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RR Lyr - 2019.07.15

PostPosted: Mon Jul 15, 2019 11:09 am
by etienne bertrand
Chouette observation de l'├ętoile RR Lyr :
Image

Re: RR Lyr - 2019.07.15

PostPosted: Tue Jul 16, 2019 4:59 am
by Hamish Barker
what is the time step for these spectra?

Re: RR Lyr - 2019.07.15

PostPosted: Tue Jul 16, 2019 3:18 pm
by Benjamin Mauclaire
Hello Hamish,

Pulsating stars such as RR Lyr have rapid evolution during their pulsation cycle.
As RR Lyr pulsating period is ~13h, time series is needed to study it, ie adding spectra must not be done.
Etienne's spectra exposure is 600s, as anoted in the animation's title.
RR Lyr maximum duration is about 30 min.
Maximum's date is needed to study astmosphere's dynamics and Blazhko effect.

In our last A&A paper, we've described a "typical" pulsation cycle:
https://ui.adsabs.harvard.edu/abs/2019A%26A...623A.109G/abstract
But variations from cycle to cycle isn't tretated there. That's why observations are needed.

Benji