The structure of the inner nebula (Homunculus) of Eta Carinae - Broad band and interference filter imaging

Details The structure of the inner nebula (Homunculus) of Eta Carinae - Broad band and interference filter imaging The structure of the inner nebula (Homunculus) of Eta Carinae - Broad band and interference filter imaging

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..595b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 2, Jan. 1991, p. 595-603.

Astronomy and Astrophysics

Astrophysics

13

Emission Spectra, Nebulae, Stellar Spectra, Coronagraphs, Interstellar Extinction, Stellar Envelopes, Stellar Spectrophotometry, Stars: Circumstellar Matter, Stars: Emission-Line, Stars: Individual (Η Carinae)

Scientific paper

We report new sub-arcsec observations of the η Carinae nebula taken with the coronograph of the STScI. The outer shell and the inner dense nebula, called the Homunculus, have been resolved by subtracting a varying background from the original images in the light of [N II] 6583 Å and through a V filter chosen in order that no major emission lines are in the passband. Comparison of the structure of the Homunculus with published infrared maps after image-restoration shows a very similar overall bipolar shape. A BVRI and Hβ, [O III] 5007 Å, Hα and [N II] 6583 Å photometry has also been carried out. The mean colors-of the knots belonging_to the Homunculus_appear to be rather homogeneous around B-V = 0.09 and R-I = 0.15. The West and the South condensations have very high [N II] 6583/Hα ratio, in accord with the X-ray emission, suggesting that these features are shock ionized. The entire outer shell shows high n(N+)/n(H+) and low n(O2+)/n(H+) confirming most of the CNO is nitrogen.

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