Variable Unidentified Emission Near 6307 AA in Eta Carinae
J. C. Martin, K. Davidson, F. Hamann, O. Stahl, K. Weis
 School of Physics & Astronomy, University of Minnesota;  Dept of Astronomy, University of Florida;  Landessternwarte Heildelberg, Konigsstuhl;  Astronomisches Institut, Ruhr-Universitat Bochum
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.
Reference: Accepted to appear in May 2006 PASP
Status: Manuscript has been accepted