British Astronomical Association
Supporting amateur astronomers since 1890

BAA Images Kevin Gurney

Observation by Kevin Gurney: Dynamics of Beta Lyr

Uploaded by

Kevin Gurney


Kevin Gurney


2018 Jun 27 - 23:13


2018 Aug 02 - 13:41

  • Altair Astro 10in RC truss tube
  • LHires 2400l/mm
  • Atik 460EX
  • MESU200 mount
  • Prism, Demetra, Isis, BASS

West Sheffield

Target name

Beta Lyr


Dynamics of Beta Lyr

About this image

Some results from my recently acquired Lhires spectrograph. I was keen to take advantage of the recent spate of decent weather (June 2018) and see if I could capture some line profile variation observable over a few days.

The plot shows an animation of four observations of Halpha in Beta Lyr, taken over the nights of 26-30 June. I have used the period of 12.9 days (AAVSO) to compute a phase for each plot and have arbitrarily started with 0 on the 26th. The spectra are all divided by the continuum (rectified)  and filtered with a Guassian. The colour coding uses 'darker-to-lighter' to imply temporal progression (I had tried to upload an animation in gif, but this doesent appear to work...).

There is a clear change in going from phase 0 to 0.15, and smaller changes (but with feature trends) in the susbequent three spectra.

I have a couple of other observations which occur in a susbequent period of variability and, when phase plotted, confirm the general fetures shown here. All spectra are available in the BAA spectroscopy database.

Files associated with this observation
Like this image
Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of work by third parties is expressly forbidden without the consent of the copyright holder. By submitting images to this online gallery, you grant the BAA permission to reproduce them in any of our publications.