Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58...65y&link_type=abstract
Astronomy and Astrophysics, vol. 58, no. 1-2, June 1977, p. 65-78. Research supported by the City University of New York.
Astronomy and Astrophysics
Astrophysics
12
Chronology, Density Wave Model, Milky Way Galaxy, Pleiades Cluster, Star Clusters, Stellar Motions, Galactic Structure, Gravitational Fields, Interstellar Gas, Star Distribution, Stellar Evolution, Trajectory Analysis
Scientific paper
The space distribution and space velocities of the Pleiades group are discussed, and the detailed migration history of 23 individual group members is traced on the basis of nonlinear calculations with the inclusion of a spiral gravitational field. The results indicate that the Pleiades group originated 150 million years ago in a narrow region of 100 by 800 sq pc in the galactic plane along the Sagittarius spiral arm. The exceptionally large size of the focusing region for the Pleiades stars is explained in terms of continuous star formation in a single cloud or several neighboring clouds over a finite period of time. The general procedure developed for age determination is applied to estimate an age of 715 million years for the Hyades group as well as for an anonymous group characterized by a tangential space-velocity component of 6 km/s.
Waxman Allen M.
Yuan Changhe
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