Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...45..193p&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 45, Aug. 1981, p. 193-205. In French.
Astronomy and Astrophysics
Astrophysics
8
B Stars, Galactic Structure, Milky Way Galaxy, O Stars, Astronomical Catalogs, Galactic Rotation, H Ii Regions, Photographic Plates, Radial Velocity
Scientific paper
Galactic structure and rotation in the region of the Puppis OB 1 and OB 2 associations are investigated on the basis of spectrophotometric and kinematic observations. Data was obtained from measurements of plates taken at the ESO objective prism astrograph at a spectral dispersion of 110 A/mm. Spectral types, B magnitudes, distance moduli and galactocentric distances are presented for 102 stars, including 74 of types O5 through B3 and the remainder of types B5 and B6, and radial velocities determined by Fehrenbach's method as well as derived circular velocities are presented for 63 OB stars. The results demonstrate the reality of the Pup OB 1 association, which is found at a distance modulus of 12.20 with a mean radial velocity of 37 km/sec. The physical reality of the Pup OB 2 association, however, appears doubtful, due to the spread of the more distant group of OB stars (distance modulus 13.45, mean radial velocity 57 km/sec) over a distance of more than 3 kpc; this more distant group, as well as the H II region S 311, are assigned to an extension of the Perseus arm. The galactic rotation curve derived is found to exhibit a clear rise for galactocentric distances greater than 12.5 kpc.
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