SCYON Abstract

Received on August 12 2011

About the nature of Mercer14

AuthorsD. Froebrich and G. Ioannidis
AffiliationUniversity of Kent
Accepted byMonthly Notices of the Royal Astronomical Society
Contactdf@star.kent.ac.uk
URLhttp://astro.kent.ac.uk/~df/
Links

Abstract

We used UKIRT near infrared (NIR) broad band JHK photometry, narrow band imaging of the 1-0S(1) molecular hydrogen emission line and mid infrared Spitzer IRAC data to investigate the nature of the young cluster Mercer14. Foreground star counts in decontaminated NIR photometry and a comparison with the Besancon Galaxy Model are performed to estimate the cluster distance. This method yields a distance of 2.5kpc with an uncertainty of about 10% and can be applied to other young and embedded clusters. Mercer14 shows clear signs of ongoing star formation with several detected molecular hydrogen outflows, a high fraction of infrared excess sources and an association to a small gas and dust cloud. Hence, the cluster is less than 4Myrs old and has a line of sight extinction of AK=0.8mag. Based on the most massive cluster members we find that Mercer14 is an intermediate mass cluster with about 500M(sun).