The Formation and Excitation of H_3(+) in SN 1987A

Details The Formation and Excitation of H_3(+) in SN 1987A The Formation and Excitation of H_3(+) in SN 1987A

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5708y&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #57.08; Bulletin of the American Astronomical Society, Vol. 26, p.953

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We construct a chemical model for the envelope of SN 1987A at day 192. It is found that the H and He ionization fractions are quite low and a significant amount of H_2 is formed. The H_3(+) density is about 10(-8) n_H. The dominant H_3(+) excitation mechanism is atomic hydrogen impact excitation. The H_3(+) vibrational population falls short of LTE, and we are able to use the H_3(+) spectrum to fit the observed 3-4microns spectrum of SN 1987A at day 192 quite well. Cooling is mainly through the OH rotational cooling. The temperature in the envelope at day 192 is probably between 1000 and 2000K. We conclude that interstellar H_3(+) has been found.

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