Spectroscopic and photometric observations of SN1987A. VI - Days 617 to 792

Details Spectroscopic and photometric observations of SN1987A. VI - Days 617 to 792 Spectroscopic and photometric observations of SN1987A. VI - Days 617 to 792

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240p...7w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 7P-24P.

Astronomy and Astrophysics

Astronomy

54

Astronomical Photometry, Astronomical Spectroscopy, Radioactive Decay, Spectrum Analysis, Supernova 1987A, Cobalt, Interstellar Matter, Neutrinos, Stellar Mass Ejection, Stellar Spectra, Supernova Remnants

Scientific paper

The paper presents spectroscopic and UBV(RI)cJHKLM photometric observations of SN1987A in the Large Magellanic Cloud made between days 617 and 792 after the Kamiokande-II neutrino e vent. During the period from day 520 to day 630 the U to M bolometric flux went through a very steep decline, returning after day 670 to the same decline rate as before day 500. Various explanations for these changes are examined. The addition of the supernova output at high energies (derived from models of X-ray and gamma-ray data) to that from the U to M spectral region leaves a deficit from the predicted radioactive decay energy after day 500. This deficit can apparently be accounted for if the far-infrared dust emission is also added to the energy budget. There is no compelling evidence for the presence of any additional energy source, such as a pulsar, during this period. However, the errors on the total luminosity are sufficiently high that the presence of a source radiating at a level less than 10 to the 38th ergls can not be excluded.

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