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Issue A&A
Volume 426, Number 2, November I 2004
Page(s) 547 - 553
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20040570



A&A 426, 547-553 (2004)
DOI: 10.1051/0004-6361:20040570

Optical and near infrared observations of SN 1998bu

J. Spyromilio1, R. Gilmozzi1, J. Sollerman2, B. Leibundgut1, C. Fransson2 and J.-G. Cuby3

1  European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
    e-mail: [jspyromi;rgilmozz;bleibundgut]@eso.org
2  Stockholm Observatory, Albanova, 106 91 Stockholm, Sweden
    e-mail: [jesper;claes]@astro.su.se
3  Laboratoire d'Astrophysique de Marseille, BP 8, 13379 Marseille Cedex 12, France
    e-mail: jean-gabriel.cuby@oamp.fr

(Received 31 March 2004 / Accepted 5 July 2004)

Abstract
Infrared and optical spectra of SN 1998bu at an age of one year after explosion are presented. The data show evidence for the radioactive decay of 56Co to 56Fe, long assumed to be the powering source for the supernova light curve past maximum light. The spectra provide direct evidence for at least 0.4 solar masses of iron being present in the ejecta of the supernova. The fits to the data also show that the widths of the emission lines increase with time. Photometric measurements in the H-band show that the supernova is not fading during the observation period. This is consistent with theoretical expectations.


Key words: stars: supernovae: general -- stars: supernovae: individual: SN 1998bu

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© ESO 2004


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