EDP Sciences
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Volume 400, Number 3, March IV 2003
Page(s) 923 - 937
Section Stellar clusters and associations
DOI http://dx.doi.org/10.1051/0004-6361:20030066

A&A 400, 923-937 (2003)
DOI: 10.1051/0004-6361:20030066

Tight LMC massive star clusters R 127 and R 128

M. Heydari-Malayeri1, F. Meynadier1 and N. R. Walborn2

1  LERMA, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
2  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA

(Received 12 November 2002 / Accepted 7 January 2003 )

We study the Large Magellanic Cloud (LMC) star clusters R 127 and R 128 using imaging and spectroscopy obtained at the ESO NTT telescope. An advanced image restoration technique allows us to resolve these two clusters into at least 14 and 33 stars respectively and obtain their photometry. In particular, we show that the core of R 127 is composed of at least four stars and identify the Luminous Blue Variable (LBV) component. The closest neighbor of the LBV (star #8) is 1 $\farcs$5 away. Moreover, from medium dispersion spectroscopy we determine the spectral types for 19 stars in and near both clusters, and in particular present the first spatially resolved observation of the second brightest component of the R 127 cluster (star #3) situated 3 $\farcs$3 from the LBV. By comparing with evolutionary models we also look into the stellar ages. The oldest stars of the cluster are ~6-8 Myr old, whereas the most massive star of the region (#7), formed ~3 Myr ago as an 80 $M_{\odot}$ star, has turned into an LBV, the "R 127" star.

Key words: stars: early-type -- ISM: individual objects: R 127, R 128 -- galaxies: Magellanic Clouds

Offprint request: F. Meynadier, Frederic.Meynadier@obspm.fr

SIMBAD Objects

© ESO 2003