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Proper motion study of the globular cluster M 3
We present proper motions for stars in the field of the galacticglobular cluster NGC 5272 (M 3). This study forms part of the Bonnprogramme of globular cluster proper motions. 14 plates were taken withthe Bonn double refractor, spanning epoch differences of up to 85 years.Relative proper motions for all well-measurable stars in the 1.5deg x1.5deg field covered by the plates were derived. Typical proper motionerrors are 0.5-1.2 milliarcsec/year. The cluster membership of UV-brightand variable stars is discussed. The proper motions are compared withthe accurate relative proper motions of Cudworth (1979) and with theabsolute proper motions from Schmidt plates referred to galaxies ofScholz et al. (1993). The latter comparison enables us to tie the propermotions of the stars and the mean proper motion of M 3 to an inertialsystem. The absolute proper motions of Hipparcos stars in the field willbe useful for an extragalactic calibration of the Hipparcos propermotion system. The data for the 791 stars is available via the CDS(Centre des Donnees Astronomiques Strasbourg) Data Centre.
| Catalogue de 1571 etoiles contenues dan l'amas globulaire Messier 3 (N. G.C. 5272)
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Observation and Astrometry data
| Constellation: | Canes Venatici |
| Right ascension: | 13h42m28.69s |
| Declination: | +28°31'59.0" |
| Apparent magnitude: | 10.635 |
| Proper motion RA: | -48 |
| Proper motion Dec: | -3.5 |
| B-T magnitude: | 11.209 |
| V-T magnitude: | 10.683 |
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