view Abstract Citations (10) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Speckle Interferometry of SN 1987A up to One Year after Explosion Wood, P. R. ; Nulsen, P. E. J. ; Gillingham, P. R. ; Bessell, M. S. ; Dopita, M. A. ; McCowage, C. Abstract Speckle interferometric observations of SN 1987A have been obtained at Hα with the Anglo-Australian telescope on 1987 December 12-13 and 1988 February 10, days 292-293 and 352, respectively, after the explosion of the supernova. Uniform disk angular diameters of 23.1 +/- 1.6 and 23.9 +/- 0.9 mas, respectively, were obtained near line center on these two dates, corresponding to mean expansion velocities since explosion of 3300 and 2900 km s^-1^. A diameter measurement at the wavelength of the [S II] doublet {lambda]λ6716, 6731, which lies on the red wing of the Hα line at a redshift of 10,000 km s^-1^, yields the larger diameter of 30.6 mas. No point source brighter than ~ 3.6 mag fainter than the supernova at Hα was found within a 0.35" radius of SN 1987A on 1987 December 12-13; on 1988 February 10 the corresponding limits were ~ 4.8 mag fainter than the supernova within a 0.43" radius. We discuss the early reports of the detection of a "mystery spot" near SN 1987A. Publication: The Astrophysical Journal Pub Date: April 1989 DOI: 10.1086/167361 Bibcode: 1989ApJ...339.1073W Keywords: Binary Stars; Speckle Interferometry; Supernova 1987a; Autocorrelation; H Alpha Line; Point Sources; Red Shift; Astrophysics; INTERFEROMETRY; STARS: BINARIES; STARS: INDIVIDUAL ALPHANUMERIC: SN 1987A; STARS: SUPERNOVAE full text sources ADS | data products SIMBAD (4) NED (2)