Period Luminosity Relation for RR Lyr

Astronomical Society of South Australia (ASSAU)
Sun, 10/04/2020 - 02:28

Hi all

At some point I want to extend the Leavitt's Law plugin in VStar to allow for distance to variable types other DCEP to be determined.

Here's a paper for RR Lyr period luminosity relations from 2004 (Catelan et al) :…

The authors provide I,J,H,K,V band specific PL relations involving P (period) and Z (metalicity).

Are there other papers anyone would suggest? I've seen a few relavant papers but I seek guidance from others more knowledgable in this area.

I'm also interested in papers pointing to period luminosity relations for variable types other than Type I (DCEP) and RR Lyr, e.g. Mira, Type II Cepheids.



P/L for LPV

Hi David,

I've been working on Period - Luminosity relation for red-giant and LPV stars. I do this by taking weekly averages of .Vis entries going way back.  I pull data using Hernan's, then clean the data with a C++ routine and then use R routines to create weekly period estimates, and graphics.  

Not sure how useful it would be for VStar, though. Perhaps email me if you're interested



American Association of Variable Star Observers (AAVSO)
Formula for the RR Lyr distance

Check that:

I know, it's in french but the formula is there.


American Association of Variable Star Observers (AAVSO)
Gaia results

You likely have already seen that results from Gaia are pinning down these calibrations better than before. A nice review of some early Gaia results for RR Lyrae variables is given by Lub in


American Association of Variable Star Observers (AAVSO)
P-L for W Virginis

Hi David, did you or anyone find any appropriate PLR for W Virginis (CWA)? (Pritzl et al 2003) contains a couple of references.

Fernie, JD (1964) also contains P-L for W Virginis

I'm searching for a V-band P-L for a target

The ASA-SN catalog for this star ( states distance ~7837pc but doesn't state the P-L used to calculate this.  My observations and calculations suggest ~50kpc to 70kpc depending on P-L



American Association of Variable Star Observers (AAVSO)
P-L relation for RR Lyrae

     I'm not sure that a simple P-L relation obtains because of the complicated underlying physics.  The 2004 Catelan paper is a good place to start, however.  Much more recently, Merieme Chadid has been leading a group using data from an Antarctic station to reveal gravity-mode pulsation in RR Lyraes:

...which struck me as one of these ground-breaking papers that hasn't been duly recognized.  She has been working with George Preston and Chris Sneden on detailed spectroscopic analysis as well.


American Association of Variable Star Observers (AAVSO)
P-L relations

     A bit more on this in case there is still interest:  evidently there's been an IAU symposium on this topic, from which several review papers have been appearing on astro-ph.  Another such appeared on last night's listing from Martin Groenewegen, an expert on this topic:

Primary Period-Luminosity-Relation Calibrators in the Milky Way: Cepheids and RR Lyrae Physical basis, Calibration, and Applications