Journal Article

A benchmark for multiconjugated adaptive optics: VLT–MAD observations of the young massive cluster Trumpler 14*

B. Rochau, W. Brandner, A. Stolte, T. Henning, N. Da Rio, M. Gennaro, F. Hormuth, E. Marchetti and P. Amico

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 2, pages 949-959
Published in print December 2011 | ISSN: 0035-8711
Published online November 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19561.x
A benchmark for multiconjugated adaptive optics: VLT–MAD observations of the young massive cluster Trumpler 14*

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The Multi-conjugate Adaptive optics Demonstrator (MAD) is the first multiconjugated adaptive optics system at the Very Large Telescope (VLT). We present H and KS observations of the young massive cluster Trumpler 14 revealing the power of MCAO systems by providing a homogeneous Strehl ratio over a large field of view. Mean Strehl ratios of 6.0 and 5.9 per cent with maximum Strehl ratios of 9.8 and 12.6 per cent in H and KS, respectively, show significant improvement of the spatial point spread function (PSF) stability compared to single-conjugated adaptive optics systems. Photometry of our observations cover a dynamic range of ∼10 mag including 2–3 times greater number of sources than comparable seeing-limited observations. The colour–magnitude diagram reveals that the massive cluster originated in a recent starburst-like event 1 ± 0.5 Myr ago. We tentatively detect hints for an older population of 3 Myr suggesting that low intensity star formation might have been going on in the Hii region for a few Myr. We derive the luminosity function and mass function between 0.1 and 3.2 M and identify a change in the power-law slope of the mass function at mc∼ 0.53+0.12− 0.10 M. The MF appears shallow with power-law slopes of Γ1=−0.50 ± 0.11 above mc and Γ2= 0.63 ± 0.32 below mc.

Keywords: instrumentation: adaptive optics; stars: pre-main-sequence; open clusters and associations: individual: Trumpler 14

Journal Article.  7845 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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