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A Survey of M31 Globular Clusters Using WFPC2 on board HST

Published online by Cambridge University Press:  03 August 2017

R.M. Rich ,
C.E. Corsi ,
M. Bellazzini ,
L. Federici ,
C. Cacciari  and
F. Fusi Pecci
R.M. Rich
Affiliation:
Dept. of Phys. & Astron., UCLA, Los Angeles, CA 90095-1562, USA
C.E. Corsi
Affiliation:
Osservatorio Astronomico, V.le Parco Mellini 84, 00136 Roma, Italy
M. Bellazzini
Affiliation:
Osservatorio Astronomico, Via Ranzani 1, 40127 Bologna, Italy
L. Federici
Affiliation:
Osservatorio Astronomico, Via Ranzani 1, 40127 Bologna, Italy
C. Cacciari
Affiliation:
Osservatorio Astronomico, Via Ranzani 1, 40127 Bologna, Italy
F. Fusi Pecci
Affiliation:
Osservatorio Astronomico, Poggio dei Pini, 09012 Capoterra, Italy

Abstract

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We report new, as yet unpublished HST/WFPC2 V, I photometry of 9 globular clusters in M31. These are part of a total sample of 19 clusters on M31 with well observed CMDs from HST. The clusters have the full range of horizontal branch morphologies from blue HB to red clump, but none are found with an extreme (blue only) horizontal branch. Plots of HB type vs [Fe/H] are similar to those of Galactic clusters, including a hint of second parameter clusters. Sixteen halo fields adjacent to the observed clusters included in our images have been analysed. The M31 halo metallicity distribution peaks at [Fe/H]=-0.7 dex with a tail toward low metallicity, resembling the halo of NGC 5128; metal-rich giants appear to be centrally concentrated.

Type
Part 1. The Star Clusters of Local Group Galaxies
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 140 - 142
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

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