Affiliation
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) :
https://www.researchgate.net/publication/1799435_The_RR_Lyrae_Period-Lu…
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.
Thanks.
David
I'm tracking this in https://github.com/AAVSO/VStar/issues/86 now. Input still welcome.
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 LCplot.pl, 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 ahowe@frii.com
Rodney
Check that:
http://physique.unice.fr/sem6/2013-2014/PagesWeb/PT/Lyrae/calculs.html
I know, it's in french but the formula is there.
JBD
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 http://aspbooks.org/publications/529/033.pdf.
Hi David, did you or anyone find any appropriate PLR for W Virginis (CWA)?
https://ui.adsabs.harvard.edu/abs/2003AJ....126.1381P/abstract (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 https://www.aavso.org/vsx/index.php?view=detail.top&oid=365549
The ASA-SN catalog for this star (https://asas-sn.osu.edu/variables/b6fab4cc-5f1b-57b4-b5eb-75355d20a707) 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
thanks
Les
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:
https://ui.adsabs.harvard.edu/abs/2022ApJ...925..114C/abstract
...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.
\Brian
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:
https://arxiv.org/abs/2307.03033
Primary Period-Luminosity-Relation Calibrators in the Milky Way: Cepheids and RR Lyrae Physical basis, Calibration, and Applications
\Brian