lect25 - UCF Physics: AST 5765/4762: (Advanced)...

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UCF Physics: AST 5765/4762: (Advanced) Astronomical Data Analysis Fall 2009 Lecture Notes: 25. Spectrum Extraction 1 Check In: 10:30 — 10:35, 5 min Questions? Grad project posted. For note-taking only, may change. 2 Go Over HW8: 10:35 — 11:05, 30 min 3 Slit Width and Resolving Power: 11:05 — 11:10, 5 min The resolving power R = λ/ Δ λ Δ λ is set by the slit width: A wider slit integrates over more wavelength This increases Δ λ and reduces R Usually the slit is 3–10 pixels wide: want to overresolve pixel scale R is related to the dispersion , dβ/dλ : High dispersion is high resolving power and less grasp Deflection angle β translates to distance in pixels in camera 4 Long-Slit Spectroscopy: 11:10 — 11:25, 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 1
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lect25 - UCF Physics: AST 5765/4762: (Advanced)...

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