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An attempt to Derive the Proper Motion for Blanco Cluster 1

Published online by Cambridge University Press:  12 April 2016

Bambang Hidayat
Affiliation:
Bosscha Observatory and Department of Astronomy, ITB Bandung, Indonesia
Paulus Wiyanto
Affiliation:
Bosscha Observatory and Department of Astronomy, ITB Bandung, Indonesia
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Extract

In order to establish the probability of physical membership of open clusters by means of astrometrical methods, two criteria are used: the position distribution of stars in the sky and their proper motions. Proper motion methods have shown validity from a practical point of view; but are difficult to apply where there is a high ratio of cluster-to-field stars, and in crowded fields of the Milky Way.

As a test we have selected the nearby (170–190 pc) Blanco Cluster 1 (1 = 16°, b = −73°) in order to avoid complications arising from crowded fields. Photometric data however, suggests that the diameter of the cluster is rather extended (~ 120 arcsec). This will require a large-field solution, rather than a small-field solution which can be obtained with greater accuracy using Schmidt astrometry (Fresneau 1978; Nakamura & Sekiguchi 1993).

Type
VIII. Schmidt Astrometry
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

Epstein, L., 1968, AJ, 73, 556 CrossRefGoogle Scholar
Fresnau, A., 1978, AJ, 83, 406 CrossRefGoogle Scholar
Nakamura, T. & Sekiguchi, M., 1993, PASJ, 45, 119 Google Scholar
Röser, S., 1994, private communicationGoogle Scholar

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