Hello I have a few gamma cas spectra now and would like to put them together on one document for comparison. I use rspec but can't work out how to do it, but...
2517
Robin Leadbeater
staranalyser
Jul 15, 2012 6:02 pm
Hi Kate, Not sure how many simultaneous spectra can be plotted in RSpec but certainly VSpec can be used to plot at least several tens of spectra simultaneously...
2518
Rainer
rsbfoto
Jul 15, 2012 7:15 pm
Hi Kate, At the moment the maximum are 2, one as reference and one as profile. As far as I know that feature is on the To Do list of Tom Field ... I asked him...
2519
kate
revandbellman
Jul 15, 2012 8:55 pm
Thank you Rainer and Robin, Will try and see what I can create in vspec or ISIS kate...
2520
Olivier Thizy
olivier.thizy
Jul 15, 2012 10:10 pm
Kate, For this, I would recommand the freeware VisualSpec. Open your profiles and use the menu "Tools"/"Stack & Shift Y". It is fairly straight forward... ...
2521
matted
matted69
Jul 16, 2012 1:06 am
And if you dont want to go through the hassle of learning another program, you can always simply cut and paste the contents of a .dat file into excel and plot...
2522
kate
revandbellman
Jul 17, 2012 7:54 pm
Thanks Olivier. Think I must be confused though as I can't find stack under the tools menu. I'm sure I downloaded the correct program. Kate...
2523
Robin Leadbeater
staranalyser
Jul 17, 2012 9:42 pm
Hi Kate, See the attached screen shot. You only get the relevant menus once you have loaded the spectra. You can just drag and drop them (Note, if you are ...
2524
Olivier Thizy
olivier.thizy
Jul 24, 2012 12:12 pm
Hello, Paolo just published a very nice spectrum of nova Sgr 4. See ARAS forum: http://www.spectro-aras.com/forum/viewtopic.php?f=6&t=383&p=1314#p1313 See also...
2525
kate
revandbellman
Jul 26, 2012 3:34 pm
Hello, Finally got the star analyser working well with my MX9. Last night I imaged Vega and some other A stars as well as arcturus. I know what the A class...
2526
Ken Harrison
ken4optics
Jul 26, 2012 4:08 pm
Kate, Sounds good. Did you upload any images? -- "Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before.... ...
2527
Olivier Thizy
olivier.thizy
Jul 26, 2012 4:26 pm
Kate, Great! If you want, you can compare with a theoritical spectrum of a K1III star (from library). In VisualSpec, first open your calibrated...
2528
kate
revandbellman
Jul 26, 2012 4:26 pm
Sorry, should have added vega and arcturus are in my folder (Kate's album) Kate...
2529
Olivier Thizy
olivier.thizy
Jul 26, 2012 4:35 pm
Kate, Another funny thing to do in low resolution star spectroscopy: measure their photosphere effective temperature. Load your calibrated profile/spectrum in...
2530
kate
revandbellman
Jul 26, 2012 4:46 pm
That sounds quite interesting Olivier. I will have a go at that this evening. I do most of my work in rspec, but am gradually sorting out how to use vspec as...
2531
Robin Leadbeater
staranalyser
Jul 27, 2012 2:56 pm
Hi Kate, Identifying lines in K type stars like Arcturtus at low resolution can be tricky because it is at a temperature where the Hydrogen lines which ...
2532
kate
revandbellman
Jul 28, 2012 10:09 am
Hello Robin, Looking at my data the best part of the information lies from about 4800 onwards, so no Ca lines, but i think I found Mg and Na. There is a lot...
2533
kate
revandbellman
Jul 29, 2012 10:48 am
I have uploaded to my folder an image I took of Kochab last night. I was expecting something like arcturus as it is a K star, but it is much more Messy? Is...
2534
Jeff
hposoft
Jul 29, 2012 6:26 pm
Hi Kate, Those are very interesting line profiles. I am impressed with the sensitivity at the longer wavelengths. What camera are you using and how long did...
2535
kate
revandbellman
Jul 29, 2012 8:07 pm
Hello, I took 5 images at 15 seconds each using an MX9 starlight xpress camera through a mak/cas 5 inch telescope. Kate...
2536
Jeff
hposoft
Jul 29, 2012 9:01 pm
Hi Kate, I checked that camera. It uses a Sony ICX083AL CCD chip. Here is hte spectral response of it. You can see it goes well into the longer wavelengths. ...
2537
Thom Gandet
thom_gandet
Jul 30, 2012 6:20 pm
Hi Kate, Your exposure times look fine. I think your spectra show the real differences between Kochab and Arcturus. Kochab is a redder star than Arcturus. ...
2538
kate
revandbellman
Jul 31, 2012 6:51 pm
Hi Thom, Prior to this image I've done a lot more A type stars, and they all looked fairly similar. I took an image of schedar last night and was surprised how...
2539
Ken Harrison
ken4optics
Aug 1, 2012 11:21 pm
Kate, I'd recommend Kaler's "Stars and their Spectra" as a good introduction..then there's Gray& Corbally "Stellar Classification"; Richard Walker's "Analysis...
2540
kate
revandbellman
Aug 2, 2012 7:43 am
Hi Ken, Amazingly I bought both the Kaler and your newest book recently and they both arrived last week. So I am reading them at the moment. I have had a look...
2541
Nor
norschramm
Aug 6, 2012 7:30 pm
Hi All, Just joined the group because I'm interested in getting my feet wet in Spectroscopy. What I would like to do is get the spectra of bright Supernovae....
2542
Ken Harrison
ken4optics
Aug 6, 2012 9:22 pm
Nor, A couple of comments: The SN8 is a f4 scope and this is a bit fast for a grating..lot's of chromatic coma and loss of resolution. Above f5 is better. Your...
2543
Nor
norschramm
Aug 6, 2012 11:26 pm
HI Ken, Thanks for the info. The pixel size of the SSP camera is 7.8 microns. Thought that probably doesn't matter much. I do have a DSI Color camera which has...
2544
Ken Harrison
ken4optics
Aug 7, 2012 3:26 am
Nor, The Rainbow Optics 200 l/mm is available, and Tom Field sells the SA100. http://www.rspec-astro.com/star-analyser/ I took the pixel size from the Spec...
2545
Nor
norschramm
Aug 7, 2012 6:03 pm
Hi Ken, For what it's worth, I took another look at the manual for the SSP V2 and it states that the pixel size is 7.8 with an array of 3032x2016 using the ...
