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Unformatted text preview: Spectrograph Optics: 12:45 1:10, 25 min Collimated beam at grating, or beam and dispersion angles mixed Review of making a spectrum from an image Input image now smeared in R determined by PSF size: true spectrum convolved by PSF BUT, we can pass light through a slit to reduce PSF 1 Spectrograph optics Discard light, but improve R Avoid nearby objects contaminating spectrum Can use mirrored slit, send rest of image to slit-viewing camera Camera can guide exposure Camera can monitor slit placement 4 Long-Slit Spectroscopy: 1:10 1:25, 15 min 14specextract Slit usually covers entire detector (why else?) Star is only part of the slit Can get sky background spectrum next to star Extended objects bigger, may or may not fill slit Scan slit: spatial-spectral hypercube Can also allow planet to rotate under slit 2...
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This note was uploaded on 11/09/2009 for the course AST 4762 taught by Professor Harrington during the Fall '09 term at University of Central Florida.
- Fall '09