Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the staranalyser group. File :...
staranalyser@yahoogro...
Mar 3, 2009 3:53 pm
1417
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the staranalyser group. File :...
staranalyser@yahoogro...
Mar 3, 2009 6:18 pm
1418
I have spent most of the weekend trying to calibrate the response curve of my Meade LPI using Vspec. With the help I have received from this newsgroup I feel...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the staranalyser group. File :...
staranalyser@yahoogro...
Mar 4, 2009 3:14 pm
1420
Hello Pete, I am pleased to see you have been able to make progress. Your wavelength calibration looks correct and is about the same A/pixel as your Gamma Gem...
Hello Robin, the telescope I am using is Meade 10" SN (f/4). I do find it quite difficult to get the spectra in focus and I am aware that when the star is in...
Hi Robin I'm sure Robin will answer shortly and you are asking similar questions to what I have been asking him via PM (grin). Don't think anyone in UK sells...
Greetings all, I wonder if anyone knows the central wavelength of the telluric h20 line in the spectrum of Betelgeuse that shows up as a dip in the spectrum. I...
Surplus Shed sell an adjustable slit 0mm to 3mm ( about $15) which is usable. I've also found some laser cut slits from the US but they start around $120.....
Hello Pete, That setup should work fine. f4 is perhaps a bit faster than optimum (It is a balance between reducing the star size as you go to shorter focal...
Yep, you can build a setup with a slit (you need some extra optics as well to focus on the slit) Alternatively you can try placing the SA in front of a short...
Pete, The H20 lines are detailed in VSpec. Under tools/elements/ line box- atmos You should be able to drop these on your spectra to get the calibration....
Hi Ken, Pete I am not sure the Vspec file covers all of them does it ? (My version only shows the ones round H alpha) You can see them all here though in...
Hi all, Jean-Pierre Masviel has just posted a spectrum of Comet Lulin on spectro-l taken with his nice home built spectrograph designed around the Star...
Roland Bähr has posted on the VdS spectroscopy forum a set of stellar spectra covering the various spectral types. He used the Star analyser with a DSI Pro. I...
Hi All, I just joined this group with an interest in purchasing a Star Analyser. It would seem to be an excellent way of "breaking" into spectroscopy. Would it...
Jim, I've just done some imaging with a Baader 207lpm grating ( basically twice the dispersion of the SA 100lpm) on a 10" LX200 and a Canon 300D camera. I...
I have a special balow that ab le to rever and get reducer of 1.8 maybe also able to rever my ordinary barlow X2 is better jack 47'N 71'W ... the dispersion of...
Hi Jim, The ST9 poses some interesting challenges with its relatively small number of large pixels. 80mm is the minimum I would recommend you use. You could ...
Ken, Jacques, and Robin, Thanks for the quick replies. It looks like my imaging setup should work fairly well for spectroscopy ... particularly at F6.3. Is...
Jim, I think you will find it easier to mount the SA after the reducer. Note Robin's comment about the distance from the SA grating to the CCD. The optmum back...
Supernova sn2009an was discovered before maximum and has been rising over the past few days. The last brightness estimate I saw put it at 14.5 which brings it...
Ken, Wow! What was I thinking of. I do have my 6.3FR mounted about 110mm. from the CCD chip. This would, of course, necessitate the placement of the SA (at...
Hi Jim, The Paton Hawksley spacers are essentially empty Star Analyser filter cells, You can adjust the spacing slightly by unscrewing them and locking them...
Jim, Surplus Shed also have these filter extension tubes or empty filter cells, about 8mm long; I've got a couple I use to hold some polaroid film filters.... ...
The guys in Australia ( where there's less cloud than the UK!!) have been successfully trialing a diaphragm infront of the SA to block out other field stars...
Hi Ken, Interesting. Exactly where is it placed? Is it at a focal plane like a slit is normally used or just in the converging beam? If it is not focussed, I...
Robin, Its actually placed directly infront off, but not touching, the grating, so it effectively blocks all the surrounding stars. I've uploaded a photo of...
Hi Ken, Unfortunately there are some significant limitations and trade offs with this approach. If we omit the grating for the moment then: At a distance d...
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