Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apl....17..187f&link_type=abstract
Astrophysical Letters, vol. 17, no. 4, 1976, p. 187-189.
Astronomy and Astrophysics
Astrophysics
5
Density Wave Model, Milky Way Galaxy, Open Clusters, Stellar Evolution, Astronomical Models, Cosmology, Gravitational Fields, Spiral Galaxies
Scientific paper
Birthplace locations of 10 open clusters whose ages are not greater than 250 million years on Lindoff's (1968) age scale are derived relative to the galactic spiral wave using the density-wave model of spiral structure. These clusters have known photometric distances, ages, proper motions, and radial velocities whose mean error in any velocity component is smaller than 5 km/s. The orbit followed by a cluster in the past is obtained from the cluster's present location in the Galaxy, its present velocity in space, and the gravitational field of the Galaxy; the position of the cluster on that orbit at a time in the past equal to its age yields its birthplace. The birthplaces are plotted for two different sets of ages in a coordinate system which rotates with the spiral wave. The results show that most of the birthplaces fall within or very near the Sagittarius spiral arm, irrespective of which ages are chosen. Good agreement with the spiral model employed is indicated by the fact that, with respect to a circular orbit through the sun, nearly all the clusters have birthplaces on the side where the spiral arm lies.
Forte Juan C.
Muzzio Juan C.
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