A deep look into the core of young clusters* II. λ-Orionis

  title={A deep look into the core of young clusters* II. $\lambda$-Orionis},
  author={Herv'e Bouy and Nuria Hu{\'e}lamo and David Barrado y Navascu{\'e}s and E. L. Mart{\'i}n and Monika G. Petr-Gotzens and Johann Kolb and Enrico Marchetti and M. Morales-Calder{\'o}n and Amelia Bayo and {\'E}tienne Artigau and Markus Hartung and Franck Marchis and Motohide Tamura and Michael Sterzik and Rainer Koehler and Valentin D. Ivanov and Dieter E. A. Nuernberger},
  journal={Astronomy and Astrophysics},
Context. Over the past years, theλ−Orionis cluster has been a prime location for the study of young very low mass stars, substellar and isolated planetary mass objects and the determination of the initial mass function and other properties of low mass cluster members. Aims. In the continuity of our previous studies of young associati ons cores, we search for ultracool members and new multiple systems within the central 5. ′ 3 (≈0.6 pc) of the cluster. Methods. We obtained deep seeing limited J… 
The low-mass population of the ρ Ophiuchi molecular cloud ,
Context. Star formation theories are currently divergent regarding the fundamental physical processes that dominate the substellar regime. Observations of nearby young open clusters allow the brown
XMM-Newton observations of the young open cluster around λ Orionis ,
Aims. We studied the X-ray properties of the young (∼1−8 Myr) open cluster around the hot (O8 III) star λ Ori and compared them with those of the similarly-aged σ Ori cluster to investigate possible
XMM-Newton investigations of the Lambda Orionis star-forming region (XILO) - I. The young cluster Collinder 69
Context. This is the first paper of a series devoted to the Lambda Orionis star-forming region, Orion’s Head, from the X-ray perspective. Our final aim is to provide a comprehensive view of this
We present IRAC/MIPS Spitzer Space Telescope observations of the solar-type and the low-mass stellar population of the young (~5Myr) λ Orionis cluster. Combining optical and Two Micron All Sky
Early phases in the stellar and substellar formation and evolution. Infrared and submillimeter data in the Barnard 30 dark cloud
Aims. The early evolutionary stage of brown dwarfs (BDs) is not very well characterized, especially during the embedded phase. Our goal is to gain insight into the dominant formation mechanism of
Searching for planetary-mass T-dwarfs in the core of Serpens
We searched for isolated planetary-mass T-dwarfs in the 3Myr old Serpens Core cluster. We performed a deep imaging survey of the central part of this cluster using the WIRCam camera at the CFHT.
A search for pre-substellar cores and proto-brown dwarf candidates in Taurus: multiwavelength analysis in the B213-L1495 clouds
In an attempt to study whether the formation of brown dwarfs (BDs) takes place as a scaled-down version of low-mass stars, we conducted Institut de Radioastronomie Millimetrique (IRAM) 30 m/MAMBO-II
HH 175: a giant Herbig–Haro flow emanating from a multiple protostar
HH 175 is an isolated Herbig–Haro object seen towards the B35 cloud in the λ Ori region. We use deep Subaru 8 m interference filter images and Spitzer images to show that HH 175 is a terminal shock
A proto brown dwarf candidate in Taurus
Aims. We search for brown dwarfs at the Class 0/I evolutionary stage, or proto brown dwarfs. Methods. We present a multi wavelength study, ranging from optical at 0.8 μm to radio wavelengths at 6
Planck Cold Clumps in the λ Orionis Complex. I : Discovery of an Extremely Young Class 0 Protostellar Object and a Proto-brown Dwarf Candidate in the Bright-rimmed Clump PGCC G192.32-11.88
We are performing a series of observations with ground-based telescopes toward Planck Galactic cold clumps (PGCCs) in the lambda Orionis complex in order to systematically investigate the effects of


A deep look into the cores of young clusters. I. σ-Orionis
Context. Nearby young clusters are privileged places to study the star formation history. Over the last decade, the σ-Orionis cluster has been a prime location for the study of young very low mass
The Substellar Population of the Young Cluster λ Orionis
By collecting optical and infrared photometry and low-resolution spectroscopy, we have identified a large number of low-mass stars and brown dwarf candidates belonging to the young cluster (~5 Myr)
Spitzer: Accretion in Low-Mass Stars and Brown Dwarfs in the λ Orionis Cluster*
We present multiwavelength optical and IR photometry of 170 previously known low-mass stars and brown dwarfs of the 5 Myr Collinder 69 cluster (λ Orionis). The new photometry supports cluster
A Spitzer Space Telescope Study of Disks in the Young σ Orionis Cluster
We report new Spitzer Space Telescope observations, using the IRAC and MIPS instruments, of the young (~3 Myr) σ Orionis cluster. We identify 336 stars as members of the cluster, using optical and
The Spatial Distribution of the λ Orionis Pre-Main-Sequence Population
The λ Ori star-forming region presents a snapshot of a moderate-mass giant molecular cloud 1–2 Myr after cloud disruption by OB stars, with the OB stars, the low-mass stellar population, remnant
A Photometric Study of the Young Stellar Population throughout the λ Orionis Star-forming Region
We present VRI photometry of 320,917 stars with 11 R 18 throughout the λ Ori star-forming region. Using the more spatially limited spectroscopic surveys of Dolan & Mathieu to define the
A WIYN Lithium Survey for Young Stars in the λ Orionis Star-forming Region
We have found 72 premain-sequence (PMS) stars near the center of the j Orionis star-forming region by spectroscopically testing a magnitude-limited sample for the presence of lithium j6708
The young, wide and very low mass visual binary Lambda Orionis 167
Aims. We look for wide, faint companions around members of the 5 Myr Lambda Orionis open cluster. Methods. We used optical, near-infrared, and Spitzer/IRAC photometry. Results. We report the
FLAMES spectroscopy of low-mass stars in the young clusters σ Ori and λ Ori ,
Aims. We performed a detailed membership selection and studied the accretion properties of low-mass stars in the two apparently very similar young (1–10 Myr) clusters σ Ori and λ Ori. Methods. We
The primordial binary population. I. A near-infrared adaptive optics search for close visual companions to A star members of Scorpius OB2
We present the results of a near-infrared adaptive optics survey with the aim to detect close companions to Hipparcos members in the three subgroups of the nearby OB association Sco OB2: Upper