Blue horizontal branch globular clusters towards the bulge: Terzan 9, NGC 6139 and NGC 6453

Details Blue horizontal branch globular clusters towards the bulge: Terzan 9, NGC 6139 and NGC 6453 Blue horizontal branch globular clusters towards the bulge: Terzan 9, NGC 6139 and NGC 6453

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..267o&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.267-273

Astronomy and Astrophysics

Astrophysics

9

Globular Clusters: Terzan 9, Ngc 6139, Ngc 6453, Hr Diagram, Stars: Horizontal Branch

Scientific paper

We present V and I photometry of the globular clusters Terzan 9 and NGC 6453 for the first time, and also of NGC 6139. The three clusters are projected towards the bulge. The Colour-Magnitude Diagram morphologies reveal that the sample clusters have blue horizontal branches. This characterizes an important fraction of the clusters projected on the bulge, with implications on the early Galaxy history. From the colour-magnitude diagrams we derive reddenings of E(B-V) = 1.95, 0.77, 0.70 and distances dsun~ 4.9, 9.4, 8.5 kpc respectively for Terzan 9, NGC 6139 and NGC 6453. We conclude that these metal-poor clusters are within the bulge volume. Observations collected at the European Southern Observatory - ESO, Chile, proposal No. 61.E-0335.

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