Pulsating RR Lyrae

[robin_astro]

This graphic shows the small  shifts in wavelength and changes in intensity of spectrum lines as RR Lyrae pulsates during its 13.6 hour cycle. The Doppler velocity measurements have been integrated to show the changing size of the star and the changing intensity of the lines tracks changes in temperature. These are compared with the changing brightness.   (Unlike what some incorrect graphics  around on the internet show, maximum and minimum brightness do not correspond to maximum and minimum diameter) 

More detailed notes on my BAA page here

https://britastro.org/observations/observation.php?id=20220907_220530_9acdefe378f91ae9 

Cheers

Robin

 

 

Edited September 11, 2022 by robin_astro
clarity

[andrew s]

Excellent work Robin

Regards Andrew