Subtraction of well-exposed NICMOS 2 PSFs

Details Subtraction of well-exposed NICMOS 2 PSFs Subtraction of well-exposed NICMOS 2 PSFs

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hstc.work..271k&link_type=abstract

The 1997 HST Calibration Workshop with a New Generation of Instruments, p. 271

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Applications

4

Near Infrared Radiation, Subtraction, Point Spread Functions, Signal To Noise Ratios, Optical Properties, Applications Programs (Computers), Companion Stars, Faint Objects, Radiation Detectors, Imaging Spectrometers, Cameras, Hubble Space Telescope

Scientific paper

A SNAP program (7420) is underway to search for companions to nearby stars using Near Infrared Camera and Multi-Object Spectrometer (NICMOS) 2 (f/45, 0.076 sec/pix). Well-to over-exposed star images are obtained at the center of the detector in four filters: F110W, F180M, F207M, and F222M. The stars are typically saturated to allow for the detection of faint companions. The point spread function (PSF) often fills the entire field of view, with diffraction rings visible out to a radius of 10 sec. The program was designed with the expectation that a large number of the stars would not have any companions or material around them, making them suitable for use as reference PSFs to subtract from other star images. The reference PSF would be shifted and intensity scaled to provide the best subtraction. In addition to the possible discoveries of companions, the high signal-to-noise structures in the wings of these PSFs have provided new, unexpected information on the optical characteristics of the NICMOS 2 camera which cannot be obtained from the current PSF monitoring program.

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