Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..435k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 435-442. Research supported by the Smithsonian Institu
Astronomy and Astrophysics
Astrophysics
15
Astrometry, Astronomical Photometry, Magellanic Clouds, Speckle Interferometry, Supernova 1987A, Angular Resolution, H Alpha Line, High Resolution, Telescopes
Scientific paper
Direct measurements are given of the angular diameter of SN 1987A in the LMC made from high-angular resolution observations at the CTIO 4 m telescope in five observing runs from April 1987 to April 1988. Diameters were determined to milliarcsecond precision from integrated power spectra, using speckle interferometric data. The accuracy of the technique was evaluated by laboratory experiments and measurements of the diameters of several stars of known angular size. The SN 1987A diameters measured near the center of the H-alpha line show clear evolution during this period. The rate at which the supernova size changed at this wavelength corresponds to 2850 km/s mean velocity of expansion. Diameter measurements obtained in several spectral lines and in the continuum indicate stratification of the expanding envelope of the supernova. Our continuum data yield diameters substantially larger than those calculated from photometric measurements and a blackbody fit to the observed spectra.
Karovska Magarita
Koechlin Laurent
Nisenson Peter
Papaliolios Costas
Standley Clive
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