EDP Sciences
Free access
Issue A&A
Volume 477, Number 2, January II 2008
Page(s) 681 - 690
Section Astronomical instrumentation
DOI http://dx.doi.org/10.1051/0004-6361:20078599

A&A 477, 681-690 (2008)
DOI: 10.1051/0004-6361:20078599

Multi-conjugate adaptive optics images of the Trapezium cluster

H. Bouy1, 2, J. Kolb3, E. Marchetti3, E. L. Martín2, 4, N. Huélamo5, and D. Barrado y Navascués5

1  Astronomy Department, University of California, Berkeley, CA 94720, USA
    e-mail: hbouy@astro.berkeley.edu
2  Instituto de Astrofísica de Canarias, C/ vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
    e-mail: ege@iac.es
3  European Southern Observatory, Karl Schwartzschild Str. 2, 85748 Garching bei München, Germany
    e-mail: [jkolb;emarchet]@eso.org
4  University of Central Florida, Department of Physics, PO Box 162385, Orlando, FL 32816-2385, USA
5  Laboratorio de Astrofísca Espacial y Física Fundamental (LAEFF-INTA), Apdo 50727, 28080 Madrid, Spain
    e-mail: [nhuelamo;barrado]@laeff.inta.es

(Received 2 September 2007 / Accepted 25 September 2007)

Context.Multi-conjugate adaptive optics (MCAO) combine the advantages of both standard adaptive optics, which provide high contrast and high spatial resolution, and of wide field imaging ($\approx$1'). Up to recently, MCAO for astronomy was limited to laboratory experiments. In this paper, we present the first scientific results obtained with the first MCAO instrument.
Aims.We present a new study of the Trapezium cluster using deep MCAO images with a field of view of 1'$\times$1' obtained at the VLT.
Methods.We used deep J, H, and Ks images recently obtained with the prototype MCAO facility MAD at the VLT to search for new members and new multiple systems in the Trapezium cluster. On bright targets ($K{\rm s}$$\approx$9 mag), these images allow us to reach ${\rm\Delta}$$K{\rm s}$$\approx$6 mag as close as 0$\farcs$4.
Results.We report detection of 128 sources, including 10 new faint objects in the magnitude range between 16.1 < $K{\rm s}$ < 17.9 mag. In addition to all previously known multiple systems with separations greater than 0$\farcs$1, we confirm the multiplicity of TCC-055. We also report the detection in J, H, and $K{\rm s}$ of a very red extended embedded protostellar object, HC 419, previously detected only in the thermal infrared.
Conclusions.Analysis of the first MCAO images obtained on the sky demonstrates not only the technical feasibility of MCAO, but also its great potential and versatility in terms of scientific output.

Key words: instrumentation: adaptive optics -- techniques: high angular resolution -- stars: binaries visual -- stars: evolution -- stars: formation -- stars: general

© ESO 2007

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Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: N. Aghanim

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

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