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13 papers · 2 filters
The IMF and Star Formation History of the Stellar Clusters in the Vela D Cloud
Fabrizio Massi, Leonardo Testi, Leonardo Vanzi
We present the results of a Near-Infrared deep photometric survey of a sample of six embedded star clusters in the Vela-D molecular cloud, all associated with luminous (~10^3 Lsun)…
Exploring the Lower Mass Function in the young open Cluster IC 4665
W. J. de Wit, J. Bouvier, F. Palla +8
We present a study of the young (30-100Myr) open cluster IC 4665 with the aim to determine the shape of the mass function well into the brown dwarf regime. We photometrically selec…
Search for massive protostar candidates in the southern hemisphere: II. Dust continuum emission
Maria T. Beltran, Jan Brand, Riccardo Cesaroni +4
In an ongoing effort to identify and study high-mass protostellar candidates we have observed in various tracers a sample of 235 sources selected from the IRAS Point Source Catalog…
Disk and wind interaction in the young stellar object MWC 297 spatially resolved with VLTI/AMBER
F. Malbet, M. Benisty, W. J. De Wit +15
The young stellar object MWC 297 has been observed with the VLT interferometer equipped with the AMBER instrument. MWC 297 has been spatially resolved in the continuum with a visib…
First results from a VLBA proper motion survey of H2O masers in low-mass YSOs: the Serpens core and RNO15-FIR
L. Moscadelli, L. Testi, R. S. Furuya +4
This article reports first results of a long-term observational program aimed to study the earliest evolution of jet/disk systems in low-mass YSOs by means of VLBI observations of…
First AMBER/VLTI observations of hot massive stars
R. G. Petrov, F. Millour, O. Chesneau +45
AMBER is the first near infrared focal instrument of the VLTI. It combines three telescopes and produces spectrally resolved interferometric measures. This paper discusses some pre…
VITRUV - Science Cases
Paulo J. V. Garcia, Jean-Phillipe Berger, Romano Corradi +11
VITRUV is a second generation spectro-imager for the PRIMA enabled Very Large Telescope Interferometer. By combining simultaneously up to 8 telescopes VITRUV makes the VLTI up to 6…
Disentangling the wind and the disk in the close surrounding of the young stellar object MWC297 with AMBER/VLTI
Fabien Malbet, M. Benisty, W. J. De Wit +13
The young stellar object MWC297 is a B1.5Ve star exhibiting strong hydrogen emission lines. This object has been observed by the AMBER/VLTI instrument in 2-telescope mode in a sub-…
A resolved outflow of matter from a Brown Dwarf
Emma T. Whelan, Thomas P. Ray, Francesca Bacciotti +3
The birth of stars involves not only accretion but also, counter-intuitively, the expulsion of matter in the form of highly supersonic outflows. Although this phenomenon has been s…
Spatially resolved PAH emission in the inner disks of Herbig Ae/Be stars
Emilie Habart, Antonella Natta, Leonardo Testi +1
We present adaptive optics high angular resolution ($\sim0.1\arcsec$) spectroscopic observations in the 3 \um region of eight well known Herbig Ae/Be stars with circumstellar disks…
The Origin of Massive O-type Field Stars. Part II: Field O stars as runaways
W. J. de Wit, L. Testi, F. Palla +1
In two papers we try to confirm that all Galactic high-mass stars are formed in a cluster environment, by excluding that O-type stars found in the Galactic field actually formed th…
A detailed study of the rotating toroids in G31.41+0.31 and G24.78+0.08
Maria T. Beltran, Riccardo Cesaroni, Roberto Neri +4
We present the results of high angular resolution millimeter observations of gas and dust toward G31.41+0.31 and G24.78+0.08, two high-mass star forming regions where four rotating…
Relative Evolutionary Time Scale of Hot Molecular Cores with Respect to Ultra Compact HII Regions
R. S. Furuya, R. Cesaroni, S. Takahashi +4
Using the Owens Valley and Nobeyama Radio Observatory interferometers, we carried out an unbiased search for hot molecular cores and ultracompact UC HII regions toward the high-mas…