X-Ray Spectral Characterization of the Young Cygnus OB2 Population

Autores
Flaccomio, E.; Albacete Colombo, Juan Facundo; Drake, J. J.; Guarcello, M. G.; Kashyap, V.; Wright, N. J.; Briggs, K.; Ercolano, B.; McCollough, M.; Sciortino, S.
Año de publicación
2023
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We analyze the X-ray spectra of the ∼8000 sources detected in the Cygnus OB2 Chandra Legacy Survey (this focus issue), with the goals of characterizing the coronal plasma of the young low-mass stars in the region and estimating their intrinsic X-ray luminosities. We adopt two different strategies for X-ray sources for which more or less than 20 photons were detected. For the brighter sample we fit the spectra with absorbed isothermal models. In order to limit uncertainties, for most of the fainter Cygnus OB2 members in this sample we constrain the spectral parameters to characteristic ranges defined from the brightest stars. For X-ray sources with <20 net photons we adopt a conversion factor from detected photon flux to intrinsic flux. This was defined, building on the results for the previous sample, as a function of the 20% quantile of the detected photon energy distributions, which we prove to also correlate well with extinction. We then use the X-ray extinction from the spectral fits to constrain the ratio between optical and X-ray extinction toward Cyg OB2, finding it consistent with standard “Galactic” values, when properly accounting for systematics. Finally, we exploit the large number of sources to constrain the average coronal abundances of several elements, through two different ensemble analyses of the X-ray spectra of low-mass Cyg OB2 members. We find the pattern of abundances to be largely consistent with that derived for the young stellar coronae in the Orion Nebula Cluster.
Fil: Flaccomio, E.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
Fil: Albacete Colombo, Juan Facundo. Universidad Nacional de Rio Negro. Sede Atlantica. Departamento de Investigación en Ciencias Exactas, Naturales y de Ingenieria; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; Argentina
Fil: Drake, J. J.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Guarcello, M. G.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
Fil: Kashyap, V.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Wright, N. J.. Keele University.; Reino Unido
Fil: Briggs, K.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Ercolano, B.. Massachusetts Institute of Technology; Estados Unidos
Fil: McCollough, M.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Sciortino, S.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
Materia
Stellar activity
Stellar coronae
pre main sequence stars
T Tauri stars
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/232316
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/232316
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling X-Ray Spectral Characterization of the Young Cygnus OB2 PopulationFlaccomio, E.Albacete Colombo, Juan FacundoDrake, J. J.Guarcello, M. G.Kashyap, V.Wright, N. J.Briggs, K.Ercolano, B.McCollough, M.Sciortino, S.Stellar activityStellar coronaepre main sequence starsT Tauri starshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We analyze the X-ray spectra of the ∼8000 sources detected in the Cygnus OB2 Chandra Legacy Survey (this focus issue), with the goals of characterizing the coronal plasma of the young low-mass stars in the region and estimating their intrinsic X-ray luminosities. We adopt two different strategies for X-ray sources for which more or less than 20 photons were detected. For the brighter sample we fit the spectra with absorbed isothermal models. In order to limit uncertainties, for most of the fainter Cygnus OB2 members in this sample we constrain the spectral parameters to characteristic ranges defined from the brightest stars. For X-ray sources with <20 net photons we adopt a conversion factor from detected photon flux to intrinsic flux. This was defined, building on the results for the previous sample, as a function of the 20% quantile of the detected photon energy distributions, which we prove to also correlate well with extinction. We then use the X-ray extinction from the spectral fits to constrain the ratio between optical and X-ray extinction toward Cyg OB2, finding it consistent with standard “Galactic” values, when properly accounting for systematics. Finally, we exploit the large number of sources to constrain the average coronal abundances of several elements, through two different ensemble analyses of the X-ray spectra of low-mass Cyg OB2 members. We find the pattern of abundances to be largely consistent with that derived for the young stellar coronae in the Orion Nebula Cluster.Fil: Flaccomio, E.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; ItaliaFil: Albacete Colombo, Juan Facundo. Universidad Nacional de Rio Negro. Sede Atlantica. Departamento de Investigación en Ciencias Exactas, Naturales y de Ingenieria; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; ArgentinaFil: Drake, J. J.. Harvard-Smithsonian Center for Astrophysics; Estados UnidosFil: Guarcello, M. G.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; ItaliaFil: Kashyap, V.. Harvard-Smithsonian Center for Astrophysics; Estados UnidosFil: Wright, N. J.. Keele University.; Reino UnidoFil: Briggs, K.. Harvard-Smithsonian Center for Astrophysics; Estados UnidosFil: Ercolano, B.. Massachusetts Institute of Technology; Estados UnidosFil: McCollough, M.. Harvard-Smithsonian Center for Astrophysics; Estados UnidosFil: Sciortino, S.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; ItaliaIOP Publishing2023-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/232316Flaccomio, E.; Albacete Colombo, Juan Facundo; Drake, J. J.; Guarcello, M. G.; Kashyap, V.; et al.; X-Ray Spectral Characterization of the Young Cygnus OB2 Population; IOP Publishing; Astrophysical Journal Supplement Series; 269; 1; 10-2023; 1-190067-0049CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://doi.org/10.3847/1538-4365/acdd66info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4365/acdd66info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:18:55Zoai:ri.conicet.gov.ar:11336/232316instacron: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 10:18:55.297CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv X-Ray Spectral Characterization of the Young Cygnus OB2 Population
title X-Ray Spectral Characterization of the Young Cygnus OB2 Population
spellingShingle X-Ray Spectral Characterization of the Young Cygnus OB2 Population
Flaccomio, E.
