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Title:
The evolution of the radio emission from Kepler's Supernova remnant
Authors:
Dickel, John R.; Sault, Robert; Arendt, Richard G.; Korista, Kirk T.; Matsui, Yutaka
Affiliation:
AA(Illinois, University, Urbana), AB(Illinois, University, Urbana), AC(Illinois, University, Urbana), AD(Illinois, University, Urbana), AE(Northwestern University, Evanston, IL)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 254-263. (ApJ Homepage)
Publication Date:
07/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
RADIO EMISSION, RADIO SOURCES (ASTRONOMY), STELLAR ENVELOPES, STELLAR RADIATION, SUPERNOVA REMNANTS, VERY LARGE ARRAY (VLA), DENSITY DISTRIBUTION, HIGH RESOLUTION, STELLAR MASS EJECTION
DOI:
10.1086/166469
Bibliographic Code:
1988ApJ...330..254D

Abstract

High-resolution radio maps of Kepler's Supernova remnant (SNR) using all four arrays of the VLA have been obtained at wavelengths of 20 and 6 cm. They show the complete structure of the remnant; all features are resolved with sizes greater than about 2 arcsec, and the relative brightness of the smooth component near the center is about 1/4 the brightness of the rim. The results have been compared with earlier more limited data to measure changes in the remnant over a four-year time span. The SNR is expanding with a mean rate of R proportional to t exp 0.50 with considerable variations around the shell. Values range from R proportional to t exp 0.35 on the bright northern rim to R proportional to t exp 0.65 on the eastern part of the shell. The measurements are consistent with expansion into a variable circumstellar medium.

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