Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..105c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 96, July 1988, p. 105-115. NSF-supported research.
Astronomy and Astrophysics
Astronomy
72
Astrometry, Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Variable Stars, X Ray Sources, Error Analysis, Galactic Clusters, Lyra Constellation, Stellar Motions
Scientific paper
Proper motions and BV magnitudes are determined for 600 stars in the vicinity of the X-ray globular cluster NGC 6712 using plates obtained with the 5-m telescope at Palomar Observatory in 1955, with the 36-inch telescope at Lick Observatory during 1964-1979, with the 40-inch telescope at Yerkes Observatory in 1979, and with the 2.5-m telescope at Las Campanas in 1985. The data are compiled in extensive tables and graphs and characterized in detail. NGC 6712 cluster parameters calculated include E(B-V) = 0.42 + or - 0.03, distance = 6.5 + or - 0.6 kpc (if the horizontal branch V magnitude is 0.85 mag), and space velocity inconsistent with membership in the local disk subpopulation of globulars. A blue star of V magnitude about 20 mag is discussed as a candidate optical counterpart of the NGC 6712 X-ray source.
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