Temperature dependent convective parameters for RRc 1D-models

TL;DR

This study calibrates temperature-dependent convective parameters in 1D models of RRc and RR Lyrae stars, highlighting parameter sensitivities and correlations, to improve the physical realism of stellar pulsation simulations.

Contribution

It extends previous calibration efforts to RRc stars, analyzing how convective parameters vary with temperature and affect pulsation properties.

Findings

Correlations among convective parameters are present in RRc stars.

High-temperature RRc stars are highly sensitive to parameter choices.

Parameter sets influence pulsation properties significantly.

Abstract

Nonlinear pulsation modeling of classical variable stars is among the first topics which were developed at the beginning of the computational era. Various developments were made, and many questions were answered in the past 60 years, and the models became more complex, describing the genuinely 3D convection in a single dimension. Despite its successes, the recent public availability of the MESA Radial Stellar Pulsations (MESA RSP) module and the emerging results from multidimensional codes made clear that the 8 free convective parameters, unique to these models, together with the underlying physical models need calibration. This could be done by comparing them against multi-dimensional codes, but before that, it is important to scrutinize the free parameters of the 1D codes using observations. This is a follow-up work of our previous calibration on the convective parameters of the Budapest-Florida and MESA RSP pulsation codes for RRab stars. In this paper, we extend the previous calibration to the RRc stars and the RR Lyrae stars in general. We found that correlations of some of the parameters are present in RRc stars as well but have a different nature, while high-temperature RRc stars' pulsation properties are very sensitive to the chosen parameter sets.