OB star distances and the rotation curve of the outer Galaxy

Details OB star distances and the rotation curve of the outer Galaxy OB star distances and the rotation curve of the outer Galaxy

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222...85h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 85-88.

Astronomy and Astrophysics

Astrophysics

5

B Stars, Early Stars, Galactic Rotation, Milky Way Galaxy, O Stars, Stellar Structure, Angular Velocity, Dark Matter, H Ii Regions, Molecular Clouds, Velocity Distribution

Scientific paper

Using published ZAMS-models for OB stars it is shown that a galactic metallicity gradient introduces significant systematic errors to the stellar distances and hence the rotational velocities. As a result, the true rotation curve of the outer Galaxy may be flat, thus requiring a smaller contribution of dark matter to the galactic potential than inferred from the steep rise of the observed rotation curve.

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