Stellar activity
Stellar coronae
pre main sequence stars
T Tauri stars
title_short X-Ray Spectral Characterization of the Young Cygnus OB2 Population
title_full X-Ray Spectral Characterization of the Young Cygnus OB2 Population
title_fullStr X-Ray Spectral Characterization of the Young Cygnus OB2 Population
title_full_unstemmed X-Ray Spectral Characterization of the Young Cygnus OB2 Population
title_sort X-Ray Spectral Characterization of the Young Cygnus OB2 Population
dc.creator.none.fl_str_mv Flaccomio, E.
Albacete Colombo, Juan Facundo
Drake, J. J.
Guarcello, M. G.
Kashyap, V.
Wright, N. J.
Briggs, K.
Ercolano, B.
McCollough, M.
Sciortino, S.
author Flaccomio, E.
author_facet Flaccomio, E.
Albacete Colombo, Juan Facundo
Drake, J. J.
Guarcello, M. G.
Kashyap, V.
Wright, N. J.
Briggs, K.
Ercolano, B.
McCollough, M.
Sciortino, S.
author_role author
author2 Albacete Colombo, Juan Facundo
Drake, J. J.
Guarcello, M. G.
Kashyap, V.
Wright, N. J.
Briggs, K.
Ercolano, B.
McCollough, M.
Sciortino, S.
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Stellar activity
Stellar coronae
pre main sequence stars
T Tauri stars
topic Stellar activity
Stellar coronae
pre main sequence stars
T Tauri 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 We analyze the X-ray spectra of the ∼8000 sources detected in the Cygnus OB2 Chandra Legacy Survey (this focus issue), with the goals of characterizing the coronal plasma of the young low-mass stars in the region and estimating their intrinsic X-ray luminosities. We adopt two different strategies for X-ray sources for which more or less than 20 photons were detected. For the brighter sample we fit the spectra with absorbed isothermal models. In order to limit uncertainties, for most of the fainter Cygnus OB2 members in this sample we constrain the spectral parameters to characteristic ranges defined from the brightest stars. For X-ray sources with <20 net photons we adopt a conversion factor from detected photon flux to intrinsic flux. This was defined, building on the results for the previous sample, as a function of the 20% quantile of the detected photon energy distributions, which we prove to also correlate well with extinction. We then use the X-ray extinction from the spectral fits to constrain the ratio between optical and X-ray extinction toward Cyg OB2, finding it consistent with standard “Galactic” values, when properly accounting for systematics. Finally, we exploit the large number of sources to constrain the average coronal abundances of several elements, through two different ensemble analyses of the X-ray spectra of low-mass Cyg OB2 members. We find the pattern of abundances to be largely consistent with that derived for the young stellar coronae in the Orion Nebula Cluster.
Fil: Flaccomio, E.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
Fil: Albacete Colombo, Juan Facundo. Universidad Nacional de Rio Negro. Sede Atlantica. Departamento de Investigación en Ciencias Exactas, Naturales y de Ingenieria; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia; Argentina
Fil: Drake, J. J.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Guarcello, M. G.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
Fil: Kashyap, V.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Wright, N. J.. Keele University.; Reino Unido
Fil: Briggs, K.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Ercolano, B.. Massachusetts Institute of Technology; Estados Unidos
Fil: McCollough, M.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Sciortino, S.. Istituto Nazionale di Astrofísica. Osservatorio Astronómico di Palermo; Italia
description We analyze the X-ray spectra of the ∼8000 sources detected in the Cygnus OB2 Chandra Legacy Survey (this focus issue), with the goals of characterizing the coronal plasma of the young low-mass stars in the region and estimating their intrinsic X-ray luminosities. We adopt two different strategies for X-ray sources for which more or less than 20 photons were detected. For the brighter sample we fit the spectra with absorbed isothermal models. In order to limit uncertainties, for most of the fainter Cygnus OB2 members in this sample we constrain the spectral parameters to characteristic ranges defined from the brightest stars. For X-ray sources with <20 net photons we adopt a conversion factor from detected photon flux to intrinsic flux. This was defined, building on the results for the previous sample, as a function of the 20% quantile of the detected photon energy distributions, which we prove to also correlate well with extinction. We then use the X-ray extinction from the spectral fits to constrain the ratio between optical and X-ray extinction toward Cyg OB2, finding it consistent with standard “Galactic” values, when properly accounting for systematics. Finally, we exploit the large number of sources to constrain the average coronal abundances of several elements, through two different ensemble analyses of the X-ray spectra of low-mass Cyg OB2 members. We find the pattern of abundances to be largely consistent with that derived for the young stellar coronae in the Orion Nebula Cluster.
publishDate 2023
dc.date.none.fl_str_mv 2023-10
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/11336/232316
Flaccomio, E.; Albacete Colombo, Juan Facundo; Drake, J. J.; Guarcello, M. G.; Kashyap, V.; et al.; X-Ray Spectral Characterization of the Young Cygnus OB2 Population; IOP Publishing; Astrophysical Journal Supplement Series; 269; 1; 10-2023; 1-19
0067-0049
CONICET Digital
CONICET
url http://hdl.handle.net/11336/232316
identifier_str_mv Flaccomio, E.; Albacete Colombo, Juan Facundo; Drake, J. J.; Guarcello, M. G.; Kashyap, V.; et al.; X-Ray Spectral Characterization of the Young Cygnus OB2 Population; IOP Publishing; Astrophysical Journal Supplement Series; 269; 1; 10-2023; 1-19
0067-0049
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://doi.org/10.3847/1538-4365/acdd66
info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4365/acdd66
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 IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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