page(s) 881 - 891
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20020049



A&A 383, 881-891 (2002)
DOI: 10.1051/0004-6361:20020049

UVSTAR observations of Adara ( $\epsilon$ CMa): 575-1250 Å

A. Gregorio1, 2, R. Stalio1, 2, L. Broadfoot3, F. Castelli4, M. Hack1 and J. Holberg3

1  Dipartimento di Astronomia, Università di Trieste, 34131 Trieste, Italy
2  Center for Advanced Research in Space Optics, Area Science Park, 34012 Trieste, Italy
3  Department of Planetary Sciences, Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA
4  CNR-IAS and Osservatorio Astronomico di Trieste, 34131 Trieste, Italy

(Received 13 November 2000 / Accepted 10 December 2001 )

Abstract
UVSTAR, UltraViolet Spectrograph Telescope for Astronomical Research, operates in the 500-1250 Å wave-band at 1 to 3 Å resolution. Here we report on the EUV and FUV observations of the B2 II star Adara, the brightest EUV source in the sky, obtained by UVSTAR during the STS 69 and STS 95 missions. The discussion concerns 1) wavelength and flux calibration, 2) short term time variability of selected spectral features, 3) comparison with previous measurements in the EUV band and 4) comparison with model atmospheres.


Key words: stars: individual: $\epsilon$ CMa -- early-type -- oscillations -- ultraviolet: stars -- instrumentation: spectrographs  -- space vehicles

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