The metal-rich bulge globular cluster NGC 6401

Details The metal-rich bulge globular cluster NGC 6401 The metal-rich bulge globular cluster NGC 6401

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...348..783b&link_type=abstract

Astronomy and Astrophysics, v.348, p.783-788 (1999)

Astronomy and Astrophysics

Astrophysics

19

Stars: Hertzsprung-Russel (Hr) And C-M Diagrams, Galaxy: Globular Clusters: Individual: Ngc 6401

Scientific paper

We present V and I photometry for the bulge globular cluster NGC 6401 for the first time. The Colour-Magnitude Diagram reveals a red horizontal branch, and the cluster is metal-rich ([Fe/H] ~ -0.7). NGC 6401 is located at 5.3(deg) from the Galactic center, turning out to be an interesting target to trace the extent of the bulge. A reddening E(B-V) = 0.53+/-0.15 and a distance from the Sun dsun ~ 12.0+/-1.0 kpc are derived. The cluster is slightly behind the bulk of the bulge population in that direction, but still within the bulge volume. Since the number of clusters with Horizontal Branch information has increased enormously in the later years for the central 20(deg) x20(deg), we present a discussion on the distribution of red and blue horizontal branch clusters and their possible relation to bulge and/or halo. Observations collected at the European Southern Observatory -- ESO, Chile, proposal no. 61.E-0335

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