Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..259s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 259-265.
Astronomy and Astrophysics
Astronomy
13
Astrometry, Astronomical Spectroscopy, Celestial Mechanics, Nebulae, Supernova Remnants, Astronomical Maps, Digital Data, H Alpha Line, Radial Velocity, Sky Surveys (Astronomy)
Scientific paper
An optical image in H-alpha + forbidden line N II of the central nebulosity of the peculiar supernova remnant CTB 80 obtained in 1981 has been compared with the red Palomar Sky Survey plate from 1953. The data were digitized and aligned in both position and intensity to a high degree of accuracy. The comparison shows significant changes in one filament which are consistent with outward motion and brightening during the interval of 28 years. In addition, there are smaller changes suggesting an overall expansion of the entire nebular region. If this interpretation is correct and the motion has been uniform, an age of 560 + or - 190 years is implied for the central, flat spectrum component of CTB 80. Typical expansion velocities are expected to be in the range 600 to 1100 km/s. The energetics implied by these observations, and how the nebulosity may be related to features in the radio and X-ray emission, are discussed.
Blair William Patrick
Strom Richard G.
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