Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..511s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 511-518
Astronomy and Astrophysics
Astronomy
9
Data Reduction, Infrared Astronomy, Instruments, Light Transmission, Orion Nebula, Spatial Distribution, Black Body Radiation, Fabry-Perot Interferometers, Field Of View, Telescopes, Wavelengths
Scientific paper
We have developed a Fabry-Perot imager at the Nasmyth focus of the Communications Research Laboratory (CRL) 1.5 m telescope. The field of view of the camera is 4.0 min x 4.0 min, which is the largest among near-infrared Fabry-Perot imagers. In order to make the velocity shift in the field of view small, we chose a long focal length for the collimator (approximately 470 mm). The accurate parallelism of reflecting surfaces, 5 nm, is achieved by systems including a He-Ne laser and Si photodiodes. This gives an effective finesse of approximately 50. Wavelength calibration is carried out by using a Kr lamp. This calibration includes a correction for wavelength-dependent phase changes in the reflective coatings of the etalon. Using this Fabry-Perot imager, we obtained Br gamma and Pa beta images of the Orion Nebula, including the Bright Bar and a part of the Trapezium. From these images we obtained the distribution of extinction in this area. We found that there are regions with a tendency for the Br gamma/Pa beta intensity ratio to be larger at a place with a larger Br gamma intensity. We conclude that in such regions dust grains exist within the ionized region, causing the extinction.
Aoki Tetsuo
Hiromoto Norihisa
Inoue Motoko Y.
Kataza Hirokazu
Kawabata Hironobu
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