On the origin of intermediate-latitude OB stars

Details On the origin of intermediate-latitude OB stars On the origin of intermediate-latitude OB stars

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67..421h&link_type=abstract

Astronomy and Astrophysics, vol. 67, no. 3, July 1978, p. 421-429.

Astronomy and Astrophysics

Astrophysics

23

Astrodynamics, Early Stars, Stellar Evolution, Stellar Motions, Astronomical Catalogs, B Stars, O Stars, Radial Velocity, Star Distribution

Scientific paper

An attempt is made to trace the origin of early-type stars observed at appreciable distances from the galactic plane. Because uncertainties in the proper motions make space motions and hence dynamical lifetimes rather inaccurate, a theory of oscillations normal to the plane has been used to compute radial velocities for 138 intermediate-latitude OB stars. These theoretical values are then compared with the observed radial velocities, and it is found that the low-velocity stars were probably ejected from the plane some time after formation, while the high-velocity stars were ejected very soon after formation. Velocities of ejection perpendicular to the plane are computed and show a narrow distribution with a mean absolute value of 7 km/s together with a spread of velocities from about 40 to over 200 km/s. The data are in reasonable agreement with a 'sling' effect and 'runaway' origin for the stars in the sample.

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