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2008MNRAS.387..564T - Mon. Not. R. Astron. Soc., 387, 564-576 (2008/June-3)
Near-infrared integral field spectroscopy of the Homunculus nebula around η Carinae using Gemini/cirpass.
TEODORO M., DAMINELI A., SHARP R.G., GROH J.H. and BARBOSA C.L.
Abstract (from CDS):
We confirmed the claim of N. Smith and showed that the spatial extent of the Little Homunculus matches remarkably well the radio continuum emission at 3 cm, indicating that the Little Homunculus can be regarded as a small HII region. Therefore, we used the optically thin 1.3 mm radio flux to derive a lower limit for the number of Lyman-continuum photons of the central source in η Car. In the context of a binary system, and assuming that the ionizing flux comes entirely from the hot companion star, the lower limit for its spectral type and luminosity class ranges from O5.5iii to O7i. Moreover, we showed that the radio peak at 1.7 arcsec NW from the central star is in the same line-of-sight of the `Sr-filament' but they are obviously spatially separated, while the blue-shifted component of Heiλ10830 may be related to the radio peak and can be explained by the ultraviolet radiation from the companion star.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): stars: general - stars: individual: η Carinae - circumstellar matter - reflection nebulae
Simbad objects: 5
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