Tight LMC massive star clusters R 127 and R 128

Details Tight LMC massive star clusters R 127 and R 128 Tight LMC massive star clusters R 127 and R 128

2003-01-15

arxiv.org/abs/astro-ph/0301298v1

Astron.Astrophys. 400 (2003) 923-938

Astronomy and Astrophysics

Astrophysics

16 pages, 9 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20030066

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".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".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 solar mass star, has turned into an LBV, the ``R 127'' star.

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