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ESPaDOnS: examples of frames http://webast.ast.obs-mip.fr/magnetisme/espadons_new/frames.html Examples of flat field frames polarimetric configuration (2 fibres and 3 slices per fibre) ESPaDOnS examples of frames Below are some example flat field frames (close-up views) corresponding to different instrument configurations. One can notice in particular that: two sets of interleaving orders are present in the left image (polarimetric configuration) while only one set of orders shows up on the other two images (’object only’ spectroscopic configuration); the number of slices per spectrum is different for the different setups, each spectrum being divided into 3, 4 and 6 thin stripes on the left, middle and right image respectively, with the two side stripes being slightly weaker than the middle ones. ’object only’ spectroscopic configuration (1 fibre and 4 slices per fibre) ’object only’ spectroscopic configuration (1 fibre and 6 slices per fibre) Note that the second image corresponds to a configuration not offered for observations as it gives no advantage over the official ’object only’ spectroscopic configuration (1 fibre, 6 slices per fibre) depicted in the third image. It is only displayed here as an illustration of how ESPaDOnS behaves. Examples of Th/Ar and Fabry-Perot frames These are now example comparison frames (close-up views) of different types (Th/Ar and Fabry-Perot) and for 2 different instrument configurations (polarimetric and object only’ spectroscopic configurations). In addition to what was noted on the flat field frames above, one can observe here that: thorium lines are very numerous and rather narrow in the vertical (ie grating dispersion) direction, with a full width at half maximum of order 1.5 pxl (the exact value being 1.7 and 1.4 pxl for the left and right image respectively); although wider than the thorium lines, the Fabry-Perot interference features are well defined and very regular, 1 of 3 08/07/04 11:35 PM
ESPaDOnS: examples of frames http://webast.ast.obs-mip.fr/magnetisme/espadons_new/frames.html offering a very interesting alternative to Th/Ar lamps for tasks such as estimating the spectrograph slit tilt and shape. Th/Ar frame, polarimetric configuration Fabry-Perot frame, polarimetric configuration Th/Ar frame, ’object only’ spectroscopic configuration The spectral resolutions associated to the left and right image are equal to 69,000 and 81,000 respectively. Examples of polarimetric frames 2 of 3 08/07/04 11:35 PM
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Page 59 and 60: CFHT’s Web page for ESPaDOnS http
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Page 63 and 64: ESPaDOnS: instrument details and co
Page 65 and 66: ESPaDOnS: spectral domain and resol
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Page 69 and 70: ESPaDOnS: thermal response and spec
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Page 75 and 76: ESPaDOnS: control software and user
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Page 79 and 80: ESPaDOnS: temperature and pressure
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Page 101: ObservatoryManual - Maps http://www
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