Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..411b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, March 1984, p. 411-416.
Astronomy and Astrophysics
Astronomy
10
Distance, Interstellar Matter, Stellar Spectra, Supernova Remnants, Absorption Spectra, Centimeter Waves, Gas Density, Interstellar Extinction, Line Spectra
Scientific paper
Observations of interstellar absorption lines in the spectra of five stars in the direction of Tycho's Supernova Remnant are presented. The profiles show significant absorption at large negative velocities, - 50 to - 60 km/s (LSR). This information, together with the distances of the background stars, permits limiting distances to be assigned to the corresponding velocity components in the H I 21-cm line absorption spectrum of the supernova remnant itself. The 21-cm absorption line data for Tycho's Supernova Remnant are entirely consistent with a distance as small as 2 kpc. Distances based upon simple kinematic models of galactic rotation can be confused by well-known noncircular motions in this direction. The interstellar line data also reveal a relatively high column density of CO toward HD 108.
Black John Harry
Raymond John C.
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