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New self-consistent wind parameters to fit optical spectra of O-type stars

Published online by Cambridge University Press:  29 August 2024

Alex Camilo Gormaz-Matamala Open the ORCID record for Alex Camilo Gormaz-Matamala [Opens in a new window]
Alex Camilo Gormaz-Matamala*
Affiliation:
Departamento de Ciencias, Facultad de Artes Liberales, Universidad Adolfo Ibáñez, Av. Padre Hurtado 750, Viña del Mar, Chile Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile 782-0436 Santiago, Chile
*
email: alex.gormaz@uv.cl
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Abstract

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We perform spectral fittings for O-type stars based on self-consistent wind solutions, providing Ṁ and ν(r directly derived from the initial stellar parameters. We introduce our two methods: m-CAK prescription and Lambert-procedure.

The Lambert-procedure allows the calculation of consistent v(r) that reduce the number of free parameters when a spectral fitting using CMFGEN is performed, even without recalculation of the Ṁ. Spectra calculated from our Lambert-solutions show significant differences compared to the initial β-law CMFGEN models. For m-CAK prescription, self-consistent solutions provide values for theoretical Ṁ on the order of the most recent predictions from other studies. Later, we find a global fit with the RT code FASTWIND. This is an important step towards the determination of stellar and wind parameters without using β-law. Our m-CAK prescription is valid for the O-type stars with Teff ≥ 30 kK and log g ≥ 3.2.

We expect that solutions introduced here to be extended to numerous studies about massive stars in future.

Keywords

Early-type starsHydrodynamicsStellar winds
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 190 - 191
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

Gormaz-Matamala, A. C., Curé, M., Lobel, A., Panei, J. A., Cuadra, J., Araya, I., Arcos, C., et al., 2022a, A&A, 661A, 51G Google Scholar
Gormaz-Matamala, A. C., Curé, M., Hillier, D. J., Najarro, F., Kubátová, B., Kubát, J., 2021, ApJ, 920, 64G Google Scholar
Gormaz-Matamala, A. C., Curé, M., Cidale, L. S., Venero, R. O. J., 2019, ApJ, 873, 131G CrossRefGoogle Scholar