HP 1: a blue horizontal branch globular cluster in the bulge

Details HP 1: a blue horizontal branch globular cluster in the bulge HP 1: a blue horizontal branch globular cluster in the bulge

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.284..692o&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 284, Issue 3, pp. 692-698.

Astronomy and Astrophysics

Astronomy

29

Globular Clusters: Individual: Hp1, Galaxy: Halo, Galaxy: Structure.

Scientific paper

We present V, I colour-magnitude diagrams of the globular cluster HP1 obtained at the European Southern Observatory New Technology Telescope under exceptional seeing conditions. The cluster shows blue horizontal branch (HB) and red giant branch morphologies very similar to clusters of intermediate metallicity such as NGC6752 we therefore estimate [Fe/H]ap-1.5 for HP1. The blue HB morphology is extended, which is not unusual for a post-core-collapse cluster. We derive a reddening of E(B-V)=1.19 and a distance dsolar=6.85kpc. HP1 might be a halo cluster crossing the bulge or belong to the low-metallicity tail of the bulge.

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