Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980azh....57..975b&link_type=abstract
(Astronomicheskii Zhurnal, vol. 57, Sept.-Oct. 1980, p. 975-984.) Soviet Astronomy, vol. 24, Sept.-Oct. 1980, p. 559-564. Trans
Astronomy and Astrophysics
Astronomy
Astronomical Models, Galactic Structure, Orion Constellation, Spiral Galaxies, Star Distribution, Statistical Analysis, Early Stars, Milky Way Galaxy, Star Clusters, Stellar Magnitude
Scientific paper
A method based on statistical modeling techniques is developed for the investigation of spiral structure. The method is applied to the Orion spiral arm of the Galaxy by using functions N(m) that express the number of stars brighter than apparent magnitude m. Catalog data on stars of all spectral types are employed to determine the distance of the density maximum and the width of the Orion arm with respect to seven star fields in the galactic plane. The results confirm that the sun is situated at the inner edge of the Orion arm and that the bend observed in the arm near 65 deg galactic longitude may be a real effect. A comparison of the results with the positions of young OB2 associations indicates that the Orion arm has a larger width for all stars combined than for only young objects.
Basharina T. S.
Filippova A. A.
Pavlovskaya E. D.
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