Absolute proper motions and colour-magnitude diagrams of the globular cluster NGC 4147.

Details Absolute proper motions and colour-magnitude diagrams of the globular cluster NGC 4147. Absolute proper motions and colour-magnitude diagrams of the globular cluster NGC 4147.

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998acasn..39...67w&link_type=abstract

Acta Astron. Sin., Vol. 39, No. 1, p. 67 - 75

Astronomy and Astrophysics

Astronomy

1

Globular Clusters: Proper Motions, Globular Clusters: Astrometry, Globular Clusters: Photometry, Globular Clusters: C-M Diagrams

Scientific paper

Astrometry and photometry of 115 stars down to B = 17.6 in the region of about 11'×11' around the cluster NGC 4147 were made. In the astrometric reduction, three earlier epoch plates and four recent B-passband CCD frames were used. The reduction was done by the central overlapping principle. With the new proper motion data, the membership probabilities of stars were determined. Furthermore, three colour-magnitude diagrams (CMDs) of V versus B-V, V-R and V-I, respectively, for stars of HB and GBs were constructed with CCD photometry. Some discussions about these CMDs and the cluster proper motion are made and an absolute proper motion of -2.82±0.49 mas/yr in R.A. and 2.37±0.43 mas/yr in Decl. for the cluster has been obtained.

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