Presentation Open Access
Giulia De Somma; Marcella Marconi; Salvatore Capozziello; Roberto Molinaro; Ilaria Musella; Vincenzo Ripepi
The Hubble constant tension between the value derived by Riess et al. (2016,2018)
on the basis of Classical Cepheids distances and the Cosmic Microwave Background
results is one of the most debated issues in current astrophysical literature. On the
basis of an updated and extended set of nonlinear convective pulsation models, we
are theoretically investigating the systematic effects on the Cepheid based
extragalactic distance scale and the resulting Hubble constant. The predicted light
curves and pulsation relations for both Galactic and Magellanic Cepheids, based on
these new model sets, are tested on Gaia Data Release 2 (DR2) results.
We find evidence of a Gaia DR2 parallax offset, consistent with independent results
in the literature, but a general good agreement with the distances predicted by our
theoretical pulsation scenario. We discuss the implications of our results and future
perspectives, while waiting for Gaia Data Release 3.
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