The Palomar Testbed Interferometer Calibrator Catalog
نویسندگان
چکیده
منابع مشابه
The Palomar Testbed Interferometer
The Palomar Testbed Interferometer (PTI) is a long-baseline infrared interferometer located at Palomar Observatory, California. It was built as a testbed for interferometric techniques applicable to the Keck Interferometer. First fringes were obtained in July 1995. PTI implements a dual-star architecture, tracking two stars simultaneously for phase referencing and narrow-angle astrometry. The t...
متن کاملAtmospheric Turbulence Measurements with the Palomar Testbed Interferometer
Data from the Palomar Testbed Interferometer, with a baseline length of 110 m and an observing wavelength of 2.2 μm, were used to derive information on atmospheric turbulence on 64 nights in 1999. The measured two-aperture variance coherence times at 2.2 μm ranged from 25 msec to 415 msec (the lower value was set by instrumental limitations—the interferometer could not operate when the coherenc...
متن کاملFringe visibility estimators for the Palomar Testbed Interferometer
Visibility estimators and their performance are presented for use with the Palomar Testbed Interferometer (PTI). One operational mode of PTI is single-baseline visibility measurement using pathlength modulation with synchronous readout by a NICMOS-3 infrared array. Visibility is estimated from the fringe quadratures, either incoherently, or using source phase referencing to provide a longer coh...
متن کاملPalomar Testbed Interferometer Observations of Young Stellar Objects
We present observations of a sample of Herbig AeBe stars, as well as the FU Orionis object V1057 Cygni. Our K-band (2.2μm) observations from the Palomar Testbed Interferometer (PTI) used baselines of 110m and 85m, resulting in fringe spacings of ∼ 4mas and 5mas, respectively. Fringes were obtained for the first time on V1057 Cygni as well as V594 Cas. Additional measurements were made of MWC147...
متن کاملDifferential Astrometry of Sub-arcsecond Scale Binaries at the Palomar Testbed Interferometer
We have used the Palomar Testbed Interferometer to perform very high precision differential astrometry on the 0.25 arcsecond separation binary star HD 171779. In 70 minutes of observation we achieve a measurement uncertainty of ≈ 9 micro-arcseconds in one axis, consistent with theoretical expectations. Nightto-night repeatability over four nights is at the level of 16 micro-arcseconds. This met...
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ژورنال
عنوان ژورنال: The Astrophysical Journal Supplement Series
سال: 2008
ISSN: 0067-0049,1538-4365
DOI: 10.1086/526548