Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..107m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 107-115.
Astronomy and Astrophysics
Astrophysics
28
B Stars, Galactic Structure, O Stars, Spatial Distribution, Stellar Motions, H Ii Regions, Star Clusters, Warpage
Scientific paper
Based on O-B stars, an optical counterpart of the large-scale warp of the H I gas layer in our Galaxy is investigated, from the point of view that the proper motion in galactic latitude of these stars enables the detection of the kinematic behaviour of the warp. The plane defined by the O-B stars concerned here appears to be inclined about 3° to the galactic plane outside the solar circle (R0 = 8.5 kpc), in a similar fashion to the H I layer. A selected set of the proper motions of about 350 O-B stars within 3 kpc from the sun is analyzed on the proper motion systems of N 30, FK4, and FK5. A remarkable difference in the kinematic behaviours of the warp appears between the old systems (N30 and FK4) and FK5-system. The results on the FK5-system show no meaningful systematic z-motion, even though the O-B star plane exterior to the solar circle is inclined. These kinematic behaviours of the warp can neither be inferred from the model of the oblique material flow nor from the concepts of the precessional stellar rings and of the bending oscillation of a stellar disk.
Miyamoto Manabu
Suzuki Sadaomi
Yoshizawa Masahito
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