Variable Unidentified Emission Near 6307 AA in Eta Carinae

Abstract

We have discovered a conspicuous unidentified variable feature near 6307 AA in the spectrum of Eta Carinae which is spatially unresolved from the central star and its wind (r < 200--300 AU). It is significant for two reasons: such prominent unidentified lines are now rare in this object, and this feature varies strongly and systematically. It exhibits a combination of characteristics which, so far as we know are unique in Eta Carinae's spectrum. It may provide insights into the recurrent spectroscopic events and the star's long-term brightening.

arXiv comment22 pages, 7 Figures, 3 Tables; Accepted PASP, appearing May 2006

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• The Chrysalis Opens? Photometry from the Eta Carinae HST Treasury Project, 2002-2006
• The Orientation of the Eta Carinae Binary System
• Modelling the Radio Light Curve of Eta Carinae
• Accretion onto the Companion of Eta Carinae During the Spectroscopic Event. IV. the Disappearance of Highly Ionized Lines
• Mid-Cycle Changes in Eta Carinae
• Prediction for the He I 10830A Absorption Wing in the Coming Event of Eta Carinae