Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4215w&link_type=abstract
American Astronomical Society, HEAD Meeting #5, #42.15; Bulletin of the American Astronomical Society, Vol. 32, p.1257
Astronomy and Astrophysics
Astronomy
Scientific paper
The Luminous Blue Variable star η Car is one of the most massive stars known. It underwent a giant eruption in AD 1843 in which the Homunculus nebula was created. ROSAT and ASCA data indicate the existence of a hard and a soft X-ray component which appear to be spatially distinct: a softer diffuse shell of the Homunculus nebula and a harder point like source centered on η Car. Astonishingly the morphology of the X-ray emission is very different from the optical appearance of the nebula. We present a comparative analysis of optical morphology, the kinematics, and the diffuse soft X-ray structure of the Homunculus. Our kinematic analysis of the nebula shows extremely high expansion velocities. We find a strong correlation between the X-ray emission and the knots in the nebula with largest velocities, i.e. the X-ray morphology of the Homunculus is determined by the interaction between material streaming away from η Car and the ambient medium.
Bomans Dominik J.
Duschl Wolfgang J.
Weis Kerstin
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