Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...133...31n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 133, no. 1, April 1984, p. 31-36.
Astronomy and Astrophysics
Astrophysics
4
Celestial Mechanics, Dwarf Stars, M Stars, Star Distribution, Stellar Motions, Astronomical Catalogs, Kinematics, Radial Velocity, Velocity Distribution
Scientific paper
The distribution of stars according to spectral type and luminosity class within 22 pc of the sun is calculated on the basis of the Luminosity Function. A total of approximately 5400 stars were found and the resulting new catalog of star populations was compared with previous catalogs. The quantity of M-type stars is determined to be 70.7 percent of all stars in the solar neighborhood. Central momenta of the local stellar velocity distribution are calculated up to the fourth order, and the influence of added stars on the local galactic kinematics is studied. The values obtained for the solar motion with respect to the kinematic local standard of rest are: 4.7 (+ or - 0.5), 8.9 (+ or - 0.4) and 3.2 (+ or - 0.3) km/s. A ratio for the dispersion of ellipsoid semi-axes is obtained and it is found to be in agreement with previous results with a slight deviation distributed non-uniformly on the celestial sphere.
Figueras F.
Nunez Jorge
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