Direct Observation of Radioactive Cobalt Decay in Supernova 1987A

Details Direct Observation of Radioactive Cobalt Decay in Supernova 1987A Direct Observation of Radioactive Cobalt Decay in Supernova 1987A

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..570v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 245, NO. 1/JUL1, P. 570, 1990

Astronomy and Astrophysics

Astronomy

49

Scientific paper

The presence and decay of radioactive cobalt in the ejecta of supernova 1987A are inferred from the [Co II] 1.547-micron line which was observed between days 255 and 576 after the explosion. The cobalt/iron abundance ratio and its temporal behaviour are obtained by examination of the relative strengths of near-infrared spectral lines. This has the advantages of being relatively insensitive to uncertainties in temperature, A-values and optical depths. The presence of both ^56^Co and ^57^Co is revealed. This work provides the earliest evidence of ^57^Co in the ejecta of SN 1957A. The abundance ratios are found to be consistent with the predictions of explosive nucleo-synthesis calculations, and constrain the ultimate ^57^Fe/^56^Fe abundance ratio to between one and two times solar.

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