Well, after a false start with calibrating my CCD chip I think (thanks Robin!) that I'm back on track. This means, of course, that the sky has been resolutely...
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May 4, 2006 6:47 pm
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Is the dispersion of the SA100 (running at about 4 angstroms / pixel) likely to be linear? If not, should I be multiplying by the COS or SIN or whatever of...
I took a peak, Brendan. Very nice. I am looking forward to hear the answers to your questions too. I have been stuck for some time in the calibration mode. I...
... taken about 5 or 6 spectra so far but haven't been able to figure out the calibration. ... Bob - I used a spectrum of Vega that I took and a reference...
Hi Bob, Where are you stuck? Do you have a spectrum of Vega or another A class stars showing Hydrogen lines? You can use these to calibrate your spectrum. Once...
Hi Brendan, The Star Analyser linearity error is very small The formula for the angle of dispersion is sin A = m.w where A is the angle m is the lines/mm and w...
Hi Bob, Where are you stuck? Do you have a spectrum of Vega or another A class stars showing Hydrogen lines? You can use these to calibrate your spectrum. Once...
Hi Brendan, The match looks very nice up to around 7000A. The library spectrum will have had the atmospheric (Telluric lines) removed and you have correctly...
Seem to be having problems with posting messages - either major delays or Yahoo has tossed my last two posts. This just to see if anything is getting through....
... instrument ... I put a file in my folder (smoothed curves.jpg) showing the two curves I used to calculate my CCD's response. Have I got the continuum for...
... Could you draw a diagram? :) I wasn't quite sure which angle A and which distance D you were referring to. I kept running into TANs when I drew a diagram. ...
Hi Brendan, You are right of course. The second equation should be P = D tan A and the full equation for the Star Analyser P = D tan(sin-1(100.w) I've no idea...
Well I know the III means it is a giant, a and b should designate if it is more or less luminous than the average of the class. Nu Vir is variable so perhaps...
I read here for about 6 mount and learn a bit more and see you have to take 5 to 8 pictures and put it side by side to have the full spectro . 1-is it ok : do...
Hello Jack, This is technique is not needed with the Star Analyser as it is designed to fit the whole spectrum and the zero order image on one camera frame (It...
Hello, Tom, We received your order on the 2nd May and despatched same day by air letter post. The most likely scenario is that your local customs office is...
From: "tpclark1010" <tpclark1010@...> To: <staranalyser@yahoogroups.com> ... I wouldn't worry, Tom, I'm sure it'll turn up. I ordered mine, by post, late on a...
Has anybody got a graph of an M-class star (ideally M3III) that they could share? My spectra all seem to fall off rapidly after 7300A when compared to...
Dear Group, Copied from my note to QCUIAG as I thought you would be interested... My previous images of comet Schwassmann-Wachmann were of fragment C, but...
Hi Brendan, I have put a graph of Del Vir (M3iii) in my folder in the Files section "Del Vir response calibration" It shows the raw data, the response curve...
... wrote: Tom, Robin - Thanks for the graphs. You raw response seems similar to mine, but my calibrated response is much lower than yours at the long...
I think I am in your camp Brendan. Whenever I try to calibrate a spectrum for the response of my CCD chip, all I get is a lot of foul language and things being...
Hi Tom, Brendan, I would love to help but unfortunately my laptop with Vspec on it has just given up (It starts booting up and then all I get is a blank white...
... <staranalyser@...> wrote: I process my raw spectra by flat-fielding and dark-framing and (for faint spectra) by stacking multiple images. Then I produce a...
Hi Brendan I dont think what value you use to normalise should affect the shape. In the end, your measured spectrum data should fall to zero beyond the...
... It's more a question of what I should use for my "zero" value. ... That would make the values too high, though? Mine are way too low! ... An SXVH9, which...
