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VLTI near-IR interferometric observations of Vega-like stars: Radius and age of a PsA, b Leo, b Pic, e Eri and t Cet
- E. Folco, F. Thévenin, P. Morel
- Physics
- 1 November 2004
We report in this paper the direct interferometric measurement of the angular diameter of five nearby Vega-like stars: α PsA, β Leo, β Pic, � Eri and τ Cet. The near-infrared (K and H bands)…
A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty
We present a 0.16% precise and 0.27% accurate determination of R0, the distance to the Galactic center. Our measurement uses the star S2 on its 16-year orbit around the massive black hole Sgr A* that…
Cepheid distances from infrared long-baseline interferometry III. Calibration of the surface brightness-color relations
- P. Kervella, D. Bersier, D. Mourard, N. Nardetto, P. Fouqué, V. C. Foresto
- Physics
- 1 December 2004
The recent VINCI/VLTI observations presented in Paper I have nearly doubled the total number of available angular diameter measurements of Cepheids. Taking advantage of the significantly larger color…
First Results from the CHARA Array. VII. Long-Baseline Interferometric Measurements of Vega Consistent with a Pole-On, Rapidly Rotating Star
- J. Aufdenberg, A. Mérand, N. Turner
- Physics
- 13 March 2006
We have obtained high-precision interferometric measurements of Vega with the CHARA Array and FLUOR beam combiner in the K′ band at projected baselines between 103 and 273 m. The measured visibility…
Interferometric observations of the supergiant stars α Orionis and α Herculis with FLUOR at IOTA
- G. Perrin, S. Ridgway, V. C. Foresto, B. Mennesson, W. Traub, M. Lacasse
- Physics
- 4 February 2004
We report the observations in the K band of the red supergiant star α Orionis and of the bright giant star α Herculis with the FLUOR beamcombiner at the IOTA interferometer. The high quality of the…
Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
- O. Absil, E. Folco, H. Mcalister
- Physics, Geology
- 12 April 2006
Context. Only a handful of debris disks have been imaged up to now. Due to the need for high dynamic range and high angular resolution, very little is known about the inner planetary region, where…
Unveiling Mira stars behind the molecules - Confirmation of the molecular layer model with narrow band near-infrared interferometry
- G. Perrin, S. Ridgway, M. Lacasse
- Physics
- 1 October 2004
We have observed Mira stars with the FLUOR beamcombiner on the IOTA interferometer in narrow bands around $2.2\,\mu$m wavelength. We find systematically larger diameters in bands contaminated by…
Extended envelopes around Galactic Cepheids. II. Polaris and delta Cephei from near-infrared interfe
- A. Mérand, P. Kervella, D. Berger
- Physics
- 1 July 2006
We present the results of long-baseline interferometric observations of the classical Cepheids Polaris and δ Cep in the near infrared K' band (1.9-2.3 μ m), using the FLUOR instrument of the CHARA…
Evidence for Very Extended Gaseous Layers around O-rich Mira Variables and M Giants
- B. Mennesson, G. Perrin, M. Lacasse
- Physics
- 1 November 2002
Nine bright O-rich Mira stars and five semiregular variable cool M giants have been observed with the Infrared and Optical Telescope Array (IOTA) interferometer in both K' (~2.15 μm) and L' (~3.8 μm)…
Data reduction methods for single-mode optical interferometry Application to the VLTI two-telescopes beam combiner VINCI
- P. Kervella, D. Ségransan, V. C. Foresto
- Physics
- 28 June 2004
The interferometric data processing methods that we describe in this paper use a number of innovative techniques. In particular, the implementation of the wavelet transform allows us to obtain a good…
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