Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-25T00:37:29.206Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Chalabaev, A.A., Cristiani, S. 1987, in Proc. ESO Workshop on SN 1987A, ed. Danziger, I.J., (Garching) p.655.Google Scholar
Filippenko, A., Sargent, W.L.W. 1986, Astron. J. 91, 691.Google Scholar
Hanuschik, R.W. 1988, submitted to Astron. Astrophys.Google Scholar
Hanuschik, R.W., Dachs, J. 1987a, Astron. Astrophys. 182, L29.Google Scholar
Hanuschik, R.W., Dachs, J. 1987b, in Proc. ESO Workshop on SN 1987A, ed. Danziger, I.J., (Garching) p.153.Google Scholar
Hanuschik, R.W., Dachs, J. 1988, Astron. Astrophys. (in press).Google Scholar
Hanuschik, R.W., Thimm, G., Dachs, J. 1988, Mon. Not. R. Astron. Soc. (in press).Google Scholar
Haupt, W., Desjardins, R., Maitzen, H.M., Rudolph, R., Schlosser, W., Schmidt-Kaler, T., Tüg, H. 1976, Astron. Astrophys. 50, 85.Google Scholar
Höflich, P. 1988, in Proc. Workshop “SN 1987A, One Year Later”, La Thuile (in press).Google Scholar
Kirshner, R.P., Kwan, J. 1974, Astrophys. J. 193, 27 Google Scholar
Larson, H.P., Drapatz, S., Mumma, M.J., Weaver, H.A. 1987, in Proc. ESO Workshop on SN 1987A, ed. Danziger, I.J., Garching, p.147 Google Scholar
Lucy, L.B. 1987, Proc. 4th George Mason University Workshop in Astrophysics, “Supernova 1987A in the LMC”, (submitted).Google Scholar
Matcher, S.J., Meikle, W.P.S., Morgan, B.L. 1987, IAU Circ. #4391; errata 1987, IAU Circ. #4394 and 4413.Google Scholar
Nisenson, P., Papaliolios, C., Karovska, M., Noyes, R. 1987, Astrophys. J. 320, 45.CrossRefGoogle Scholar
Piran, T., Nakamura, T. 1987, Nature 330, 28 Google Scholar
Rees, M.J. 1987, Nature 328, 207.CrossRefGoogle Scholar
Tüg, H. 1980a, Astron. Astrophys. 82, 195.Google Scholar
Tüg, H. 1980b, Astron. Astrophys. Suppl. Ser. 39, 67.Google Scholar
Williams, R.E. 1987, Astrophys. J. 320, L117.CrossRefGoogle Scholar