Properties of Stellar Clusters around High-Mass Young Stars (2009)
Faustini, Fabiana, Molinari, Sergio, Testi, Leonardo, Brand, Jan
[Abridged] Twenty-six high-luminosity IRAS sources believed to be collection of stars in the early phases of high-mass star formation have been observed in the NIR (J, H, K) to characterize the...
Phase Referencing in Optical Interferometry (2008)
Filho, Mercedes E., Garcia, Paulo, Duvert, Gilles, Duchene, Gaspard, Thiebaut, Eric, Young, John, ...
One of the aims of next generation optical interferometric instrumentation is to be able to make use of information contained in the visibility phase to construct high dynamic range images. Radio and...
Phase Closure Image Reconstruction for Future VLTI Instrumentation (2008)
Filho, Mercedes E., Renard, Stephanie, Garcia, Paulo, Duvert, Gilles, Duchene, Gaspard, Thiebaut, Eric, ...
Classically, optical and near-infrared interferometry have relied on closure phase techniques to produce images. Such techniques allow us to achieve modest dynamic ranges. In order to test the...
The star formation in the L1615/L1616 cometary cloud (2008)
Gandolfi, Davide, Alcalá, Juan M., Leccia, Silvio, Frasca, Antonio, Spezzi, Loredana, Covino, Elvira, ...
The present work aims at performing a comprehensive census and characterisation of the pre-main sequence (PMS) population in the cometary cloud L1615/L1616, in order to assess the significance of the...
Science case for 1 mas spectro-imagining in the near-infrared (2008)
Garcia, Paulo J V, Berger, Jean-Philippe, Marconi, Alessandro, Krivov, Alexander, Chiavassa, Andrea, Aringer, Bernard, ...
Optical and Infrared Interferometry.
Phase closure image reconstruction for future VLTI instrumentation (2008)
Filho, Mercedes E, Renard, Stephanie, Garcia, Paulo, Duvert, Gilles, Duchene, Gaspard, Thiebaut, Eric, ...
Optical and Infrared Interferometry.
Phase referencing in optical interferometry (2008)
Filho, Mercedes E, Garcia, Paulo, Duvert, Gilles, Duchene, Gaspard, Thiebaut, Eric, Young, John, ...
Optical and Infrared Interferometry.
Astronomy Astrophysics manuscript no. (2008)
Will Be Inserted, Antonella Natta, Leonardo Testi
We discuss the spectral energy distribution of three very low mass objects in Chamaeleon I for which ground-based spectroscopy and photometry as well as ISO measurements in the mid-infrared are...
Infrared and Millimetric Study of the Young Outflow Cepheus E (2008)
Alberto Noriega-crespo, Sergio Molinari, Leonardo Testi, Anneila Sargent
The Cepheus E outflow has been studied in the mid and far infrared using the ISO CAM and LWS instruments, and at millimetric wavelengths using OVRO. In the near and mid-IR, its morphology is similar...
Science case for 1 mas spectro-imagining in the near-infrared (2008)
Garcia, Paulo J. V., Berger, Jean-Philippe, Marconi, Alessandro, Krivov, Alexander, Chiavassa, Andrea, Aringer, Bernard, ...
We present the work developed within the science team of the Very Large Telescope Interferometer Spectro-Imager (VSI) during the Phase A studies. VSI aims at delivering ~ 1 milliarcsecond resolution...
The search for YSOs from ISOGAL data - Application to the l = +45 field (2007)
Marcello Felli, Gianni Comoretto, Leonardo Testi, Alain Omont
. The 7 and 15 m observations of the Galaxy obtained by the ISOGAL program offer an unique possibility to investigate and separate the different populations of stars in the Galactic Plane, in...
The Density Structure of Highly Compact H (2007)
Regions Jos'e Franco, Stan Kurtz, Peter Hofner, Leonardo Testi, Marco Martos
We report the density structure of the ultracompact H ii (UC Hii) regions G35.20\Gamma1.74, G9.62+0.19-E, and G75.78+0.34-H 2 O. The density profiles are derived from radio continuum emission at...
