Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110.1087l&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 751, pp. 1087-1097.
Astronomy and Astrophysics
Astronomy
7
Stars: Binaries: General, Infrared Radiation, Instrumentation: Detectors, Instrumentation: Miscellaneous, Techniques: Image Processing, Stars: Pre-Main-Sequence
Scientific paper
A new 1-5 μm high-resolution camera dedicated to the ESO adaptive optics system ADONIS has been developed as a collaborative project of Observatoire de Paris-Meudon and Observatoire de Grenoble, under ESO contract. Since this camera has been designed to correctly sample the diffraction, two focal plate scales are available: 36 mas pixel^-1 for the 1-2.5 μm range and 100 mas pixel^-1 for the 3-5 μm range, yielding fields of view of 4.5"x4.5" and 12.8"x12.8", respectively. Several broadband and narrowband filters are available as well as two circular variable filters, allowing low spectral resolution (R~60-120) imagery between 1.2 and 4.8 mum. This camera is equipped with a 128x128 HgCdTe/CCD array detector built by the CEA-LETI-LIR (Grenoble, France). Among its main characteristics, this detector offers a remarkably high storage capacity (more than 10^6 electrons) with a total system readout noise of ~1000 electrons rms, making it particularly well suited for long integration time imagery in the 3-5 μm range of the near-infrared domain. The measured dark current is 2000 electrons s^-1 pixel^-1 at the regular operating temperature of 77 K, allowing long exposure times at short wavelengths (lambda<3 μm), where the performances are readout-noise limited. At longer wavelengths (lambda>3 μm), the performances are background-noise limited. We have estimated the ADONIS + COMIC imaging performances using a method specially dedicated to high angular resolution cameras.
Beuzit Jean Luc
Bonaccini Domenico
Feautrier Ph.
Geoffray Herve
Gigan Pierre
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