Astronomical Spectroscopy - Physics - University of Cincinnati

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$1 Ch. 22 â Reflection and Refraction of Light 22.1 The ... - Physics$

– 62 – 3.3. Observing Techniques: What Happens at Night One of the goals of this chapter has been to provide observing tips, and possibly the best way of doing this is provide some examples of what some typical nights are actually like. Included here are examples of observing with a long-slit spectrograph, observing with a fiber spectrograph, and some advice on what to do when observing with a NIR spectrometer. A common theme that emerges from these (mostly true) stories is that the observers spend a lot of time thinking through the calibration needs of their programs. For the optical this is mainly an issue of getting the flat-fields “right” (or at least good enough), while there are more subtle issues involved in NIR spectroscopy. Throughout these the same philosophy holds: obtaining useful spectra involves a lot more than just gathering photons at the right wavelength. 3.3.1. Observing with a long-slit spectrograph The GoldCam spectrometer on the Kitt Peak 2.1-meter provides an interesting example of a classical long-slit instrument. The observing program described here was aimed at obtaining good (
– 63 – the only overlap would be with 3000Å from the second order. Given the poor atmospheric transparency at that wavelength, and the extreme red color of such stars, it is safe to assume that there would be negligible contamination. For the red setting (5000-9000Å) there would be overlap with second order light
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Astronomical Spectroscopy Philip Ma
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Page 81 and 82: - 81 - Wrap-Up and Acknowledgements
Page 83 and 84: - 83 - Massey, P., DeVeny, J., Jann
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Astronomical Spectroscopy - Physics - University of Cincinnati

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