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Title:
The composite image of Sanduleak -69 deg 202, candidate precursor to supernova 1987 A in the Large Magellanic Cloud
Authors:
Walborn, Nolan R.; Lasker, Barry M.; Laidler, Victoria G.; Chu, You-Hua
Affiliation:
AA(Space Telescope Science Institute, Baltimore, MD), AB(Space Telescope Science Institute, Baltimore, MD), AC(Computer Sciences Corp., El Segundo, CA), AD(Illinois, University, Urbana)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. L41-L44. (ApJL Homepage)
Publication Date:
10/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Late Stars, Magellanic Clouds, Photointerpretation, Supergiant Stars, Supernovae, Blue Stars, Early Stars, Iue, Stellar Spectrophotometry
DOI:
10.1086/185002
Bibliographic Code:
1987ApJ...321L..41W

Abstract

The image of Sk -69 deg 202 has been analyzed on the basis of eight (of 32 available) CTIO 4-m prime-focus plates obtained in 1974-1983, covering wavelengths from blue through NIR. Density differences and intensity syntheses based upon reference stars from the same plates are presented. The 12th mag blue supergiant (star 1) has two companions with V magnitudes, position angles, and separations 15.3, 315 deg, and 3 arcsec (star 2) and 15.7, 115 deg, and 1.5 arcsec (star 3), respectively. Both companions appear to be early-type stars; there is no evidence for a very red star in the system. The two companions are capable in principle of producing the current IUE spatial and spectral results, consistent with the interpretation that star 1 has disappeared.

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