Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pazh....8..714y&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Dec. 1982, p. 714-716) Soviet Astronomy Letters (ISSN 0360-0327), vol. 8, Nov.-Dec.
Astronomy and Astrophysics
Astronomy
2
Astrometry, B Stars, Stellar Motions, Astronomical Coordinates, Brightness, Milky Way Galaxy, Open Clusters, Stellar Evolution, Velocity
Scientific paper
An analysis is made of the proper motions of stars belonging to 34 systems that resemble the Trapezium in Orion. The kinematics of Trapezium-type systems are found to be practically indistinguishable from the kinematics of stars of spectral types B I - B II. The internal relative velocities of trapezium members have a dispersion approximately 2.5 times smaller than the peculiar velocities of B stars generally. This is seen as suggesting that the members of an individual trapezium are indeed physically associated. The internal space velocities of trapezium members possess a dispersion of + or 5 km/s. For trapezia that are constituent parts of open clusters, this quantity appears smaller. In fact, it is to small too determine from measurements of the present accuracy for proper motions of trapezium members.
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