ORFEUS-SPAS II Extreme-Ultraviolet Spectroscopy of epsilon CMa (B2 II)

Details ORFEUS-SPAS II Extreme-Ultraviolet Spectroscopy of epsilon CMa (B2 II) ORFEUS-SPAS II Extreme-Ultraviolet Spectroscopy of epsilon CMa (B2 II)

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500l..51c&link_type=abstract

Astrophysical Journal Letters v.500, p.L51

Astronomy and Astrophysics

Astronomy

2

Stars: Atmospheres, Line: Identification, Stars: Early-Type, Stars: Individual Constellation Name: Epsilon Canis Majoris, Ultraviolet: Stars

Scientific paper

We report on extreme-ultraviolet (EUV) spectroscopic observations of the B bright giant epsilon Canis Majoris made during the ORFEUS-SPAS II mission. We assess the performance of the instrument in the EUV and find that the effective area is roughly 3 times that of the Extreme-Ultraviolet Explorer long-wavelength spectrometer and that the spectral resolution is lambda / Delta lambda ~1250 . We identify most of the features, qualitatively compare different models, and examine the wind-broadened O V and Si IV lines, which display blue-edge velocities up to 800 km s ^{-1} .

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