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Related papers: Angular diameter estimation of interferometric cal…

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We measured the angular diameters of 44 stars with the Navy Precision Optical Interferometer, obtaining uncertainties on the limb darkened diameter of 2% or less for all but four stars. We then used our diameters with Gaia or Hipparcos…

e present 4 very low mass stars radii measured with the VLTI using the 2.2 microns VINCI test instrument. The observations were carried out during the commissioning of the 104-meter-baseline with two 8-meter-telescopes. We measure angular…

Astrophysics · Physics 2009-11-07 D. Segransan , P. Kervella , T. Forveille , D. Queloz

The uniform disk (UD) angular diameter measurements of two oxygen-rich Mira variables (AW Aur and BS Aur) and three semiregular (SRb) variables (GP Tau, RS Cap, RT Cap), in near Infrared K-band (2.2 micron) by lunar occultation observations…

Solar and Stellar Astrophysics · Physics 2015-05-30 Tapas Baug , T. Chandrasekhar

We discuss VLTI AMBER and MIDI interferometry in addition to single-dish Subaru observations of massive young stellar objects. The observations probe linear size scales between 10 to 1000 AU for the average distance of our sources.

Solar and Stellar Astrophysics · Physics 2009-05-06 W. J. de Wit , M. G. Hoare , R. D. Oudmaijer , T. Fujiyoshi

The interferometric observations of dwarf stars in the solar neighbourhood, combined with Hipparcos parallaxes provide very precise values of their linear diameters. In this paper, we report the direct measurement of the angular diameter of…

Astrophysics · Physics 2009-11-10 P. Kervella , F. Thevenin , P. Morel , P. Borde , E. Di Folco

The surface brightness - color relationship (SBCR) is a poweful tool for determining the angular diameter of stars from photometry. It was for instance used to derive the distance of eclipsing binaries in the Large Magellanic Cloud (LMC),…

We present computer simulations of interferometric imaging with the Very Large Telescope Interferometer (VLTI) of the European Southern Observatory (ESO) and the Astronomical MultiBEam Recombiner (AMBER) phase-closure instrument. These…

Astrophysics · Physics 2015-06-24 F. Przygodda , T. Bloecker , K. -H. Hofmann , G. Weigelt

We present computer simulations of interferometric imaging with the VLT interferometer and the AMBER instrument. These simulations include both the astrophysical modelling of a stellar object by radiative transfer calculations and the…

Astrophysics · Physics 2015-06-24 T. Bloecker , K. -H. Hofmann , F. Przygodda , G. Weigelt

Context: Optical interferometry is a powerful tool for observing the intensity structure and angular diameter of stars. When combined with spectroscopy and/or spectrophotometry, interferometry provides a powerful constraint for model…

Astrophysics · Physics 2009-11-13 Hilding R. Neilson , John B. Lester

Calibration is one of the long-standing problems in optical interferometric measurements, particularly with long baselines which demand stars with angular sizes on the milliarcsecond scale and no detectable companions. While systems of…

Instrumentation and Methods for Astrophysics · Physics 2012-12-05 A. Richichi , O. Fors , F. Cusano , M. Moerchen

Context: In recent years, stellar intensity interferometry has seen renewed interest from the astronomical community because it can be efficiently applied to Cherenkov telescope arrays. Aims: We have investigated the accuracy that can be…

Instrumentation and Methods for Astrophysics · Physics 2022-10-05 Michele Fiori , Giampiero Naletto , Luca Zampieri , Irene Jiménez Martínez , Carolin Wunderlich

Context. The interpretation of stellar pulsations in terms of internal structure depends on the knowledge of the fundamental stellar parameters. Long-base interferometers permit us to determine very accurate stellar radii, which are…

Thanks to their large angular dimension and brightness, red giants and supergiants are privileged targets for optical long-baseline interferometers. Sixteen red giants and supergiants have been observed with the VLTI/AMBER facility over a…

Solar and Stellar Astrophysics · Physics 2015-06-16 P. Cruzalèbes , A. Jorissen , Y. Rabbia , S. Sacuto , A. Chiavassa , E. Pasquato , B. Plez , K. Eriksson , A. Spang , O. Chesneau

The calibration process of long baseline stellar interferometers requires the use of reference stars with accurately determined angular diameters. We present a catalog of 374 carefully chosen stars among the all-sky network of infrared…

Astrophysics · Physics 2015-06-24 Pascal Borde , Vincent Coude du Foresto , Gilles Chagnon , Guy Perrin

Considering radio-interferometric observations, we present a fast and efficient estimator to compute the binned angular bispectrum (ABS) from gridded visibility data. The estimator makes use of Fast Fourier Transform (FFT) techniques to…

Cosmology and Nongalactic Astrophysics · Physics 2025-01-14 Sukhdeep Singh Gill , Somnath Bharadwaj , Sk. Saiyad Ali , Khandakar Md Asif Elahi

With the construction of the VLTI (Very Large Telescope Interferometer of the European Observatory ESO for the southern hemisphere) it is now possible to make observations with resolutions of the order of milli-arc-seconds, especially in IR…

Solar and Stellar Astrophysics · Physics 2017-09-22 M. Hadjara

We have used near- and mid-infrared interferometry to investigate the pulsating atmosphere and the circumstellar environment of the Mira variable RR Aql. Observations were taken with the VLTI/AMBER (near infrared) and the VLTI/MIDI (mid…

Astrophysics · Physics 2009-11-13 Iva Karovicova , Markus Wittkowski , David A. Boboltz , Michael Scholz

We predict mean angular diameters and amplitudes of angular diameter variations for all monoperiodic Pop.I Cepheids brighter than <V> = 8.0mag. The catalog is intended to aid selecting most promising Cepheid targets for future…

Astrophysics · Physics 2016-08-30 P. Moskalik , N. A. Gorynya

We present angular diameters for 42 luminosity class I stars and 32 luminosity class II stars that have been interferometrically determined with the Palomar Testbed Interferometer. Derived values of radius and effective temperature are…

Astrophysics · Physics 2015-05-13 G. T. van Belle , M. J. Creech-Eakman , A. Hart

Surface brightness-colour relations (SBCRs) are used to derive the stellar angular diameters from photometric observations. They have various astrophysical applications, such as the distance determination of eclipsing binaries or the…

Solar and Stellar Astrophysics · Physics 2020-07-07 A. Salsi , N. Nardetto , D. Mourard , O. Creevey , D. Huber , T. R. White , V. Hocdé , F. Morand , I. Tallon-Bosc , C. D. Farrington , A. Chelli , G. Duvert