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| Paper: |
Omega Centauri: a Laboratory for All RR Lyrae |
| Volume: |
529, RR Lyrae/Cepheid 2019: Frontiers of Classical Pulsators |
| Page: |
172 |
| Authors: |
Braga, V. F.; Bono, G.; Stetson, P. B.; Dall'Ora, M.; Marconi, M.; Fabrizio, M.; Marinoni, S.; Marrese, P. M.; Marengo, M.; Neeley, J.; Ferraro, I.; Fiorentino, G.; Iannicola, G. |
| Abstract: |
We have collected thousands of optical (UBVRI) and Near-Infrared (JHKs)
images of ω Cen and derived the pulsation properties of
its RR Lyrae. We found a clear difference between their
period distribution and that of RRLs in dwarf Spheroidal galaxies.
We also detected a peculiar behavior of their optical-to-NIR amplitude
ratios, similar to the behavior of Classical Cepheids.
By adopting the Period-Luminosity relations of RRLs,
we estimated the distance modulus of the cluster, which
is crucial for the calibration of the extragalactic
distance scale. Finally, we used the light curves of the RRLs of ω Cen, M4
and a dozen of field RRLs, to build new NIR light curve templates.
We adopted these templates to estimate mean magnitudes of ∼1000
field RRLs for which we have retrieved multiepoch 2MASS photometry. |
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