Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287l..69d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. L69-L71.
Astronomy and Astrophysics
Astrophysics
44
Balmer Series, Galaxies, Stellar Spectra, Stellar Spectrophotometry, Stellar Winds, Supernovae, Light (Visible Radiation), Photosphere, Stellar Mass Ejection
Scientific paper
Optical spectra of the Type II supernova in NGC 3169 were obtained near maximum light using the 3.9-m Anglo-Australian Telescope. A grating of 250 lines per mm in blue was used to give continuous wavelength coverage from 3400 to 7600 A. The spectra show a P Cygni structure in the Balmer lines. The high velocity component suggests a velocity of expansion of the photosphere of about 15,500 km/s while the helium lines give a velocity of 13,500 km/s. From the size of the Balmer discontinuity and the ratio of continuum fluxes at 4861 and 6563 A, a photospheric temperature of 15,500 (+ or - 1800) K is derived. The photospheric radius was at least 3 x 10 to the 14th cm. The narrow P Cygni profiles observed in H-alpha to H-delta indicate that the precursor star underwent a strong episode of mass loss just prior to the supernova event, and that the wind was outflowing at a velocity close to 3000 km/s at the time of observation.
Cohen Martin
Dopita Mike A.
Evans Robert
Schwartz Richard D.
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