The stratification in the envelope of SN 1987 A

Details The stratification in the envelope of SN 1987 A The stratification in the envelope of SN 1987 A

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241..347h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Nov. 15, 1989, p. 347-363.

Astronomy and Astrophysics

Astronomy

8

Absorption Spectra, Stellar Envelopes, Supernova 1987A, Balmer Series, Density Distribution, Photosphere, Stellar Atmospheres, Stellar Evolution

Scientific paper

Measurements of the absorption trough velocities in P Cygni-type and absorption-line profiles in SN 1987 A during the first 111 days, are compared with the corresponding velocities at the photosphere. The expanding envelope shows a considerable stratification: strongest absorption in prominent lines occurs at radii 2.5-4 times larger than the photospheric radius, while weaker lines show radii of maximum absorption coinciding with the photosphere. Absorption lines, as well as the photosphere, are found to show certain distinct phases of velocity evolution, reflecting both the slope of the initial density law and changes in excitation or ionization conditions.

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