Observation of SN 1987A with the gamma-ray spectrometer HEXAGONE

Details Observation of SN 1987A with the gamma-ray spectrometer HEXAGONE Observation of SN 1987A with the gamma-ray spectrometer HEXAGONE

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403..332c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 403, no. 1, p. 332-335.

Astronomy and Astrophysics

Astrophysics

6

Balloon-Borne Instruments, Gamma Ray Spectra, Supernova 1987A, Spectrometers, Stellar Mass Ejection, Stellar Models

Scientific paper

The HEXAGONE balloon-borne spectrometer was flown from Alice Springs (Australia) on 1989 May 22. HEXAGONE is a high-resolution gamma-ray spectrometer and consists of an array of twelve cooled germanium detectors. One of the observed targets was the supernova 1987A and it was seen during 9.9hr, 818 days after the initial optical outburst. No significant hard X-ray or gamma-ray emission is detected in the final spectrum of SN 1987A. We report the upper limits of the flux values for the gamma-ray lines coming from the decay of radionuclides synthesized in this star such as Co56, Co-57, or Ti-44. The results are consistent with models incorporating mixing of the radioactive nuclei in the ejecta, 0.073 solar mass of Co-56, 3.1 10 exp -3 solar mass of Co-57, and 1.2 10 expo -4 solar mass of Ti-44.

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