Multi Field imaging with the OVRO millimeter array (2007)
Leonardo Testi And, Leonardo Testi, Anneila I. Sargent
. We review some of the basic guidelines used to plan, execute and analyse multi-eld observations at the Owens Valley Radio Observatory millimeter wave array. As a working example we discuss our...
Star formation in clusters: early sub-clustering in the Serpens core (2007)
Leonardo Testi Anneila, Leonardo Testi, Anneila I. Sargent, Luca Olmi, Joseph S. Onello
We present high resolution interferometric and single dish observations of molecular gas in the Serpens cluster-forming core. Star formation does not appear to be homogeneous throughout the core, but...
Astronomy And Astrophysics (2007)
Near-Infrared Images, Leonardo Testi, Marcello Felli, Paolo Persi, Miguel Roth
. We present sensitive high resolution near infrared (NIR) broad band (J, H, and K) observations of a sample of 31 Star Forming Regions (SFRs) which contain H 2 O and OH maser sources. The...
Young massive stars in the ISOGAL survey - I. VLA observations of the ISOGAL l=+45 field (2007)
Leonardo Testi, Marcello Felli, Gregory B. Taylor
. We present VLA radio continuum observations at 3.6 and 6 cm of a ¸0.65 sq. deg. field in the galactic plane at l = +45 ffi . These observations are meant to be used in a comparison with ISO...
Astronomy And Astrophysics (2007)
The Onset, Leonardo Testi, Francesco Palla, Antonella Natta
. The large body of near infrared observations presented in Testi et al. (1997; 1998) are analysed with the aim of characterizing the young stellar clusters surrounding Herbig Ae/Be stars. The...
A search for clustering around Herbig Ae/Be stars (2007)
Leonardo Testi, Francesco Palla, Timo Prusti, Antonella Natta, Silvia Maltagliati
. We present the results of new near-infrared observations of the fields around a sample of 19 Herbig Ae/Be stars. The observations reveal the population of young stars that accompanies the formation...
IRAS 23385+6053: A Prototype Massive Class 0 Object (2007)
Sergio Molinari, Leonardo Testi, Riccardo Cesaroni, Francesco Palla
IRAS 23385+6053 is a Young Stellar Object with luminosity ¸ 1:6 \Theta 10 4 L fi at a kinematic distance of 4.9 kpc. This candidate precursor of an ultracompact Hii region is associated with a...
Star formation in clusters: a survey of compact mm-wave sources in the Serpens core (2007)
Leonardo Testi, Anneila I. Sargent
We report the results of a millimeter interferometric survey of compact 3 mm continuum sources in the inner 5:5 0 \Theta 5:5 0 region of the Serpens core. We detect 32 discrete sources above 4:0...
HII and hot dust emission around young massive stars in (2007)
Leonardo Testi, Paolo Persi, Miguel Roth
. In this paper we present new near infrared (NIR) observations (J, H, and K broadbands), of the G9:62 + 0:19 star forming complex. Comparison of our observations with similar resolution centimetric...
A multiwavelength picture of the AFGL5142 star-forming region (2007)
Todd Hunter, Leonardo Testi, Gregory B. Taylor, Gianni Tofani, Marcello Felli, ...
. We present molecular line, H 2 O maser, radio continuum and near infrared maps of the bipolar outflow source AFGL 5142. The high resolution of our molecular CO observations enables us to define the...
Sequential star formation in the Cepheus molecular cloud: the S155/Cepheus B interface. (2007)
Leonardo Testi, Luca Olmi, Leslie Hunt, Gianni Tofani, Marcello Felli, Paul Goldsmith
. In this paper we present new radio and nearinfrared observations of a bright Hff knot located southeast of the Cepheus OB3 association, near the ionization front that divides the S155 diffuse H ii...
