Other
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207...53w&link_type=abstract
Astrophysical Journal, vol. 207, July 1, 1976, pt. 1, p. 53-58.
Other
21
Absorption Spectra, H Alpha Line, Interstellar Gas, Supernova Remnants, Gas Expansion, Interferometry, Nebulae, Stellar Evolution
Scientific paper
The paper reports on observations of interstellar absorption lines in the spectra of 25 stars near the Monoceros Loop. An absorption feature with a velocity of +69 km/s (with respect to the local standard of rest) is found in the spectrum of HD 47240, and an absorption feature with a velocity of -31 km/s is found in the spectrum of HD 47359. These features are attributed to high-velocity clouds accelerated by the supernova explosion that produced the Loop. Three low-velocity Ca II features are observed throughout the region. A mean expansion velocity of 50 km/s is derived for the Loop and shown to be in excellent agreement with that obtained previously from H-alpha interferograms. The data are compared with those for other supernova remnants, and it is found that the Monoceros Loop appears to be an extension of the age sequence extending from Vela XYZ through the Cygnus Loop and Shajn 147. It is concluded that the age of the Monoceros Loop is greater than 150,000 years.
Jacobsen Theodor S.
Wallerstein George
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