The hydrodynamic motions of OB stars

Details The hydrodynamic motions of OB stars The hydrodynamic motions of OB stars

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..245q&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 2, Nov. 1983, p. 245-253. Research supported by the Financiadora de E

Astronomy and Astrophysics

Astrophysics

3

B Stars, Early Stars, Hydrodynamic Equations, O Stars, Stellar Motions, Stellar Evolution, Stellar Oscillations, Velocity Distribution

Scientific paper

Predominantly hydrodynamic motions are noted for the z-coordinate motion component of 403 OB stars at distances r smaller than 630 pc. The observed sigma(r) pattern is interpretable as hydrodynamic oscillations in the velocity field, and the size of the field, at 1200 pc, is similar to the length of the fine features of the spiral arms. The negative excess value of the distribution of the nearest zone, however, indicates that the actual distribution lacks high velocities by comparison with a normal Gaussian distribution. This is interpreted as due to the fact that the velocity pattern of these stars is still similar to the hydrodynamic pattern of the gas where they were born. The excesses become positive and grow with distance r with increasing zone size, in keeping with hydrodynamic motions which grow with zone size as predicted by the Helmholtz theorem.

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