Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321l..21v&link_type=abstract
Astronomy and Astrophysics, v.321, p.L21-L24
Astronomy and Astrophysics
Astrophysics
13
Hr Car, Circumstellar Matter, Infrared: Stars, Mass-Loss
Scientific paper
We present mid-infrared imaging of the LBV HR Car and its surrounding nebula. The 10μm broad-band N image reveals a geometry which is not point symmetric with respect to the central star on an arcsecond scale. The 12.8μm narrow-band [NeII] image shows a clumpy structure which does not follow the N-band distribution. In addition, we detect a faint and probably clumpy outer nebula about 15" across. The morphology of the infrared nebula and in particular its asymmetry is not at all in agreement with the large-scale structures as seen in optical images. Three different episodes of shell ejection can now be distinguished for HR Car: the arc-like structures seen in the optical, about 35" across, the faint IR nebula seen in the N-band, about 15" across, and the small, irregular nebula less than 8" across. The main conclusion we draw from this is that the geometry of mass-ejections in HR Car is highly time-dependent and that multiple shell ejections can occur in LBVs. The distance of the small IR nebula from the central star can be well explained by a dust shell that is composed of silicates and is in radiative equilibrium with the central star.
Kaeufl Hans Ulrich
Trams Norman. R.
Voors R. H. M.
Waters Laurens B. F. M.
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