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Anomalous Cepheids: Updated Theoretical Period–Luminosity–Color and Period–Wesenheit Relations

Published online by Cambridge University Press:  06 February 2024

Giulia De Somma Open the ORCID record for Giulia De Somma [Opens in a new window] ,
Marcella Marconi ,
Santi Cassisi  and
Roberto Molinaro
Giulia De Somma*
Affiliation:
INAF-Osservatorio astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy Istituto Nazionale di Fisica Nucleare (INFN), Sez. di Napoli, Compl. Univ. di Monte S. Angelo, Edificio G, Via Cinthia, I-80126, Napoli, Italy INAF-Osservatorio Astronomico d’Abruzzo, Via Maggini sn, 64100 Teramo, Italy
Marcella Marconi
Affiliation:
INAF-Osservatorio astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
Santi Cassisi
Affiliation:
INAF-Osservatorio Astronomico d’Abruzzo, Via Maggini sn, 64100 Teramo, Italy Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Pisa, Universitá di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy
Roberto Molinaro
Affiliation:
INAF-Osservatorio astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
*
email: giulia.desomma@inaf.it
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Abstract

In the context of a project aimed to provide an updated theoretical scenario for various classes of radially pulsating stars, we present the first results obtained for anomalous Cepheids. By adopting reliable and updated evolutionary prescriptions concerning the luminosity levels for various core He-burning stellar models with masses suitable for entering the instability strip, we have computed nonlinear convective pulsation models for both fundamental and first-overtone mode anomalous Cepheids by exploring the impact of varying the metal abundance as well as the efficiency of super-adiabatic convection. These numerical simulations have allowed us to retrieve the boundaries of the instability strip and all relevant pulsation properties, namely period, amplitude, bolometric light and radial velocity curves. This theoretical scenario has been transformed into the Gaia photometric system to derive the first theoretical Period–Luminosity–Colour and Period–Wesenheit relations in the Gaia bands.

Keywords

stellar evolutionstellar oscillationsCepheids variable stars
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S376: At the crossroads of astrophysics and cosmology: Period–luminosity relations in the 2020s , December 2022 , pp. 84 - 90
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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