Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..487r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 193, Nov. 1980, p. 487-494.
Astronomy and Astrophysics
Astronomy
9
Interstellar Gas, Radio Astronomy, Centimeter Waves, H Ii Regions, Stellar Winds, Synthetic Apertures
Scientific paper
Aperture synthesis observations of two large expanding H I shells in the field of the H II regions NGC 7538 and S 159 are presented. Observations at a wavelength of 21 cm were obtained with the Half-Mile Telescope of the Mullard Radio Astronomy Observatory covering a range in velocity of between +5 and -85 km/sec. At a velocity near 0 km/sec, an H I feature identified as part of the large, expanding spherical shell related to the Cep OB3 association is observed. Data show the shell to be less than 0.5 pc thick in places and consistent with a type II supernova remnant with an age of 430,000 years and an initial energy of 1.2 x 10 to the 51st erg. A second expanding spherical shell is observed at a velocity of -35 km/sec, which is larger and at a greater distance than the Cep OB3 shell. It is found to contain 10,000 solar masses of hydrogen expanding at 15 km/sec and may be an old (approximately 1.6 million years) supernova remnant, or be produced by stellar winds from some unknown association.
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