lect27 - UCF Physics AST 5765/4762(Advanced Astronomical...

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UCF Physics: AST 5765/4762: (Advanced) Astronomical Data Analysis Fall 2009 Lecture Notes: 27. Spectroscopic Calibration and Applications 1 Check In: 12:30 — 12:35, 5 min Questions? 2 Calibration Sources: 12:35 — 12:45, 10 min Common calibration sources: Source Wavelength Resolution Doppler Slit Shifts Extra Time Object any depends on object incl. incl. no OH - sky lines near IR R > 600 to resolve blends no no no Lamp: He, Ne, Ar, Xe UV–near IR all, watch blends no no yes Planetary nebulae (H, He) visible–mid IR low only (few lines) extra maybe yes Star lines UV, near IR depends on line extra? extra yes Telluric lines in starlight near IR depends on line no extra yes 3 Calibration Observations: 12:45 — 12:50, 5 min How often? Often enough to make sure the “solution” (fit) has not changed significantly Depends on: Instrument mechanics (flexure) Instrument temperature changes Resolution How accurate a calibration the program requires (i.e., what’s“significant”) 17specflex 4
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