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ISOSCELES: Grid of stellar atmosphere and hydrodynamic models of massive stars. The first results

Published online by Cambridge University Press:  16 August 2023

Ignacio Araya Open the ORCID record for Ignacio Araya [Opens in a new window] ,
Michel Curé Open the ORCID record for Michel Curé [Opens in a new window] ,
Natalia Machuca  and
Catalina Arcos Open the ORCID record for Catalina Arcos [Opens in a new window]
Ignacio Araya
Affiliation:
Vicerrectoría de Investigación, Universidad Mayor, Chile
Michel Curé
Affiliation:
Instituto de Física y Astronomía, Universidad de Valparaíso, Chile
Natalia Machuca
Affiliation:
Instituto de Física y Astronomía, Universidad de Valparaíso, Chile
Catalina Arcos
Affiliation:
Instituto de Física y Astronomía, Universidad de Valparaíso, Chile
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Abstract

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In this work we seek to derive simultaneously the stellar and wind parameters of massive stars, mainly A and B type supergiant stars. Our stellar properties encompass the effective temperature, the surface gravity, the micro-turbulence velocity and, silicon abundance. For wind properties we consider the line–force parameters (α, k and δ) obtained from the standard line-driven wind theory. To model the data we use the radiative transport code Fastwind considering the hydrodynamic solutions derived with the stationary code Hydwind. Then, ISOSCELES, a grid of stellar atmosphere and hydrodynamic models of massive stars is created. Together with the observed spectra and a semi-automatic tool the physical properties from these stars are determined through spectral line fittings. This quantitative spectroscopic analysis provide an estimation about the line–force parameters. In addition, we confirm that the hydrodynamic solutions, called δ-slow solutions, describe quite reliable the radiation line-driven winds of B supergiant stars.

Keywords

stars: early-typestars: mass lossstars: windsoutflowshydrodynamicstechniques: spectroscopic
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 180 - 184
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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