Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..219b&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 219-222 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
14
B Stars, Ions, Stellar Luminosity, Stellar Winds, Ultraviolet Spectra, Carbon, Electromagnetic Absorption, Iue, Stellar Rotation
Scientific paper
High dispersion IUE spectra were obtained of 72 luminosity class III to V Be stars and 82 luminosity class IC to V normal (no H alpha emission) B stars, with the objects in each group distributed at random in projected rotational velocity and spectral type. For normal B stars, the C IV lambda 1548,50 resonance doublet is observed only at type B2 or earlier, whereas C IV can occur as late as B9 among the Be stars. In both groups of stars the average C IV equivalent width is greatest at the earliest spectral types, and decreases rapidly in strength toward later types; however, at each spectral subtype a large range of C IV equivalent widths exists. From B0 to B2 the average C IV equivalent width is about a factor of two higher for Be stars than for normal B stars. For the Be stars there is no correlation between the equivalent widths of C IV absorption and He alpha emission. Neither normal B nor B stars show any clear correlation between C IV equivalent width and projected rotational velocity v sin i. C IV emission is definitely present in only two Be stars; this is sharp contrast to the magnetic stars in this spectral region, which frequently show C IV strongly in emission above the continuum.
Barker Paul K.
Landstreet John Darlington
Marlborough J. M.
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