Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26as..144..227g&link_type=abstract
Astronomy and Astrophysics Supplement, v.144, p.227-233
Astronomy and Astrophysics
Astrophysics
12
Astrometry, (Stars:) Blue Stragglers, (Galaxy:) Globular Clusters: Individual: M 71
Scientific paper
We present the first results of a photometric and astrometric investigation of stars in the region of the globular cluster M 71 (NGC 6838). Using wide field CCD observations we determined B and V magnitudes of 4450 stars up to a limiting magnitude of V <= 18.5 mag. Relative proper motions were used to derive membership probabilities for stars with R<3arcmin around the centre of M 71. Our colour-magnitude diagram (CMD) of 320 probable cluster members reaches down to V = 18. A well defined red giant bump - for the first time seen in M 71 - could be detected in our CMD. From isochrone fitting we find M 71 metal poorer and older than previously assumed. Four faint variable stars were confirmed to be members of M 71. Moreover, we detected 13 blue stragglers among our cluster members.
Geffert Michael
Maintz Gisela
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