Relatore
Descrizione
Classical Cepheids and RR Lyrae stars represent fundamental laboratories for testing stellar evolution and pulsation theories. Cepheids are young, intermediate-mass stars and primary standard candles for the extragalactic distance scale, while RR Lyrae stars are low-mass objects tracing old stellar populations. Both classes are characterized by radial pulsations, producing periodic variations in luminosity, effective temperature, and radial velocity.
In this contribution, we present results obtained by comparing predictions from non-linear convective pulsation models with multi-epoch photometric and radial velocity data, primarily from the Gaia mission, showing that the models accurately reproduce the observed morphology of light and radial velocity curves. Our model-fitting approach enables a precise determination of their intrinsic structural parameters, including mass, effective temperature, and luminosity.
For both Classical Cepheids and RR Lyrae stars, the derived parameters provide individual distance estimates, offering an independent check of Gaia parallaxes, and constrain their internal structure and convective efficiency. For Classical Cepheids, the results also place constraints on the mass–luminosity relation.
| Sessione | Oggetti variabili e transienti in astrofisica |
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