Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars
- Autores
- Surlan, B.; Hamann, W. R.; Aret, A.; Kubát, J.; Oskinova, L. M.; Torres, Andrea Fabiana
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Context. Recent studies of O-type stars have demonstrated that discrepant mass-loss rates are obtained when different diagnostic methods are employed. Fitting the unsaturated UV resonance lines (e.g., P v) gives drastically lower values than obtained from the Hα emission. Wind inhomogeneity (so-called “clumping”) may be the main cause of this discrepancy. Aims. In a previous paper, we presented 3D Monte-Carlo calculations for the formation of scattering lines in a clumped stellar wind.In the present paper we select five O-type supergiants (from O4 to O7) and test whether the reported iscrepancies can be resolved this way. Methods. In the first step, the analyses started with simulating the observed spectra with Potsdam Wolf-Rayet (PoWR) non-LTE model atmospheres. The mass-loss rates are adjusted to fit to the observed Hα emission lines best. For the unsaturated UV resonance lines (i.e., P v) we then applied our 3D Monte-Carlo code, which can account for wind clumps of any optical depths (“macroclumping”), a non-void interclump medium, and a velocity dispersion inside the clumps. The ionization stratifications and underlying photospheric spectra were adopted from the PoWR models. The properties of the wind clumps were constrained by fitting the observed resonance line profiles. Results. Our results show that with the mass-loss rates that fit Hα (and other Balmer and He ii lines), the UV resonance lines (especially the unsaturated doublet of P v) can also be reproduced with no problem when macroclumping is taken into account. There is no need to artificially reduce the mass-loss rates or to assume a subsolar phosphorus abundance or an extremely high clumping factor, unlike what was claimed by other authors. These consistent mass-loss rates are lower by a factor of 1.3 to 2.6, compared to the mass-loss rate recipe from Vink et al. Conclusions. Macroclumping resolves the previously reported discrepancy between Hα and P v mass-loss diagnostics.
Fil: Surlan, B.. Astronomický Ústav, Akademie Ved ; República Checa. Matematicki Institut Sanu; Serbia
Fil: Hamann, W. R.. Universität Potsdam. Institut Für Physik Und Astronomie; Alemania
Fil: Aret, A.. Tartu Observatory; Estonia
Fil: Kubát, J.. Astronomický Ústav. Akademie Ved; República Checa
Fil: Oskinova, L. M.. Universität Potsdam. Institut Für Physik Und Astronomie; Alemania
Fil: Torres, Andrea Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina - Materia
-
Winds
Outflows
Mass loss
Early type stars - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/8581
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oai:ri.conicet.gov.ar:11336/8581 |
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Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type starsSurlan, B.Hamann, W. R.Aret, A.Kubát, J.Oskinova, L. M.Torres, Andrea FabianaWindsOutflowsMass lossEarly type starshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. Recent studies of O-type stars have demonstrated that discrepant mass-loss rates are obtained when different diagnostic methods are employed. Fitting the unsaturated UV resonance lines (e.g., P v) gives drastically lower values than obtained from the Hα emission. Wind inhomogeneity (so-called “clumping”) may be the main cause of this discrepancy. Aims. In a previous paper, we presented 3D Monte-Carlo calculations for the formation of scattering lines in a clumped stellar wind.In the present paper we select five O-type supergiants (from O4 to O7) and test whether the reported iscrepancies can be resolved this way. Methods. In the first step, the analyses started with simulating the observed spectra with Potsdam Wolf-Rayet (PoWR) non-LTE model atmospheres. The mass-loss rates are adjusted to fit to the observed Hα emission lines best. For the unsaturated UV resonance lines (i.e., P v) we then applied our 3D Monte-Carlo code, which can account for wind clumps of any optical depths (“macroclumping”), a non-void interclump medium, and a velocity dispersion inside the clumps. The ionization stratifications and underlying photospheric spectra were adopted from the PoWR models. The properties of the wind clumps were constrained by fitting the observed resonance line profiles. Results. Our results show that with the mass-loss rates that fit Hα (and other Balmer and He ii lines), the UV resonance lines (especially the unsaturated doublet of P v) can also be reproduced with no problem when macroclumping is taken into account. There is no need to artificially reduce the mass-loss rates or to assume a subsolar phosphorus abundance or an extremely high clumping factor, unlike what was claimed by other authors. These consistent mass-loss rates are lower by a factor of 1.3 to 2.6, compared to the mass-loss rate recipe from Vink et al. Conclusions. Macroclumping resolves the previously reported discrepancy between Hα and P v mass-loss diagnostics.Fil: Surlan, B.. Astronomický Ústav, Akademie Ved ; República Checa. Matematicki Institut Sanu; SerbiaFil: Hamann, W. R.. Universität Potsdam. Institut Für Physik Und Astronomie; AlemaniaFil: Aret, A.. Tartu Observatory; EstoniaFil: Kubát, J.. Astronomický Ústav. Akademie Ved; República ChecaFil: Oskinova, L. M.. Universität Potsdam. Institut Für Physik Und Astronomie; AlemaniaFil: Torres, Andrea Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; ArgentinaEdp Sciences2013-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/8581Surlan, B.; Hamann, W. R.; Aret, A.; Kubát, J.; Oskinova, L. M.; et al.; Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars; Edp Sciences; Astronomy And Astrophysics; 559; A130; 11-2013; 1-170004-6361enginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201322390info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2013/11/aa22390-13/aa22390-13.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:25:27Zoai:ri.conicet.gov.ar:11336/8581instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:25:27.643CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars |
title |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars |
spellingShingle |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars Surlan, B. Winds Outflows Mass loss Early type stars |
