Ionization freeze-out and barium problem in supernova 1987A

Details Ionization freeze-out and barium problem in supernova 1987A Ionization freeze-out and barium problem in supernova 1987A

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nuas.conf..136u&link_type=abstract

"In: Proceedings of the 11th Workshop on "Nuclear Astrophysics", Ringberg Castle, Tegernsee, Germany, February 11-16, 2002 / Wol

Astronomy and Astrophysics

Astrophysics

2

Supernova 1987A, Barium, Magellanic Clouds

Scientific paper

We have shown that in the atmosphere of SN 1987A level populations of hydrogen are mostly controlled by an ionization freeze-out and ion-molecular processes up to ~40 days. The ionization freeze-out effects are important for normal SNe II-P as well. The time dependent effects and the mutual neutralization between H- and H+ may result in a non-monotonic radial dependence of the Sobolev optical depth for Hα and then in a blue emission satellite of Hα observed in SN 1987A spectra at Bochum event phase. The relative abundance of molecular hydrogen n(H2)/n(H) ~ 10-4-10-3 is high enough for the photospheric phase of SN 1987A. We emphasize that the poor knowledge of the far UV radiation field in the envelope of SN 1987A still forbids a truly reliable estimate of the Ba abundance but well-constructed and tested models may improve this situation.

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