Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337l..13p&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 337, Feb. 1, 1989, p. L13-L17.
Astronomy and Astrophysics
Astronomy
7
Stellar Coronas, Stellar Envelopes, Supernova 1987A, Brightness Distribution, Charge Coupled Devices, Sky Surveys (Astronomy), Stellar Luminosity
Scientific paper
A coronagraph with broad-band B and R filters was used to image a 23 x 36 arcsec region centered on SN 1987A with a resolution of 0.8 arcsecs about 300 days after eruption to search for evidence of a light echo from circumstellar dust. All of the identifiable sources of radiation in these bands in the region corresponded to objects observed before the eruption. A stringent upper limit of 22.5 mag/sq arcsec is set on the B-band brightness of an echo-like, largely azimuthally symmetric feature located anywhere between 4 arcsecs from the supernova out to the edge of the observed field. This implies an upper bound of 10 to the 18th H atoms/cu cm to the column density of any circumstellar shell of gas of average galactic properties located on the ellipsoid of equal delay points between about 2 and 20 pc from the supernova.
Burrows Christopher
Paresce Francesco
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