title_short |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars |
title_full |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars |
title_fullStr |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars |
title_full_unstemmed |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars |
title_sort |
Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars |
dc.creator.none.fl_str_mv |
Surlan, B. Hamann, W. R. Aret, A. Kubát, J. Oskinova, L. M. Torres, Andrea Fabiana |
author |
Surlan, B. |
author_facet |
Surlan, B. Hamann, W. R. Aret, A. Kubát, J. Oskinova, L. M. Torres, Andrea Fabiana |
author_role |
author |
author2 |
Hamann, W. R. Aret, A. Kubát, J. Oskinova, L. M. Torres, Andrea Fabiana |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
Winds Outflows Mass loss Early type stars |
topic |
Winds Outflows Mass loss Early type stars |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Context. Recent studies of O-type stars have demonstrated that discrepant mass-loss rates are obtained when different diagnostic methods are employed. Fitting the unsaturated UV resonance lines (e.g., P v) gives drastically lower values than obtained from the Hα emission. Wind inhomogeneity (so-called “clumping”) may be the main cause of this discrepancy. Aims. In a previous paper, we presented 3D Monte-Carlo calculations for the formation of scattering lines in a clumped stellar wind.In the present paper we select five O-type supergiants (from O4 to O7) and test whether the reported iscrepancies can be resolved this way. Methods. In the first step, the analyses started with simulating the observed spectra with Potsdam Wolf-Rayet (PoWR) non-LTE model atmospheres. The mass-loss rates are adjusted to fit to the observed Hα emission lines best. For the unsaturated UV resonance lines (i.e., P v) we then applied our 3D Monte-Carlo code, which can account for wind clumps of any optical depths (“macroclumping”), a non-void interclump medium, and a velocity dispersion inside the clumps. The ionization stratifications and underlying photospheric spectra were adopted from the PoWR models. The properties of the wind clumps were constrained by fitting the observed resonance line profiles. Results. Our results show that with the mass-loss rates that fit Hα (and other Balmer and He ii lines), the UV resonance lines (especially the unsaturated doublet of P v) can also be reproduced with no problem when macroclumping is taken into account. There is no need to artificially reduce the mass-loss rates or to assume a subsolar phosphorus abundance or an extremely high clumping factor, unlike what was claimed by other authors. These consistent mass-loss rates are lower by a factor of 1.3 to 2.6, compared to the mass-loss rate recipe from Vink et al. Conclusions. Macroclumping resolves the previously reported discrepancy between Hα and P v mass-loss diagnostics. Fil: Surlan, B.. Astronomický Ústav, Akademie Ved ; República Checa. Matematicki Institut Sanu; Serbia Fil: Hamann, W. R.. Universität Potsdam. Institut Für Physik Und Astronomie; Alemania Fil: Aret, A.. Tartu Observatory; Estonia Fil: Kubát, J.. Astronomický Ústav. Akademie Ved; República Checa Fil: Oskinova, L. M.. Universität Potsdam. Institut Für Physik Und Astronomie; Alemania Fil: Torres, Andrea Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina |
description |
Context. Recent studies of O-type stars have demonstrated that discrepant mass-loss rates are obtained when different diagnostic methods are employed. Fitting the unsaturated UV resonance lines (e.g., P v) gives drastically lower values than obtained from the Hα emission. Wind inhomogeneity (so-called “clumping”) may be the main cause of this discrepancy. Aims. In a previous paper, we presented 3D Monte-Carlo calculations for the formation of scattering lines in a clumped stellar wind.In the present paper we select five O-type supergiants (from O4 to O7) and test whether the reported iscrepancies can be resolved this way. Methods. In the first step, the analyses started with simulating the observed spectra with Potsdam Wolf-Rayet (PoWR) non-LTE model atmospheres. The mass-loss rates are adjusted to fit to the observed Hα emission lines best. For the unsaturated UV resonance lines (i.e., P v) we then applied our 3D Monte-Carlo code, which can account for wind clumps of any optical depths (“macroclumping”), a non-void interclump medium, and a velocity dispersion inside the clumps. The ionization stratifications and underlying photospheric spectra were adopted from the PoWR models. The properties of the wind clumps were constrained by fitting the observed resonance line profiles. Results. Our results show that with the mass-loss rates that fit Hα (and other Balmer and He ii lines), the UV resonance lines (especially the unsaturated doublet of P v) can also be reproduced with no problem when macroclumping is taken into account. There is no need to artificially reduce the mass-loss rates or to assume a subsolar phosphorus abundance or an extremely high clumping factor, unlike what was claimed by other authors. These consistent mass-loss rates are lower by a factor of 1.3 to 2.6, compared to the mass-loss rate recipe from Vink et al. Conclusions. Macroclumping resolves the previously reported discrepancy between Hα and P v mass-loss diagnostics. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-11 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/8581 Surlan, B.; Hamann, W. R.; Aret, A.; Kubát, J.; Oskinova, L. M.; et al.; Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars; Edp Sciences; Astronomy And Astrophysics; 559; A130; 11-2013; 1-17 0004-6361 |
url |
http://hdl.handle.net/11336/8581 |
identifier_str_mv |
Surlan, B.; Hamann, W. R.; Aret, A.; Kubát, J.; Oskinova, L. M.; et al.; Macroclumping as solution of the discrepancy between Halpha and P V mass loss diagnostics for O-type stars; Edp Sciences; Astronomy And Astrophysics; 559; A130; 11-2013; 1-17 0004-6361 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201322390 info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2013/11/aa22390-13/aa22390-13.html |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Edp Sciences |
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Edp Sciences |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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13.070432 |