The Hα echoes of ε Carinae from 1985 to 1997 |
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| Authors: | Boumis Meaburn Bryce & López |
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| Institution: | Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL,;Instituto de Astronomia, UNAM, Apdo. Postal 877. Ensenada, Baja California, 22800, Mexico |
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| Abstract: | Spatially resolved, broad Hα line profiles from both the luminous blue variable star ε Carinae (ε 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 Hα line profiles from ε 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 ε 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°. 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°.
It is concluded that a 46°-wide cone of light from ε 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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| Keywords: | line: profiles stars: individual: ε Car stars: variables: other |
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