Other
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367l..15k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. L15-L17. Research supported by the Smithso
Other
4
Astrometry, Galactic Structure, Magellanic Clouds, Speckle Interferometry, Supernova 1987A, Astronomical Models, Astronomical Spectroscopy, Diameters, Power Spectra, Stellar Luminosity, Supernovae
Scientific paper
Speckle interferometric measurements of the angular diameter of SN 1987A in the Large Magellanic Cloud, obtained at 664 days after the outburst are presented. Diameters were estimated with milliarcsec precision at 657 nm and 550 nm by fitting model visibility functions to the data corresponding to different intensity distributions for the supernova disk. Measurements made assuming a uniform intensity distribution were compared to the uniform disk measurements obtained from 30 days after the explosion. Diameter measurements obtained near the center of the H-alpha line are consistent with homologous expansion of the supernova shell with a mean velocity of 2850 km/s. The linear least-squares fit to the measurements obtained at other wavelengths from 260 days after the explosion yielded a somewhat lower mean expansion velocity.
Heathcote Steve R.
Karovska Magarita
Nisenson Peter
Standley Clive
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