Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...273..153k&link_type=abstract
Astronomy and Astrophysics, Vol.273, NO. 1/JUNI, P. 153, 1993
Astronomy and Astrophysics
Astrophysics
25
Scientific paper
, Implications of the detection of γ-rays from the ^57^Co decay in SN 1987A are discussed. The ^57^Co/^56^Co ratio is compared with the composition distribution in the explosion model to infer the neutron star mass and the explosion mechanism. As an energy source of the light curve, radioactive decays of ^57^Co and ^44^Ti could still be possible if the ^44^Ti/^56^Ni ratio is larger than 1.8 times the solar ^44^Ca/^56^Fe ratio. This interpretation with enhanced ^44^Ti is less favored by the current nucleosynthesis models but can be tested with the future INTEGRAL experiments. A pulsar with luminosity of ~0.2 - 1 x 10^37^ ergs s^-1^ at 1 keV - 10 MeV would also be a plausible energy source. This interpretation leads to a prediction that ASUKA (ASCA) may be able to observe X-rays from the pulsar at 6 - 10 keV ~ 2 years after the launch.
Hashimoto Makoto
Itoh Makoto
Kumagai Shiomi
Nomoto Ken
Shigeyama Toshikazu
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