Simulations of the STIS CCD clear imaging mode PSF

Astronomy and Astrophysics – Astronomy

Scientific paper

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Hubble Space Telescope, Charge Coupled Devices, Point Spread Functions, Stellar Models, Coronagraphs, Image Processing, Spectrographs, Disks, Scattering, Diffraction, Spectra, Astronomical Photography, Broadband

Scientific paper

Detailed understanding of the properties of the point-spread function (PSF) of Space Telescope Imaging Spectrograph (STIS) imaging modes is necessary to separate real effects of geometrically complex astronomical sources, such as protoplanetary disks surrounding bright stars, from instrumental effects, such as scattering and diffraction. In order to investigate STIS imaging properties we have numerically simulated broadband stellar PSFs generated by STIS in CCD clear imaging mode, including the effects of the Lyot stop and the coronagraphic wedges. The input spectrum is a stellar model atmosphere of the appropriate spectral type, convolved with the pre-flight STIS CCD response function. The PSF modeler generates broadband PSFs by co-adding weighted monochromatic PSFs across the waveband.

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