UKIRT follow-up observations of the old open cluster FSR0358 (Kirkpatrick1)

Details UKIRT follow-up observations of the old open cluster FSR0358 (Kirkpatrick1) UKIRT follow-up observations of the old open cluster FSR0358 (Kirkpatrick1)

2009-02-24

arxiv.org/abs/0902.4023v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

8 pages, 1 table, 5 figures, accepted for publication by MNRAS, a version with higher resolution figures can be found at htt

Scientific paper

10.1111/j.1365-2966.2009.14680.x

We aim to characterise the properties of the stellar clusters in the Milky Way. Utilising an expectation-maximisation method we determined that the cluster FSR0358, originally discovered by J.D.Kirkpatrick, is the most likely real cluster amongst the cluster candidates from Froebrich et al.. Here we present new deep high resolution near infrared imaging of this object obtained with UKIRT. The analysis of the data reveals that FSR0358 (Kirkpatrick1) is a 5+-2Gyr old open cluster in the outer Milky Way. Its age, metallicity of Z=0.008 and distance from the Galactic Centre of 11.2kpc are typical for the known old open galactic clusters. So far six of the FSR cluster candidates have been identified as having an age above 5Gyr. This shows the significance of this catalogue in enhancing our knowledge of the oldest open clusters in the Galaxy.

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