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lect26 - UCF Physics AST 5765/4762(Advanced Astronomical...

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UCF Physics: AST 5765/4762: (Advanced) Astronomical Data Analysis Fall 2009 Lecture Notes: 26. Spectroscopic Systematic Corrections 1 Check In: 10:30 — 10:35, 5 min Questions? HW5 back, HW6 imminent 2 Gratings: 10:35 — 10:45, 10 min Diffraction Grating Piece of glass etched with fine lines Works interferometrically, not refractively 15specorder/macke/Diffraction 2 wavlens.pdf At a given angle, certain wavelengths add, others cancel Different orders are different interferences Grating equation: sin α + sin β = nkλ (1) n is blaze frequency, usually in lines/mm k is order number α is incidence angle from normal β is diffraction angle from normal Changing α (grating tilt) changes projected n Also changes center λ and dispersion Grating equation: orders at different wavelength overlap “Order sorting” done with filters Or, can cross-disperse: Low-dispersion element spreads light in one direction High-dispersion element spreads light in other direction 13spec/2-cormass.jpg 1
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3 Things to Correct: 10:45 — 10:50, 5 min Array detector effects Sky emission (continuum and lines, especially OH - lines)
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