A search for clustering around Herbig Ae/Be stars (2007)
Ii Atlas, Leonardo Testi, Francesco Palla, Antonella Natta
. We present large field infrared images of a sample of 45 Herbig Ae/Be stars. Stellar parameters, such as age and mass, have been derived for all of them in a consistent way. The images have been...
IRAS 23385+6053: A Prototype Massive Class 0 Object (2007)
Sergio Molinari, Leonardo Testi, Riccardo Cesaroni, Francesco Palla
IRAS 23385+6053 is a Young Stellar Object with luminosity ¸ 1:6 \Theta 10 4 L fi at a kinematic distance of 4.9 kpc. This candidate precursor of an ultracompact Hii region is associated with a...
Star formation in the S235A-B complex (2007)
Marcello Felli, Leonardo Testi, Riccardo Valdettaro
. We present near infrared broad band (J,H and K) and narrow band (H 2 S(1) 1 ! 0 and Brfl) images, and high resolution molecular observations (C 34 S(2-1), (32) , (5-4) and 13 CO(2-1)) around the...
Astronomy Astrophysics manuscript no. (2007)
Will Be Inserted, Antonella Natta, Leonardo Testi, Ernesto Oliva, Giovanni Comoretto, Sandro Gennari
This paper discusses evidence for and properties of disks associated to brown dwarfs in the starforming region Oph. We selected nine objects from the ISOCAM survey of Bontemps et al. 2001 that have...
Astronomy Astrophysics manuscript no. (2007)
Will Be Inserted, Leonardo Testi, Francesca Bacciotti, Anneila I. Sargent, Thomas P. Ray
We present high angular resolution millimeter wavelength continuum and CO(2-1) observations of the circumstellar disk surrounding the TTauri star DG Tauri. We show that the velocity pattern in the...
Astronomy Astrophysics manuscript no. (2007)
Will Be Inserted, Marcello Felli, Leonardo Testi, Alain Omont
The 7 and 15 m observations of selected elds in the Galactic Plane obtained with ISOCAM during the ISOGAL program oer an unique possibility to search for previously unknown YSOs, undetected by IRAS...
Unveiling the Launching Region of YSO Jets with AMBER (2007)
Francesca Bacciotti, Leonardo Testi, Alessandro Marconi, Thomas P. Ray, Catherine Dougados
The interplay between accretion and ejection in the environment of young stellar objects (YSOs) is believed to be a crucial element in the star formation process. Since most of the properties of the...
Infall of gas as the formation mechanism of stars up to 20 times more massive than the Sun (2006)
Beltran, Maria T., Cesaroni, Riccardo, Codella, Claudio, Testi, Leonardo, Furuya, Ray S., Olmi, Luca
Theory predicts and observations confirm that low-mass stars (like the Sun) in their early life grow by accreting gas from the surrounding material. But for stars ~ 10 times more massive than the Sun...
Large dust grains in the inner region of circumstellar disks (2006)
Isella, Andrea, Testi, Leonardo, Natta, Antonella
CONTEXT: Simple geometrical ring models account well for near-infrared interferometric observations of dusty disks surrounding pre-main sequence stars of intermediate mass. Such models demonstrate...
The IMF and Star Formation History of the Stellar Clusters in the Vela D Cloud (2005)
Massi, Fabrizio, Testi, Leonardo, Vanzi, Leonardo
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) IRAS sources. The...
Beltran, Maria T., Brand, Jan, Cesaroni, Riccardo, Fontani, Francesco, Pezzuto, Stefano, Testi, Leonardo, ...
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, mostly with dec <...
Garcia, Paulo J. V., Berger, Jean-Phillipe, Corradi, Romano, Forveille, Thierry, Harries, Tim, Henri, Gilles, ...
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 times more...
A resolved outflow of matter from a Brown Dwarf (2005)
Whelan, Emma T., Ray, Thomas P., Bacciotti, Francesca, Natta, Antonella, Testi, Leonardo, Randich, Sofia
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 seen in young stars,...
