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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606383.0, MPI für Astronomie / Publikationen_mpia
VLT-MAD observations of Trumpler 14
Authors:Rochau, B.; Brandner, W.; Stolte, A.; Henning, T.; da Rio, N.; Gennaro, M.; Hormuth, F.; Marchetti, E.; Amico, P.
Date of Publication (YYYY-MM-DD):2011-01
Title of Proceedings:Stellar Clusters & Associations: A RIA Workshop on Gaia
Start Page:239
End Page:243
Name of Conference/Meeting:Stellar Clusters & Associations: A RIA Workshop on Gaia
Audience:Not Specified
Abstract / Description:We present H and KS observations of the young massive cluster Trumpler 14 obtained with the MCAO system VLT-MAD which provides homogeneous Strehl ratios over a large field of view. We derived maximum Strehl ratios of 9.8% and 12.6% with mean Strehl ratios of 6.0% and 5.9% with in H and K_S, respectively, revealing significant improvement of the spatial PSF stability compared to SCAO systems. We detected 2-3 times more sources than comparable seeing-limited observations, and comparison of the colour-magnitude diagram with isochrones reveals a very young cluster that originated in a starburst-like event 1 ± 0.5 Myr ago. We also tentatively detect hints for an older population of 3 Myr. The mass function between 0.25 Msun and 3.2 Msun appears as a broken power law with a change of the power law slope at m_c Ëœ 0.53+0.12-0.10 Msun. Shallow power law slopes are found to be Gamma_{PD,PMS1} = Ëœ 0.48 ± 0.11 above m_c and Gamma_{PD,PMS2} = 0.68 ± 0.30 below m_c.
Comment of the Author/Creator:Date: 2011 online, n/a 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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