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Another cluster of red supergiants close to RSGC1

Negueruela, I.; González-Fernández, C.; Marco, A.; Clark, J. S. and Martínez-Núñez, S. (2010). Another cluster of red supergiants close to RSGC1. Astronomy & Astrophysics, 513, article no. A74.

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Context. Recent studies have revealed massive star clusters in a region of the Milky Way close to the tip of the Long Bar. These clusters are heavily obscured and are characterised by a population of red supergiants.

Aims. We analyse a previously unreported concentration of bright red stars ~16' away from the cluster RSGC1

Methods. We utilised near IR photometry to identify candidate red supergiants and then K-band spectroscopy of a sample to characterise their properties.

Results. We find a compact clump of eight red supergiants and five other candidates at some distance, one of which is spectroscopically confirmed as a red supergiant. These objects must form an open cluster, which we name Alicante 8. Because of the high reddening and strong field contamination, the cluster sequence is not clearly seen in 2MASS or UKIDSS near-IR photometry. From the analysis of the red supergiants, we infer an extinction AKs = 1.9 and an age close to 20 Myr.

Conclusions. Though this cluster is smaller than the three known previously, its properties still suggest a mass in excess of 10 000 M. Its discovery corroborates the hypothesis that star formation in this region has happened on a wide scale between ~10 and ~20 Myr ago.

Item Type: Journal Item
Copyright Holders: 2010 ESO
ISSN: 1432-0746
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetRCUK (Research Councils UK)
Extra Information: 9 pp.
Keywords: stellar evolution; supergiants; galactic structure; open clusters and associations
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 19912
Depositing User: J. Simon Clark
Date Deposited: 11 Feb 2010 16:13
Last Modified: 07 Dec 2018 12:04
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