Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276l..21m&link_type=abstract
Astronomy and Astrophysics, Vol.276, NO. 1/SEPI, P. L21, 1993
Astronomy and Astrophysics
Astrophysics
28
Η Carinae - Lines: Profiles - Stars: Circumstellar Matter
Scientific paper
The jet-like feature which points away from the extremely luminous star η Carinae out to a prominent ionized knot has now been successfully imaged with the New Technology Telescope (NTT). Moreover, high dispersion, spatially resolved measurements of the profiles of its emission lines with the Manchester echelle spectrometer on the Anglo Australian telescope (AAT) and the EMMI spectrometer on the NTT confirm that it has many of the characteristics expected of a true interstellar jet; it is emerging along the minor axis of the surrounding nebulosity at ≍ 1400 km s-1 away from η Car yet exhibits a velocity dispersion of only 40 km s-1 and is bright in the light of the low ionization [NII]6584Å emission line.
One possible model has the ionized knot as the working surface of the jet's interaction with ambient gas for the knot has an electron density of 4200 cm-3and a measured velocity of 1374 km s-1 from η Car at an angle of 27° to the plane of the sky. Alternatively, both the knot and the jet-like feature could be working surfaces of shocks driven into separate `bullets' of an unseen episodic jet.
Bryce Myfanwy
Gehring GA
Lopez Jose Alberto
Meaburn John
Palmer J. W.
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