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ISOCAM observations of the L1551 star formation region

Gålfalk, M. and Olofsson, G. and Kaas, A. A. and Olofsson, S. and Bontemps, S. and Nordh, L. and Abergel, A. and André, P. and Boulanger, F. and Burgdorf, M. and Casali, M. M. and Cesarsky, C. J. and Davies, J. and Falgarone, E. and Montmerle, T. and Perault, M. and Persi, P. and Prusti, T. and Puget, J. L. and Sibille, F. (2004) ISOCAM observations of the L1551 star formation region. Astronomy & Astrophysics, 420 (3). pp. 945-955. ISSN 0004-6361. doi:10.1051/0004-6361:20035758.

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The results of a deep mid-IR ISOCAM survey of the L1551 dark molecular cloud are presented. The aim of this survey is a search for new YSO (Young Stellar Object) candidates, using two broad-band filters centred at 6.7 and 14.3 μm. Although two regions close to the centre of L1551 had to be avoided due to saturation problems, 96 sources were detected in total (76 sources at 6.7 μm and 44 sources at 14.3 μm). Using the 24 sources detected in both filters, 14 were found to have intrinsic mid-IR excess at 14.3 μm and were therefore classified as YSO candidates. Using additional observations in B, V, I, J, H and K obtained from the ground, most candidates detected at these wavelengths were confirmed to have mid-IR excess at 6.7 μm as well, and three additional YSO candidates were found. Prior to this survey only three YSOs were known in the observed region (avoiding L1551 IRS 5/NE and HL/XZ Tau). This survey reveals 15 new YSO candidates, although several of these are uncertain due to their extended nature either in the mid-IR or in the optical/near-IR observations. Two of the sources with mid-IR excess are previously known YSOs, one is a brown dwarf (MHO 5) and the other is the well known T Tauri star HH 30, consisting of an outflow and an optically thick disk seen edge on.

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URLURL TypeDescription Paper
Davies, J.0000-0002-4108-4357
Additional Information:© 2004 ESO. Received: 28 November 2003. Accepted: 15 March 2004. The Swedish participation in this research is funded by the Swedish National Space Board. This publication made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. A.A.K. thanks Carlos Baffa, Mauro Sozzi, Ruggero Stanga, and Lenoardo Testi from the Arnica team for the instrument support at the NOT in 1996.
Funding AgencyGrant Number
Swedish National Space Board (SNSB)UNSPECIFIED
Subject Keywords:stars: formation – stars: low-mass, brown dwarfs – stars: pre-main sequence – stars: late-type – infrared: stars
Issue or Number:3
Record Number:CaltechAUTHORS:20180223-115734032
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Official Citation:ISOCAM observations of the L1551 star formation region M. Gålfalk, G. Olofsson, A. A. Kaas, S. Olofsson, S. Bontemps, L. Nordh, A. Abergel, P. André, F. Boulanger, M. Burgdorf, M. M. Casali, C. J. Cesarsky, J. Davies, E. Falgarone, T. Montmerle, M. Perault, P. Persi, T. Prusti, J. L. Puget and F. Sibille A&A, 420 3 (2004) 945-955 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84943
Deposited By: Ruth Sustaita
Deposited On:24 Feb 2018 00:20
Last Modified:15 Nov 2021 20:24

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