I took a low resolution spectrum of this new variable in outburst last night using a Star Analyser grating in a slitless setup. Unfortunately when I came to...
Interesting result Robin - I too recorded the field last night [2006 Nov 1] via colour DSLR [the star is bluish] and lo-res spectrum via Rainbow grating and...
I took another spectrum last night avoiding the other stars this time http://mysite.wanadoo-members.co.uk/astro2/spectra_30.htm No real change just fainter....
This star in outburst is turning out to be something rather unusual http://www.aavso.org/publications/specialnotice/22.shtml It brightened from mag 11.8 to 7.5...
This event is now considered to be a possible gravitational microlensing event (ie something unseen is moving in front of this star and magnifying its...
Hi - this is a general query. I've noticed that my [Rainbow] grating in non-objective eg field spectrograph mode [common to this forum] that the diameter of...
Hi Maurice, I have not noticed the first effect, though I will look out for it now you have mentioned it. I also have some glass in the optics (VC200L) though...
I have added a graph to my files folder showing an estimate of the spectral response of the SA100 grating. (It is based on the measurement of the total...
Thanks Robin - most interesting. The Ha response seems is excellent! Do I assume that as the relative red response is higher than the 'measured' that the...
Hi Maurice, The original graphs were all on different Y scales so you cannot really compare them directly against each other. I just normalised them all at...
Hi all, I recently purchased a Star Analyser and have taken some images. I'm a little confused about what I'm seeing. Here are some lightly processed images...
Hi Mark, Congratulations on your first spectra :-) The part of the spectrum to the right of the red is all in the Infra Red (The red green and blue filters in...
Hi Robin, Thinking about it makes perfect sense - I couldn't for the life of me work out why what I saw in the eyepiece looked different from the CCD image!...
Nice start Mark - well done! Just a minor item to Robin's excellent tutorial. I've found if the colour saturation is too high it also tends to mask the...
Give me some guidance here guys :-) Am I on the right track? Per Robin's suggestion I managed to get a spectrum of Betelgeuse later on this evening. Here's...
Mark, Betelgeuse is not an easy one as there are so many lines... Try a "simplier" star first: "A" class star such as Vega for exemple or Sirius in the Winter...
Hi Mark, Yep that is the right one. :-) As Olivier says, Vega will give you a better calibration which you can use for other observations provided your setup...
Hi Olivier, This is something I have ignored up to now but I need to find out more about. It came up concerning the measurements I made of the possible ...
Hi Jeff, Ah, so that is how air mass is calculated. Thanks for that. Visual Spec can calculate the air mass and this can then be entered to correct the...
Well I tried out the correction in Vspec and it seems to be mulitplying by the factor instead of dividing to me. The flux appears to be higher after...
Hello Robin, The air mass calculation is straight forward. Extinction is another issue. Extinction is indeed wavelength dependent. It is great in the shorter ...
Please ignore the previous post. Of course the flux will be higher as Vspec is correcting a profile which is assumed to have extinction. The effect is greater...
Sorry for the delay I am out of circulation from the 8 of october and accident put me in the hospital from this time a broken leg;in multiple part and a broken...
Hi Jaques, Welcome back and sorry to hear about your accident. It sounds very nasty. I wish you a full and speedy recovery. Best wishes Robin ... side ... ...
Well this star is now back to pre event brightness and I managed to get some more spectra including one a couple of nights ago. They are all essentially...
Has any here had a problem posting their processed jpegs (spectra) to Yahoo? We get a message "unsupported image file" ? So far as anyone knows our files are...
Hi Jerry, Can't say I have noticed a problem. One thought - do they have the file extension .jpg or .jpeg. I have a program which is happy with .jpg but will...
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