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Proper Motions Referred to Faint Galaxies

Published online by Cambridge University Press:  30 March 2016

W. F. van Altena
Affiliation:
Yale University Observatory, New Haven, CT 06511
T. Girard
Affiliation:
Yale University Observatory, New Haven, CT 06511
C. E. López
Affiliation:
Yale University Observatory, New Haven, CT 06511
A. R. Klemola
Affiliation:
Lick Observatory, UCSC, Santa Cruz, CA 95064
B. F. Jones
Affiliation:
Lick Observatory, UCSC, Santa Cruz, CA 95064
R. B. Hanson
Affiliation:
Lick Observatory, UCSC, Santa Cruz, CA 95064

Extract

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The Lick Northern Proper Motion (NPM) and the Yale-San Juan Southern Proper Motion (SPM) programs have been described on several occasions (Wright 1950; Deutsch and Klemola 1974; Vasilevskis 1973; and Wesselink 1974). The two programs represent an attempt to measure the coordinates and proper motions, with respect to the extragalactic reference frames, for large numbers of stars representing most of the astrophysically-recognized classes. The photographic plate material forming the basis of the NPM program derives from the first (1947-1954) and second (1970-present) epoch phases for 1246 fields with the Lick 51 cm Carnegie double-astrograph for centers at -20° and northward (Shane and Wirtanen 1967). A southern supplement of 144 additional fields takes the program to -30°. The SPM consists of 632 fields with centers at -20° and southward. The first epoch plates were taken between 1965 and 1974 and a partial extension of 72 fields to more northerly declinations is essentially complete. One short and one long exposure permit the measurement of positions and approximate photometry for selected stars and reference galaxies over the blue magnitude range from about 8 to 17-18.

Type
Joint Discussions
Copyright
Copyright © Reidel 1986

References

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