Hello Christian Sorry but I do not understand any longer. Some time ago you blamed Stephane Charbonnel when he used 3X3 binning with a 35µ slit. You claimed...
Hi Patrick, In the example Christian gave the link to he is using an Atik 314L and as this has 6.45um pixels then a slit larger than 12.9um will satisfy the...
Patrick, Lot of CCD cameras have now pixels size lower than 19/2=9.5µm: KAF400 and KAF1600: 9µm KAF8300: 5.4µm KAF3200: 6.8µm ICX285 (Atik 314L+): 6.45µm ...
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patrick lailly
patrick.lailly@...
Feb 1, 2012 10:04 am
Hi Bernard I agree with you. Nyquist's criterion is fulfilled with an Atik 314L+ camera and a 19µ slit. However we approach the limit sampling and this can...
Hi, The picture on Wikipedia shows it quite well I think. http://en.wikipedia.org/wiki/Equivalent_width It is a measure of the strength of the line. You make a...
Patrick, your geometric calculation of spectral resolution is only an approximation. Optical aberations can also impact the performance. For me, LHIRES III + ...
Hi~~Dear Mr. Buil:  Then my CCD camera is QHY6Pro which has pix 8.6 ~8.3um, CCD is SONY ICX429AL  Which slit is the most suitable for my LHIRES3? 19um or...
is it possible to msimulated the desfourneau tehcic qhit a lisa est t'il possible de simuler la tehnique de desfourneau avec un lia jacques 47'n 71'W A ARAS...
Dear Dong Li, Happy new Dragon year! Seeing can be measured by taking a long exposure image with your CCD (without spectrograph, at telescope prime focus) and...
Here a method for measure true "slit transmission" : http://www.spectro-aras.com/forum/viewtopic.php?f=8&t=237 The test is recommanded for evaluation of your...
 Dear Mr. Thizy, my respected teacher,  Thank you very much for the detailed explanations! I feel so happy and they are so useful for me in the future...
... Can someone explain this in plain English :-) -Adam...
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stanlep@...
Feb 3, 2012 3:51 am
When making a graph of Radial Velocity vs. Time, is it acceptable in the scientific community to plot the absolute value of the RV in instead of the signed...
Hi Stan, If you are plotting the data for public consumption I would say it should definitely be signed. If you leave off the sign then the assumption will be...
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stanlep@...
Feb 3, 2012 5:03 am
... Hi Bernard and All, As I said, I know the arguments, one of which you pointed out. Whether or not using the absolute value is abhorrent to the preference...
Adam, the method is very simple: 1/ take a spectrum of a star with your spectrograph with the slit 2/ remove the slit, make sure no light foes through the new...
Adam, the new slits are made with a glass and a chromium surface which actually makes the slit. The new slit makes the guiding image cleaner than the old one...
 Me ,too~~ and especially I can never open the forum  Can Mr. Buil copy this topic,article and the related pictures and send them to me? ... From:...
To follow up, I think my question was not necessary. On thinking about this some more, I think one can use whatever graph they want if it better illustrates...
Hi Stan, The sign is a key parameter of an RV measurement and you always know it so why would you not include it? In fact I would say it is always important to...
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stanlep@...
Feb 5, 2012 1:35 am
... I already answered this question when I said "I think one can use whatever graph they want if it better illustrates the point the person is trying to ...
Stan, if the RV is always negative, you can plot -RV to get positive values if you prefere. But if RV is swinging aroung 0 and is sometimes positive and...
If anyone is looking for a "Filly" lamp for calibration, this eBay listing might be of interest http://www.ebay.co.uk/itm/320843247067 The seller claims to...
Thanks Robin, but from the color, i think that it is the neon model lamp, still available in France for 5€. It is not the famous blue model, more useful for...
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Stan Gorodenski
stanlep@...
Feb 6, 2012 4:20 pm
Robin, Thanks for the heads up. However, I believe one has to also buy a converter or power source so that it will work in the U.S. Is that correct? Stan...
