Astronomy and Astrophysics – Astronomy
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....49...57g&link_type=abstract
Astronomy and Astrophysics, vol. 49, no. 1, May 1976, p. 57-79. Translation.
Astronomy and Astrophysics
Astronomy
563
Astronomical Models, Galactic Rotation, Galactic Structure, H Alpha Line, H Ii Regions, Milky Way Galaxy, Astronomical Maps, Hydrogen Ions, Kinematics, Radial Velocity, Radio Astronomy, Tables (Data), Visual Observation
Scientific paper
An attempt is made to establish a coherent scheme of the spiral structure of the Galaxy on the basis of a study of H II regions and their exciting stars. The data used for this include the distances of the exciting stars, H-alpha radial velocities, and H109-alpha radial velocities. A detailed model of galactic rotation is developed which exhibits deviations from circular motion in certain sectors, thus allowing the stellar and kinematic distances to be matched correctly. The resulting spiral pattern is found to have two symmetrical pairs of arms (four altogether) with a pitch angle of 12 deg. These are identified as the Sagittarius-Carina Arm (the major arm or arm No. 1), the Scutum-Crux Arm (the intermediate arm or arm No. 2), the Norma Arm (the internal arm or arm No. 1'), and the Perseus Arm (the external arm or arm No. 2'). It is concluded that the morphological type of the Galaxy is much closer to Sc than to Sb.
Georgelin Y. M.
Georgelin Y. P.
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