Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..307s&link_type=abstract
Astronomy and Astrophysics, vol. 56, no. 1-2, Apr. 1977, p. 307-309.
Astronomy and Astrophysics
Astrophysics
Cepheid Variables, Galactic Rotation, Interstellar Extinction, Spiral Galaxies, Stellar Motions, Astronomical Models, Data Reduction, Distance, Galactic Structure, Hydrogen Clouds, Interstellar Gas, Kinematics, Radial Velocity, Radio Signals, Velocity Distribution
Scientific paper
It is noted that Creze (1972) found a systematic variation of R (defined as the ratio of the interstellar-reddening factor to B-V color index) with galactic longitude and that spiral tracing of young objects shows systematic velocity deviations from circular rotation that would produce errors in an R that varied with longitude. To determine what effect these deviations would have on the values of R determined by Creze, the kinematic distances and apparent optical distances of the nearer spiral arms of the Galaxy are compared at intervals of 10 deg around the sky. It is argued that Creze's observations could be accounted for without postulating a variation of R with galactic longitude. Instead, it is suggested that systematic noncircular motion of spiral-arm material would cause kinematic distances to be overestimated or underestimated, leading respectively to an underestimate or an overestimate of an otherwise constant R.
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