Spatially resolved PAH emission in the inner disks of Herbig Ae/Be stars (2005)
Habart, Emilie, Natta, Antonella, Testi, Leonardo, Carbillet, Marcel
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. We detect the...
A detailed study of the rotating toroids in G31.41+0.31 and G24.78+0.08 (2005)
Beltran, Maria T., Cesaroni, Riccardo, Neri, Roberto, Codella, Claudio, Furuya, Ray S., Testi, Leonardo, ...
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 massive toroids...
J. V. Garcia, Paulo, Berger, Jean-Phillipe, Corradi, Romano, Forveille, Thierry, Harries, Tim, Henri, Gilles, ...
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 times more...
J. V. Garcia, Paulo, Berger, Jean-Phillipe, Corradi, Romano, Forveille, Thierry, Harries, Tim, Henri, Gilles, ...
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 times more...
J. V. Garcia, Paulo, Berger, Jean-Phillipe, Corradi, Romano, Forveille, Thierry, Harries, Tim, Henri, Gilles, ...
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 times more...
J. V. Garcia, Paulo, Berger, Jean-Phillipe, Corradi, Romano, Forveille, Thierry, Harries, Tim, Henri, Gilles, ...
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 times more...
Rotating disks in high-mass young stellar objects (2003)
Beltran, Maria T., Cesaroni, Riccardo, Neri, Roberto, Codella, Claudio, Furuya, Ray S., Testi, Leonardo, ...
We report on the detection of four rotating massive disks in two regions of high-mass star formation. The disks are perpendicular to known bipolar outflows and turn out to be unstable but long lived....
We review recent high spatial resolution millimeter continuum and spectral line observations of (proto-)cluster regions. These observations reveal that the mass distribution of prestellar cores is...
The Onset of Cluster Formation around Intermediate Mass Stars (2000)
Testi, Leonardo, Palla, Francesco, Natta, Antonella
We present the results of a recent near-infrared survey of the fields surrounding a large sample of intermediate-mass pre-main-sequence (Herbig Ae/Be) stars. While late-type Be and Ae stars are never...
Star formation in clusters: a survey of compact mm-wave sources in the Serpens core (1998)
Testi, Leonardo, Sargent, Anneila
We report the results of a millimeter interferometric survey of compact 3 mm continuum sources in the inner 5.5'x5.5' region of the Serpens core. We detect 32 discrete sources above 4.0 mJy/beam, 21...
IRAS 23385+6053: A Prototype Massive Class 0 Object (1998)
Molinari, Sergio, Testi, Leonardo, Brand, Jan, Cesaroni, Riccardo, Palla, Francesco
IRAS 23385+6053 is a Young Stellar Object with luminosity 16,000 solar luminosities at a kinematic distance of 4.9 kpc. This candidate precursor of an ultracompact HII region is associated with a...
Sub-arcsec resolution infrared images of the star forming region G 35.20-1.74 (1997)
Paolo Persi, Marcello Felli, Miguel Roth, Leonardo Testi
. We present J(1.25 ¯m), H(1.65 ¯m), K(2.2 ¯m), H 2 (2.125 ¯m) and 11.2 ¯m infrared images at subarcsec resolution of an area centered around the star forming region G 35.20--1.74. In J, H and K...
A Multiwavelength Picture of the AFGL 5142 Star-forming Region (1995)
Hunter, Todd R., Testi, Leonardo, Taylor, Greg B., Felli, Marcello, Tofani, Gianni, Phillips, Thomas G.
We present molecular line, H2O maser, radio continuum and near infrared maps of the bipolar outflow source AFGL5142. The high resolution of our molecular CO observations enables us to define the...
John Bally, Leonardo Testi, Anneila Sargent, John Carlstrom
We present 1.3 millimeter wavelength interferometric observations of two fields containing 6 externally illuminated young stellar objects embedded within the Orion Nebula that have been observed with...