18 October 2017 at 12:08 am #573866
Finally took the plunge to treat myself to a new Lhires III back in September along with a 1200l/mm grating to accompany the standard 2400l/mm grating to use on my C9.25. Below are a few results I have acquired of late,first few nights I used the 1200 grating with the 19um slit to get accustomed to the unit,using an SX Lodestar to guide and Atik 314L+ for capture. A couple of nights back I used the 2400 grating and 35um slit,thin cloud hanging around so used wide slit for max throughput. All spectra are single images,calibrated in BASS software using the Lhires internal neon lamp,no instrument response correction nor darks/flats,any hot pixels were removed using AstroArt 5.
Thank you for looking
Attachments:18 October 2017 at 8:49 am #578644Mr Andrew Jonathan WilsonKeymaster
That is a nice set of results showing different H-alpha profiles.
While Vega has a very simple spectrum, I do like it as it is such a great illustration of the luminosity class, which in the case of Vega is a V for dwarf. As the star has a smaller radius, so the surface pressure is higher, leading to pressure broadening of the spectral lines.
Once you get used to doing darks and flats then you will find them a doddle. Particularly with the Lhires III inbuilt flat lamp.
Andy18 October 2017 at 9:20 am #578645
I am interested in your both spectra of 28 Tau for the ARAS long-term monitoring of the radial velocity, Halpha V/R and Halpha EW.
Would you be so friendly to send me your fits files?
Ernst18 October 2017 at 11:24 am #578647
Really got to start taking flats and darks,got no excuses now that the system to capture them is built into the Lhires 🙂
Alun18 October 2017 at 11:46 am #578648
Would be more than happy to pass on to you my 28 Tau files. Do you prefer the raw fits file or a 1D profile?
Alun18 October 2017 at 8:53 pm #578649
a 1D profile would be fine.
Ernst18 October 2017 at 9:35 pm #578650
Have sent the 1D profiles to your email address 🙂
Alun20 October 2017 at 3:09 pm #578652
here comes the evaluation of your 2400 L/mm spectrum.
The ARAS monitoring, covers the radial velocity, äquivalent width and the V/R ratio of the Halpha emission.
As you can see, all values of your spectrum fits perfect in the current monitorings. It would be great, when you could continue your observation of that star.
If you are interested in results gotten by the ARAS community in the past, I recommend the study of the IBVS paper at:
Ernst20 October 2017 at 3:29 pm #578653
Thank you for sharing the results,this has given me the confidence that I am doing something right although I still have a long way to go regarding the learning curve involved in this subject 🙂 As soon as the weather improves here I will keep monitoring 28 Tau amongst other targets.
Alun21 October 2017 at 6:43 am #578654Jack MartinParticipant
Welcome aboard, nice results.
I use a modified Lhires III too, and have all the gratings.
Essex UK21 October 2017 at 12:54 pm #578655
Thank you 🙂
After my attempts at DIY spectroscopes (and failing) I decided enough was enough and took the plunge on the Lhires III,not exactly cheap,but then what is in this hobby of ours! 🙂
Alun22 October 2017 at 7:52 am #578660Paul LuckasParticipant
I often note to others that I have friends who spend more on golf than I do on astronomy, so unless you’re doing spectroscopy and playing golf you have nothing to worry about.
Great spectra too. 🙂
Paul23 October 2017 at 10:05 am #578661
Thank you 🙂
No I don’t play golf,but I do tend to spend on astro kit,12 telescopes and more accessories than the average astro shop! :))
Alun29 October 2017 at 12:13 pm #578692Jack MartinParticipant
Its certainly not a cheap hobby but if you want to do scientifically useful work its worth the expense and the rewards.
I have been monitoring vv cep since 2015-08-26 now have over 90 nights of data.
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