Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339.1073w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 15, 1989, p. 1073-1077.
Astronomy and Astrophysics
Astrophysics
10
Binary Stars, Speckle Interferometry, Supernova 1987A, Autocorrelation, H Alpha Line, Point Sources, Red Shift
Scientific paper
Speckle interferometric observations of SN 1987A are obtained at H-alpha with the Anglo-Australian telescope on December 12-13, 1987 and February 10, 1988, days 292-293 and 352, respectively, after the supernova explosion. Uniform disk angular diameters of 23.1 plus or minus 1.6 and 23.9 plus or minus 0.9 mas, respectively, are obtained near line center on these two dates, corresponding to mean expansion velocities since explosion of 3300 and 2900 km/sec. A diameter measurement at the wavelength of the forbidden S II doublet lambda lambda 6716, 6731, which lies on the red wing of the H-alpha line at a redshift of 10,000 km/sec, yields the larger diameter of 30.6 mas. No point source brighter than approximately 3.6 mag fainter than the supernova at H-alpha is found within a 0.35 arcsec radius on days December 12-13, 1987; on February 10, 1988 the corresponding limits are approximately 4.8 mag fainter than SN 1987A within a 0.43 arcsec radius.
Bessell Michael S.
Dopita Mike A.
Gillingham Peter R.
McCowage Chris
Nulsen Paul E. J.
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