Runaway Stars and the Force Perpendicular to the Galactic Plane

Details Runaway Stars and the Force Perpendicular to the Galactic Plane Runaway Stars and the Force Perpendicular to the Galactic Plane

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..665l&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 665-668

Computer Science

1

Scientific paper

Motions of 32 Hipparcos stars with distances from the galactic plane between 400 and 3000 pc, ages less than 80 Myr and with known radial velocities have been studied. Of 25 stars younger than 40 Myr, 24 move out from the plane with velocity components perpendicular to the plane between 0 and 150 km/s. Obviously, these stars are runaway stars born in the galactic plane that have not yet reached their maximum distance from the plane. Assuming that the ejection from the plane took place soon after the birth of the star, the time it has taken the star to reach its distance from the plane must be close to the age of the star. The knowledge of the distance from the plane, the velocity at that distance and the time it has taken to reach that distance contains information about the gravitational force component perpendicular to the plane. This scheme complements the classical statistical methods for determining K_z to larger values of Z. The suitability of this method to determine the force perpendicular to the galactic plane, and thereby the projected surface density in the plane, is discussed. Such considerations may also have implications concerning the nature of the runaway star phenomenon.

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