The H-alpha echoes of Eta Carinae from 1985 to 1997

Details The H-alpha echoes of Eta Carinae from 1985 to 1997 The H-alpha echoes of Eta Carinae from 1985 to 1997

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294...61b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 294, p. 61

Astronomy and Astrophysics

Astronomy

6

H Alpha Line, Blue Stars, Variable Stars, Massive Stars, Nebulae, Time Dependence, Echelle Gratings

Scientific paper

Spatially resolved, broad H-alpha line profiles from both the luminous blue variable star Eta Carinae (Eta Car) and the surrounding filamentary Car II ('Keyhole') nebula, where they have been scattered and reflected by dust, have been observed periodically from 1985 to 1997. The He-alpha line profiles from Eta Car in this 12-yr period show some, albeit not dramatic, changes. The sharp and deep P Cygni-type absorption feature that was observed first in 1985 in the broad, scattered/reflected profiles from the surrounding Keyhole nebula is not present in any of the direct Eta Car profiles. This distinctive feature is now shown to be spatially variable over the Keyhole nebula and most prominent along the direction of the axis of the bipolar Homunculus nebula at PA 132 deg. No evidence of any temporal variability of this sharp feature has been found in 12 yr of monitoring, even from the most well-defined scattering/reflecting cloud along PA 132 deg. It is concluded that a 46-deg-wide cone of light from Eta Car is relatively unobscured along the axis of the Homunculus nebula and that this must be the consequence of a dense torus close to the star.

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