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A third red supergiant rich cluster in the Scutum-Crux arm

Clark, J.S., Negueruela, I., Davies, B., Larionov, V.M., Ritchie, B.W., Figer, D.F., Messineo, M., Crowther, P.A. and Arkharov, A.A. (2009) A third red supergiant rich cluster in the Scutum-Crux arm. Astronomy and Astrophysics, 498 (1). pp. 109-114. ISSN 0004-6361

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Aims. We aim to characterise the properties of a third massive, red supergiant dominated galactic cluster.

Methods. To accomplish this we utilised a combination of near/mid-IR photometry and spectroscopy to identify and classify the properties of cluster members, and statistical arguments to determine the mass of the cluster.

Results. We found a total of 16 strong candidates for cluster membership, for which formal classification of a subset yields spectral types from K3-M4 Ia and luminosities between log(L/L-circle dot) similar to 4.5-4.8 for an adopted distance of 6 +/- 1 kpc. For an age in the range of 16-20 Myr, the implied mass is 2-4 x 10(4) M-circle dot, making it one of the most massive young clusters in the Galaxy. This discovery supports the hypothesis that a significant burst of star formation occurred at the base of Scutum-Crux arm between 10-20 Myr ago, yielding a stellar complex comprising at least similar to 10(5) M-circle dot of stars (noting that since the cluster identification criteria rely on the presence of RSGs, we suspect that the true stellar yield will be significantly higher). We highlight the apparent absence of X-ray binaries within the star formation complex and finally, given the physical association of at least two pulsars with this region, discuss the implications of this finding for stellar evolution and the production and properties of neutron stars.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 EDP Sciences. Reproduced in accordance with the publisher's self-archiving policy.
Keywords: stars: supergiants; Galaxy: open clusters and associations: individual: ScutumCrux arm; stars: late-type
Institution: The University of Sheffield, The University of Leeds
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
Depositing User: Miss Anthea Tucker
Date Deposited: 27 May 2009 16:55
Last Modified: 06 Jul 2014 03:54
Published Version: http://dx.doi.org/10.1051/0004-6361/200911945
Status: Published
Publisher: EDP Sciences
Refereed: Yes
Identification Number: 10.1051/0004-6361/200911945
URI: http://eprints.whiterose.ac.uk/id/eprint/8608

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