The outflowing dust around Eta Carinae

Details The outflowing dust around Eta Carinae The outflowing dust around Eta Carinae

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..283m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 283-293.

Astronomy and Astrophysics

Astrophysics

42

Light Scattering, Nebulae, Polarized Electromagnetic Radiation, Stellar Evolution, Stellar Spectra, Astronomical Models, Astronomical Spectroscopy, Cosmic Dust, Red Shift

Scientific paper

Spectropolarimetric observations with the Manchester Echelle Spectrograph have been obtained of the H-beta profiles from the Homunculus nebula surrounding Eta Carinae. The polarized line profiles at eight positions are combined with previous H-alpha profiles and H-alpha spectropolarimetry to study the outflowing dust from Eta Car. The polarization profiles are complex and alter with position over the Homunculus. Polarization up to 30 percent is found over the H beta profiles and is highest in the red wing of the line profile and in the northwestern lobe which is tilted away from the observer. Scattering by dust with an outflow velocity of about 650km/s is invoked to explain the flux and polarization profiles. The principal features of the polarization profiles can be modeled by silicate grains in the walls of two hollow homologously-expanding cavities and tilted by 33 deg with respect to the plane of the sky.

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