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19 papers found.
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Interferometric imaging tests for the Large Binocular Telescope

We present an experiment of interferometric imaging for the Large Binocular Telescope (LBT), conducted at the 1.5 m TIRGO infrared telescope. The raw data were produced by simulating the LBT pupil with a mask on the secondary mirror. Two different conditions of , where is the single aperture diameter and the Fried parameter, were simulated by the choice of ; field rotation was...

Sub-Airy disk angular resolution with high dynamic range in the near-infrared

. Fors , A. Richichi , X. Otazu , J. Nuñez , A &A, 480 , 297 ( 2008 ) [2] A. Richichi , O. Fors , E. Mason , J. Stegmeier , T. Chandrasekhar , A &A, 489 , 1399 ( 2008 )

Lunar occultations of 184 stellar sources in two crowded regions toward the Galactic bulge

Context. Lunar occultations (LO) provide a unique combination of high angular resolution and sensitivity at near-infrared wavelenghts. At the ESO Very Large Telescope, it is possible to achieve about 1 milliarcsecond (mas) resolution and detect sources as faint as K  ≈  12 mag.Aims. We have taken advantage of a passage of the Moon over two crowded and reddened regions in the...

A list of bright interferometric calibrators measured at the European Southern Observatory Very Large Telescope Interferometer*

In a previous publication, we described a program of observations of candidate calibrator stars at the European Southern Observatory Very Large Telescope Interferometer (VLTI), and presented the main results from a statistical point of view. In the present paper, we concentrate on establishing a new homogeneous group of bright interferometric calibrators, based entirely on...

Aldebaran's angular diameter: How well do we know it?

The bright, well-known K5 giant Aldebaran, α Tau, is probably the star with the largest number of direct angular diameter determinations, achieved over a long time by several authors using various techniques. In spite of this wealth of data, or perhaps as a direct result of it, there is not a very good agreement on a single angular diameter value. This is particularly unsettling...

CHARM: A Catalog of High Angular Resolution Measurements

The Catalog of High Angular Resolution Measurements (CHARM) includes most of the measurements obtained by the techniques of lunar occultations and long-baseline interferometry at visual and infrared wavelengths, which have appeared in the literature or have otherwise been made public until mid-2001. A total of 2432 measurements of 1625 sources are included, along with extensive...

A new wavelet-based approach for the automated treatment of large sets of lunar occultation data

, 71 Richichi, A. 2007 , ESO Workshop The power of optical/IR interferometry: recent scientific results and 2nd generation VLTI instrumentationi , ed. A. Richichi , F. Delplancke , F. Paresce , & A

CHARM2: An updated Catalog of High Angular Resolution Measurements

We present an update of the Catalog of High Angular Resolution Measurements (CHARM, Richichi & Percheron [CITE], A&A, 386, 492), which includes results available until July 2004. CHARM2 is a compilation of direct measurements by high angular resolution methods, as well as indirect estimates of stellar diameters. Its main goal is to provide a reference list of sources which can be...

Interferometric imaging tests for the Large Binocular Telescope

We present an experiment of interferometric imaging for the Large Binocular Telescope (LBT), conducted at the 1.5 m TIRGO infrared telescope. The raw data were produced by simulating the LBT pupil with a mask on the secondary mirror. Two different conditions of , where is the single aperture diameter and the Fried parameter, were simulated by the choice of ; field rotation was...

Detection of a subarcsecond dust shell around the Wolf-Rayet star WR 112

S. Ragland 0 A. Richichi 0 0 Osservatorio Astrofisico di Arcetri , L.go Enrico Fermi 5, I-50125 Firenze , Italy A B S T R A C T A lunar occultation event of the Wolf-Rayet star WR 112 (type WC9

Near-IR speckle imaging of massive young stellar objects

, ApJ, 449 , 874 Hoare , M. G. , Glindemann , A. , & Richichi , A. 1996 , in The Role of Dust in the Formation of Stars , Proc. of the ESO Workshop Held at Garching, ed. H. U. Käufl, & R. Siebenmorgen, 35

Halos around Herbig Ae/Be stars -more common than for the less massive T Tauri stars

We present sub-arcsec observations of a sample of 31 Herbig Ae/Be and related stars obtained with the technique of near-infrared speckle interferometry. In 18 of the 31 stars we find evidence for circumstellar halos. These halos have a typical size of 1.1

The Calar Alto lunar occultation program: update and new results

Catalog maintained at the U.S. Naval Observatory. The paper has been improved by several detailed references provided by the referee, Dr. B. Mason. A. Richichi et al.: The Calar Alto lunar occultation

Resolving the compact dusty discs around binary post-AGB stars using N-band interferometry

We present the first mid-IR long baseline interferometric observations of the circumstellar matter around binary post-AGB stars. Two objects, SX Cen and HD 52961, were observed using the VLTI/MIDI instrument during Science Demonstration Time. Both objects are known binaries for which a stable circumbinary disc is proposed to explain the SED characteristics. This is corroborated...

Near-infrared interferometry of η Carinae with spectral resolutions of 1 500 and 12 000 using AMBER/VLTI

. Magnard A. Marconi G. Mars G. Martinot-Lagarde P. Mathias P. Mège J.-L. Monin D. Mouillet D. Mourard E. Nussbaum K. Ohnaka J. Pacheco C. Perrier Y. Rabbia S. Rebattu F. Reynaud A. Richichi A. Robini M ... power of optical/IR interferometry: recent scientific results and 2nd generation VLTI instrumentation , ed. F. Delplancke , A. Richichi , [astro-ph/0509208] Petrov , R. G. , Malbet , F. , Weigelt , G

Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD 104237

. Martinot-Lagarde P. Mathias P. Mège J.-L. Monin D. Mouillet D. Mourard E. Nussbaum K. Ohnaka J. Pacheco C. Perrier Y. Rabbia S. Rebattu F. Reynaud A. Richichi A. Robini M. Sacchettini D. Schertl M. Schöller

Interferometric data reduction with AMBER/VLTI. Principle, estimators, and illustration

Aims.In this paper, we present an innovative data reduction method for single-mode interferometry. It has been specifically developed for the AMBER instrument, the three-beam combiner of the Very Large Telescope Interferometer, but it can be derived for any single-mode interferometer.Methods.The algorithm is based on a direct modelling of the fringes in the detector plane. As...