Other
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..388..173g&link_type=abstract
Mass Loss from Stars and the Evolution of Stellar Clusters ASP Conference Series, Vol. 388, proceedings of the conference held 2
Other
Scientific paper
We report the detection of broad absorptions due to Si IV λλ4088--4116 in the luminous blue variable (LBV) AG Carinae during its last hot phase (2001-2003). Our NLTE spectral analysis, with the radiative transfer code CMFGEN, revealed the photospheric nature of these lines. Using a recently developed code to compute synthetic spectra in 2D geometry allowing for the effects of rotation, we could match the broad absorptions observed in the 2001 April spectrum with a high projected rotational velocity of 190 ± 30 km/s. Our results show direct spectroscopic evidence, for the first time, that an LBV may rotate at a significant fraction of its break-up velocity. Thus, AG Car (and possibly other LBVs) is indeed close to the ΓΩ limit, as predicted by theoretical studies of LBVs.
Damineli Augusto
Groh Jose H.
Hillier Desmond John
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