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dc.contributor.author
Gormaz Matamala, A. C.
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Curé, M.
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Lobel, A.
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Panei, Jorge Alejandro
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Cuadra, J.
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Araya, I.
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Arcos, C.
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Figueroa Tapia, F.
dc.date.available
2023-09-08T11:36:52Z
dc.date.issued
2022-05
dc.identifier.citation
Gormaz Matamala, A. C.; Curé, M.; Lobel, A.; Panei, Jorge Alejandro; Cuadra, J.; et al.; New self-consistent wind parameters to fit optical spectra of O-type stars observed with the HERMES spectrograph; EDP Sciences; Astronomy and Astrophysics; 661; 5-2022; 51-72
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/210872
dc.description.abstract
Aims. We performed a spectral fitting for a set of O-type stars based on self-consistent wind solutions, which provide mass-loss rate and velocity profiles directly derived from the initial stellar parameters. The great advantage of this self-consistent spectral fitting is therefore the reduction of the number of free parameters to be tuned. Methods. Self-consistent values for the line-force parameters (k, α, δ)sc and subsequently for the mass-loss rate, Msc, and terminal velocity, v∞,sc, are provided by the m-CAK prescription introduced in Paper I, which is updated in this work with improvements such as a temperature structure T(r) for the wind that are self-consistently evaluated from the line-acceleration. Synthetic spectra were calculated using the radiative transfer code FASTWIND, replacing the classical β-law for our new calculated velocity profiles v(r) and therefore making clumping the only free parameter for the stellar wind. Results. We found that self-consistent m-CAK solutions provide values for theoretical mass-loss rates of the order of the most recent predictions of other studies. From here, we generate synthetic spectra with self-consistent hydrodynamics to fit and obtain a new set of stellar and wind parameters for our sample of O-type stars (HD 192639, 9 Sge, HD 57682, HD 218915, HD 195592, and HD 210809), whose spectra were taken with the high-resolution echelle spectrograph HERMES (R = 85 000). We find a satisfactory global fit for our observations, with a good accuracy for photospheric He I and He II lines and a quite acceptable fit for H lines. Although this self-consistent spectral analysis is currently constrained in the optical wavelength range alone, this is an important step towards the determination of stellar and wind parameters without using a β-law. Based on the variance of the line-force parameters, we establish that our method is valid for O-type stars with Teff a ¥ 30 kK and log g a ¥ 3.2. Given these results, we expect that the values introduced here are helpful for future studies of the stars constituting this sample, together with the prospect that the m-CAK self-consistent prescription may be extended to numerous studies of massive stars in the future.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
HYDRODYNAMICS
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METHODS: ANALYTICAL
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OUTFLOWS
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STARS: EARLY-TYPE
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STARS: MASS-LOSS
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STARS: WINDS
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TECHNIQUES: SPECTROSCOPIC
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
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dc.title
New self-consistent wind parameters to fit optical spectra of O-type stars observed with the HERMES spectrograph
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
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info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-09-05T18:04:53Z
dc.journal.volume
661
dc.journal.pagination
51-72
dc.journal.pais
Francia
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dc.journal.ciudad
Paris
dc.description.fil
Fil: Gormaz Matamala, A. C.. Universidad de Valparaíso; Chile. Universidad Adolfo Ibañez; Chile
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Fil: Curé, M.. Universidad de Valparaíso; Chile
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Fil: Lobel, A.. Royal Observatory Of Belgium; Bélgica
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Fil: Panei, Jorge Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
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Fil: Cuadra, J.. Universidad Adolfo Ibañez; Chile
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Fil: Araya, I.. Universidad Mayor; Chile
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Fil: Arcos, C.. Universidad de Valparaíso; Chile
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Fil: Figueroa Tapia, F.. Universidad de Valparaíso; Chile
dc.journal.title
Astronomy and Astrophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/202142383
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