Gaia DR3 RR Lyrae (RRab, RRc): Top 1000 Single-Pulsation CMD Loops [RP vs BP-RP] - Animated

Thought some would enjoy this, so here it is. Normalized by period, observed / apparent values.

Animated CMD

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That is both cool and informative!

It is interesting but visually it looks like the whole “cloud” is rotating together. Individual objects are not moving with large amplitudes, so the perception of the whole cloud moving and rotating around some center is not true.

Another phase plane view may reveal something more physical and useful perhaps.

I’m sure I’ve seen various phase-plane plots etc. in the literature. You should do some AI searching and a literature search using Google Scholar at a minimum to find out what has been done.

Jim (DEY)

The very broad red-leaning GAIA passbands mean the animation is basically showing just the temperature changes in the ensemble. To be more interesting and diagnostic you’d want to have a violet passband such as Johnson U or Sloan u, so you pick up a luminosity component that’s somewhat skew to leverage the other two colors. Conrad Sturch was among the first to explore this in the 1960s in:

If anyone wants the ~900 lines of UBV data he published, I have them keyed-in. There is plenty else along these lines as well.

\Brian

There are no other visuals like this. The whole cloud rotating together is an optical illusion. There’s nothing exciting going on here, it’s just a fun toy.

There was a similar single-pulsation animation released in DR2 I believe, but it was similarly simple.

this animation is not corrected for extinction or reddening. and extinction is phase-dependent, it’s not a flat translation–something often overlooked.