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Absolute Spectrophotometry of SN 1987A and the Hα Bochum Event

Published online by Cambridge University Press:  25 April 2016

Reinhard W. Hanuschik
Reinhard W. Hanuschik*
Affiliation:
Ruhr-Universität, Bochum, Federal Republic of Germany
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Abstract

Spectrophotometric optical fluxes of SN 1987A have been measured at high accuracy with the 61cm telescope equipped with a rapid spectrum scanner. This highly homogeneous data set covers the wavelength range 3200-8700Å at 10Å resolution. Selected wavelength regions, e.g. around Hα, have also been measured at 3Å resolution. The Hα line shows an undisturbed P Cygni-type profile until March 15, superimposed by variable fine-structure thereafter, developing within a few days into a blue-shifted, peak-like flux excess and a red-shifted flux deficiency. This fine-structure is intrinsic to Hα. Similar fine-structure is also observed in Na I-D, in Paschen-α and possibly in Hβ. We discuss our observations in terms of the ‘mystery spot’, and of models involving a jet and interactions with surrounding pre-existing material, and we propose density inhomogeneities, or occupation number deficits due to NLTE effects, within the inner regions of the envelope as origin.

Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 7 , Issue 4 , 1988 , pp. 446 - 449
Copyright
Copyright © Astronomical Society of Australia 1988

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