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The main sequence of three red supergiant clusters

Froebrich, Dirk, Scholz, Alexander (2013) The main sequence of three red supergiant clusters. Monthly Notices of the Royal Astronomical Society, 436 (2). pp. 1116-1122. ISSN 0035-8711. (doi:10.1093/mnras/stt1633) (KAR id:49552)


Massive clusters in our Galaxy are an ideal testbed to investigate the properties and evolution of high-mass stars. They provide statistically significant samples of massive stars of uniform ages. To accurately determine the intrinsic physical properties of these stars, we need to establish the distances, ages and reddening of the clusters. One avenue to achieve this is the identification and characterization of the main-sequence (MS) members of red supergiant (RSG) rich clusters. Here, we utilize publicly available data from the UKIDSS Galactic Plane Survey. We show that point spread function photometry in conjunction with standard photometric decontamination techniques allows us to identify the most likely MSmembers in the 10-20 Myr old clusters RSGC 1-3. We confirm the previous detection of the MS in RSGC 2 and provide the first MS detection in RSGC 1 and RSGC 3. There are in excess of 100 stars with more than 8Mâ?? identified in each cluster. These MS members are concentrated towards the spectroscopically confirmed RSG stars. We utilize the J-K colours of the bright MS stars to determine the K-band extinction towards the clusters. The differential reddening is three times as large in the youngest cluster RSGC 1 as compared to the two older clusters RSGC 2 and RSGC 3. Spectroscopic follow-up of the cluster MS stars should lead to more precise distance and age estimates for these clusters as well as the determination of the stellar mass function in these high-mass environments. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Item Type: Article
DOI/Identification number: 10.1093/mnras/stt1633
Additional information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record "The main sequence of three red supergiant clusters", Dirk Froebrich and Alexander Scholz, is available online at:
Uncontrolled keywords: open clusters, associations, galaxies, star clusters
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Giles Tarver
Date Deposited: 20 Jul 2015 12:54 UTC
Last Modified: 16 Nov 2021 10:20 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Froebrich, Dirk.

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