Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..124a&link_type=abstract
Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
The A2 Ia-type supergiant star Deneb has been observed by FUSE. A rich absorption spectrum, dominated by Fe II lines, is revealed between 1085Å and 1185Å. The identified lines show no or only small (-25 km s-1) blueward Doppler shifts and no P-Cygni profiles are visible. Apparent emission lines in the spectrum are identified as windows of low opacity and can be reproduced by a PHOENIX hydrostatic model atmosphere. Expanding model atmospheres are needed to reproduce Deneb's excess radio emission and P-Cygni profiles (Hα, Mg II h&k), but, the wind appears largely transparent in the FUSE region. Expanding model atmospheres indicate that enhanced non-LTE ionization of Fe II longrightarrow Fe II can largely hide the wind in the UV and the FUV. Deneb's Wien tail presents a strong challenge to expanding model atmospheres and promises to provide strong constraints on wind's temperature and ionization structure.
Adelman Saul J.
Aufdenberg Jason Paul
Hauschildt Peter. H.
Morrison Nancy D.
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