Velocity-resolved far-infrared spectra of forbidden Fe II - Evidence for mixing and clumping in SN 1987A

Details Velocity-resolved far-infrared spectra of forbidden Fe II - Evidence for mixing and clumping in SN 1987A Velocity-resolved far-infrared spectra of forbidden Fe II - Evidence for mixing and clumping in SN 1987A

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..257h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 1, 1990, p. 257-266.

Astronomy and Astrophysics

Astronomy

72

Far Infrared Radiation, Infrared Sources (Astronomy), Infrared Spectra, Metallicity, Stellar Models, Supernova 1987A, Forbidden Transitions, Iron, Line Spectra, Velocity Distribution

Scientific paper

The forbidden F II profiles at 18 and 26 micron from SN 1987A have been measured with a resolution of about 400 km/s. The central portion of each profile is well-fitted by a Gaussian with a FWHM of 2900 and 2500 km/s, respectively. The centroid velocity is redshifted relative to the LSR by 450 + or - 200 km/s at 18 microns and by 680 + or - 200 km/s at 26 microns. The integrated line fluxes alone imply a maximum expansion velocity of about 2000 km/s and a minimum expansion velocity much less than the maximum. A significant fraction of the iron has mixed with the overlying hydrogen regions. There is a high-velocity emission feature at about +3500 km/s relative to the main emission peak which contains about 3 percent of the total iron mass and has T about 2600 K. The measured 26 micron line flux corresponds to a total singly ionized iron mass of 0.026 solar. The line fluxes and profiles are inconsistent with a physically thin shell of gas and show that there is a wide range of expansion velocities for the iron.

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