Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.



spectra of Be stars in the TESS field

Recommended Posts

Meanwhile with the LHIRES spectrograph, for the past month I have been following a number of Be stars in the field of the TESS satellite at H alpha and He6678A at a resolving power of R=5500 contributing to a Pro Am study trying to correlate star activity with disc formation.  Although there have not been too many clear nights they only take 30min-1 hour each so it is possible to knock off half a dozen in an evening. The graphic shows the results for selection of different Be stars at H alpha.  The one in red currently has no circumstellar disc so just shows the normal absorption line of a B star. Where a disc is present the emission from the disc is superimposed on the absorption and if the disc is strong enough this completely dominates.  Whether the emission is single or double peaked depends on the orientation of the rotating disc relative to us.  When viewed pole on there is no Doppler broadening from the rotation so we just see a single narrow line. When viewed side on we see two peaks from the two sides of the disc rotating towards and away from us.



Edited by robin_astro
  • Like 1

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.