Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1524r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1524-1532, 1713.
Astronomy and Astrophysics
Astronomy
20
Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Stellar Motions, Astronomical Catalogs, Astronomical Coordinates, Photographic Plates
Scientific paper
New proper motions have been derived from reductions of PDS microdensitometer scans of 17 Yerkes refractor plates spanning an epoch range of 88 years for 515 stars down to V of about 15.6 in the region of the globular cluster M5. Photographic photometry in B and V has been obtained for these stars from these scans and scans of six Yerkes reflector plates. The present proper motions have significantly improved precision compared to Cudworth (1979). A color-magnitude diagram of probable members is presented and discussed, as well as comparisons to previous photometry. All but two of the previously known or suspected variables are found to be highly probable members. These proper motions have been used by Cudworth and Hanson (1993) to derive a large space velocity for M5, implying that it is a rich outer halo cluster on an eccentric orbit near perigalacticon. These motions will be used in a forthcoming paper to explore the internal dynamics of M5, including a derivation of the cluster distance by comparison of the proper motion and radial velocity dispersions.
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