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A New Calibration Of Galactic Cepheid Period-Luminosity Relations From B To K Bands, And A Comparison To LMC Relations
- P. Fouqué, P. Arriagada, B. Mcarthur
- Physics
- 20 September 2007
Context. The universality of the Cepheid Period-Luminosity relations has been under discussion since metallicity effects have been assumed to play a role in the value of the intercept and, more…
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…
COLDER AND HOTTER: INTERFEROMETRIC IMAGING OF β CASSIOPEIAE AND α LEONIS
- X. Che, J. Monnier, L. Sturmann
- Physics
- 4 May 2011
Near-infrared interferometers have recently imaged a number of rapidly rotating A-type stars, finding levels of gravity darkening inconsistent with theoretical expectations. Here, we present new…
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…
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)…
IMAGING AND MODELING RAPIDLY ROTATING STARS: α CEPHEI AND α OPHIUCHI
- Ming Zhao, J. Monnier, Noao
- Physics, Geology
- 12 June 2009
We present submilliarcsecond resolution imaging and modeling of two nearby rapid rotators α Cephei and α Ophiuchi, obtained with the CHARA array—the largest optical/IR interferometer in the world.…
A catalog of bright calibrator stars for 200-m baseline near-infrared stellar interferometry
- A. Mérand, P. Bordé, V. C. Foresto
- Physics
- 10 December 2004
We present in this paper a catalog of reference stars suitable for calibrating infrared interferometric observations. In the K band, visibilities can be calibrated with a precision of 1% on baselines…
CHARA Array K'-Band Measurements of the Angular Dimensions of Be Star Disks
- D. Gies, William G. Bagnuolo, Jr., P. Koubský
- Physics, Geology
- 18 September 2006
We present the first K′-band, long-baseline interferometric observations of the northern Be stars γ Cas, ϕ Per, ζ Tau, and κ Dra. The measurements were made with multiple telescope pairs of the CHARA…
First Resolved Images of the Eclipsing and Interacting Binary β Lyrae
We present the first resolved images of the eclipsing binary β Lyrae, obtained with the CHARA Array interferometer and the MIRC combiner in the H band. The images clearly show the mass donor and the…
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