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Title:
First results of a photometric and astrometric study of the globular cluster M 71 (NGC 6838)
Authors:
Geffert, M.; Maintz, G.
Affiliation:
AA(Sternwarte der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany; Observatoire de Bordeaux, URA 352 CNRS/INSU, BP. 89, F-33270 Floirac, France), AB(Sternwarte der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany)
Publication:
Astronomy and Astrophysics Supplement, v.144, p.227-233 (A&AS Homepage)
Publication Date:
06/2000
Origin:
A&AS
A&A Keywords:
ASTROMETRY, (STARS:) BLUE STRAGGLERS, (GALAXY:) GLOBULAR CLUSTERS: INDIVIDUAL: M 71
DOI:
10.1051/aas:2000209
Bibliographic Code:
2000A&AS..144..227G

Abstract

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.

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