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Preprint 01/01

Identification of the 4486, 4504 Å emission lines in O-type spectra

K. Werner and T. Rauch

Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany

To appear in: T. Gull, S. Johansson, and K. Davidson (eds.): Eta Carinae and Other Mysterious Stars. ASP Conference Series, Vol. XXX (2001)

Abstract. Inspired by an appeal to the community from Walborn (these proceedings) we decided to solve the long-standing problem concerning the nature of the 4486, 4504 Å emission lines, which are frequently observed in O-type spectra and which are particularly prominent in supergiants. We claim that these lines emerge from sulfur, namely by de-excitation of a highly excited SIV doublet state. We prove this by an exploratory NLTE calculation with a detailed model atom.

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Paper (65k gzip'ed Postscript including figures)

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