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Near Infrared High Angular Resolution Observations of Stars and Circumstellar Regions by the Technique of Lunar Occultations

Published online by Cambridge University Press:  19 July 2016

T. Chandrasekhar ,
N. M. Ashok  and
Sam Ragland
T. Chandrasekhar
Affiliation:
IR Astronomy Area, Physical Research Laboratory, Ahmedabad 380 009, India
N. M. Ashok
Affiliation:
IR Astronomy Area, Physical Research Laboratory, Ahmedabad 380 009, India
Sam Ragland
Affiliation:
IR Astronomy Area, Physical Research Laboratory, Ahmedabad 380 009, India

Abstract

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A program of High Angular Resolution observations of stars and their circumstellar regions using the technique of lunar occultations has been initiated at the 1.2 m telescope at Gurushikhar (24°39′ N, 72°47′ E), India. A liquid nitrogen cooled InSb detector based high speed Infrared photometer with millisecond data acquisition capabilities has been developed for the near Infrared region (1–5 μm) and eight occultations have been successfully observed in the K band (2.2 μm). The sources are (IRC No. -10578, +10013, +20034, +30094, +20190, +20200, +20073 and +00198. The diffraction pattern is clearly seen in all the observations. A convolution analysis involving the system frequency response, filter bandwidth and one dimensional source structure has been carried out to fit the data. System capability has been determined to be ~ 6 milliarcseconds.

Type
Imaging Results: Optical and Infrared
Information
Symposium - International Astronomical Union , Volume 158: Very High Angular Resolution Imaging , 1994 , pp. 376 - 378
Copyright
Copyright © Kluwer 1994 

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