The velocity-age relation for B and A stars

Details The velocity-age relation for B and A stars The velocity-age relation for B and A stars

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..102p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 102-107.

Astronomy and Astrophysics

Astrophysics

24

A Stars, B Stars, Early Stars, Stellar Motions, Velocity Distribution, Error Analysis, Molecular Clouds, Star Distribution, Stellar Evolution

Scientific paper

Space velocity vectors of 2595 cataloged A and B stars were examined to detect any age-velocity relationships. Ages were estimated from absolute magnitude and effective temperature data. Only objects within 300 pc were considered, and the sample was further constrained to stars with space velocities within 60 km/sec of the sun's. No significant effects of velocity gradients or the galactic differential rotation were detected. B stars younger than 50 Myr and A stars from 400-600 Myr old displayed markedly distinctive velocities. Many of the stars younger than 50 Myr were located in Gould's Belt and were moving opposite to the direction of galactic rotation by about 9 km/sec. The overall velocity dispersion increased at ages from 0.2-1 Gyr, which has implications for stellar diffusion and the masses of giant molecular clouds.

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