Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..332..137s&link_type=abstract
The Fate of the Most Massive Stars, ASP Conference Series, Vol. 332, Proceedings of the conference held 23-28 May, 2004 in Grand
Astronomy and Astrophysics
Astronomy
Scientific paper
We present spectroscopic observations with high spectral resolution of the Homunculus nebula of η Car over the 2003.5 ``spectroscopic event''. The observed spectra represent the stellar spectrum emitted near the pole of the star and are much less contaminated with nebular emission lines than ground-based observations of the central object. The ``event'' is qualitatively similar near the pole to what is observed in direct spectra of the star (more equator-on), but shows interesting differences. A high-velocity absorption is present near the event, indicating that the event is not only a change in ionization and excitation structure. He IIλ4686 emission is observed for a brief period of time near the event and appears to precede similar emission at the center. The observations show that the spectroscopic event is less pronounced in Hα at the pole than at the equator of η Car.
Bomans Dominik J.
Davidson Kris
Gull Ted R.
Humphreys Roberta M.
Stahl Otmar
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