2005A&A...441..271U


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST07:27:59

2005A&A...441..271U - Astronomy and Astrophysics, volume 441, 271 (2005/10-1)

Strong effects of time-dependent ionization in early SN 1987A.

UTROBIN V.P. and CHUGAI N.N.

Abstract (from CDS):

We study time-dependent hydrogen ionization in the atmosphere of SN 1987A during the first month after the supernova explosion. The model includes kinetics of hydrogen ionization and excitation, molecular hydrogen kinetics, and a time-dependent energy balance. The primary strong effect of the time-dependent ionization is the enhanced hydrogen ionization compared to the steady-state model. The time-dependent ionization provides a sufficient population of excited hydrogen levels to account for the observed Hα without invoking the external 56Ni. We find that the Ba II 6142Å line in SN 1987A can be reproduced for the LMC barium abundance. This resolves the long-standing problem of the unacceptably high barium overabundance in SN 1987A. The key missing factor responsible for the ``barium problem'' is the time-dependent ionization. The modelling of the Hα profile on day 4.64 indicates the ratio of the kinetic energy to the ejected mass ≃0.83x1050erg/M.

Abstract Copyright:

Journal keyword(s): stars: supernovae: individual: SN 1987A - stars: supernovae: general

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1
2 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4484 2
3 SN 1970G SN* 14 03 00.83 +54 14 32.8   11.8 11.50     SNIIL 199 1

    Equat.    Gal    SGal    Ecl

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2020.07.05-07:27:59

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