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Narrow Absorption Components in The UV Spectra of HD110432 (B1 IIIe)

Published online by Cambridge University Press:  23 September 2016

Raman K. Prinja
Dept. of Physics & Astronomy, UCL, Gower St., London, England
Huib F. Henrichs
JILA, University of Colorado, Boulder, Colorado, U.S.A.


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We present high resolution IUE ultraviolet observations of multiple narrow absorption components seen in the SiIII, NV, SiIV, and CIV profiles of the B1 IIIe star, HD110432. Spectra taken during March 1986, spanning ∼ 11 days, are modelled using line profile fits. Central velocities and column densities of the discrete features are derived.

The 11 observations obtained during March 1986 (SWP24923–28031) exhibit only minimal line profile variability, but are substantially different from the only other available IUE spectrum of HD110432, taken in April 1981 (fig. 1). This previous image reveals just a single extremely narrow (FWHM ∼ 50 km/s) feature at ∼ 1360 km/s.

III. The Circumstellar Gas
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