British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

Home Forums Spectroscopy
Terms of use

Lhires results

14 posts / 0 new
Last post
Alun_H's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 08:04
Lhires results

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

        Regards

          Alun

    

  

Andy Wilson's picture
Offline
Last seen: 1 day 22 hours ago
Joined: 29/03/2014 - 16:05
Lhires results

Hi Alun,

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.

Cheers,

Andy

Alun_H's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 08:04
Lhires results

Hi Andy,

   Thank you

    Really got to start taking flats and darks,got no excuses now that the system to capture them is built into the Lhires :)

      Regards

         Alun

           

 

 

daliahmaus's picture
Offline
Last seen: 30 min 46 sec ago
Joined: 30/03/2017 - 16:07
Spectra of 28 Tau

Hi Alun,
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?

Best wishes,
Ernst

Alun_H's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 08:04
28 Tau spectra

Hi Ernst,

      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?

      Regards

         Alun

daliahmaus's picture
Offline
Last seen: 30 min 46 sec ago
Joined: 30/03/2017 - 16:07
28 Tau spectra

Hi Alun,

a 1D profile would be fine.

Ernst

Alun_H's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 08:04
Email sent

Hi Ernst,

    Have sent the 1D profiles to your email address :)

       Thank you 

       Regards

        Alun

daliahmaus's picture
Offline
Last seen: 30 min 46 sec ago
Joined: 30/03/2017 - 16:07
Evaluation of the 28 Tau spectrum (2400 L/mm)

Hi Alun,
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:
http://astrospectroscopy.de/media/files/Periastron_-28-Tau_englisch.pdf

Ernst

Alun_H's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 08:04
Thank You

Hi Ernst,

    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.

  Regards

      Alun

jack martin's picture
Offline
Last seen: 1 day 21 hours ago
Joined: 20/01/2017 - 12:41
Alun,

Alun,

Welcome aboard, nice results.

I use a modified Lhires III too, and have all the gratings.

Regards,

Jack

Essex UK

Alun_H's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 08:04
Jack

 Hi Jack,

     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! :)

     Regards

        Alun

Paul Luckas's picture
Offline
Last seen: 1 week 5 days ago
Joined: 16/11/2016 - 04:32
Lhires III

Hi Alun,

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. :-)

Paul

Alun_H's picture
Offline
Last seen: 1 week 1 day ago
Joined: 05/03/2014 - 08:04
No golfing

Hi Paul,

     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! :))

    Regards

      Alun

   

jack martin's picture
Offline
Last seen: 1 day 21 hours ago
Joined: 20/01/2017 - 12:41
Alun,

Alun,

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.

Regards,

Jack

Essex UK