Hα and the Ca II H and K lines as activity proxies for late-type stars

Autores
Cincunegui, Carolina Cecilia; Diaz, Rodrigo Fernando; Mauas, Pablo Jacobo David
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context.The main chromospheric activity indicator is the S index, which is the ratio of the flux in the core of the Ca II H and K lines to the continuum nearby, and is well studied for stars from F to K. Another chromospheric proxy is the Hα line, which is believed to be tightly correlated with the Ca II index. Aims.In this work we characterize both chromospheric activity indicators, the one associated with the H and K Ca II lines and the other with Hα, for the whole range of late type stars, from F to M. Methods.We present periodic medium-resolution echelle observations covering the complete visual range, taken at the CASLEO Argentinean Observatory over 7 years. We use a total of 917 flux-calibrated spectra for 109 stars that range from F6 to M5. We statistically study these two indicators for stars of different activity levels and spectral types. Results.We directly derive the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigate the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar colour, and not the product of similar activity phenomena.
Fil: Cincunegui, Carolina Cecilia. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Materia
STARS: ACTIVITY
STARS: CHROMOSPHERES
STARS: LATE-TYPE
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:11336/20849
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/20849
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Hα and the Ca II H and K lines as activity proxies for late-type starsCincunegui, Carolina CeciliaDiaz, Rodrigo FernandoMauas, Pablo Jacobo DavidSTARS: ACTIVITYSTARS: CHROMOSPHERESSTARS: LATE-TYPEhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context.The main chromospheric activity indicator is the S index, which is the ratio of the flux in the core of the Ca II H and K lines to the continuum nearby, and is well studied for stars from F to K. Another chromospheric proxy is the Hα line, which is believed to be tightly correlated with the Ca II index. Aims.In this work we characterize both chromospheric activity indicators, the one associated with the H and K Ca II lines and the other with Hα, for the whole range of late type stars, from F to M. Methods.We present periodic medium-resolution echelle observations covering the complete visual range, taken at the CASLEO Argentinean Observatory over 7 years. We use a total of 917 flux-calibrated spectra for 109 stars that range from F6 to M5. We statistically study these two indicators for stars of different activity levels and spectral types. Results.We directly derive the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigate the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar colour, and not the product of similar activity phenomena.Fil: Cincunegui, Carolina Cecilia. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaEDP Sciences2007-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/20849Cincunegui, Carolina Cecilia; Diaz, Rodrigo Fernando; Mauas, Pablo Jacobo David; Hα and the Ca II H and K lines as activity proxies for late-type stars; EDP Sciences; Astronomy and Astrophysics; 469; 1; 7-2007; 309-3170004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20066503info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2007/25/aa6503-06/aa6503-06.htmlinfo:eu-repo/semantics/altIdentifier/arxiv/https://arxiv.org/abs/astro-ph/0703511v1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:21:56Zoai:ri.conicet.gov.ar:11336/20849instacron: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 10:21:56.548CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Hα and the Ca II H and K lines as activity proxies for late-type stars
title Hα and the Ca II H and K lines as activity proxies for late-type stars
spellingShingle Hα and the Ca II H and K lines as activity proxies for late-type stars
Cincunegui, Carolina Cecilia
STARS: ACTIVITY
STARS: CHROMOSPHERES
STARS: LATE-TYPE
title_short Hα and the Ca II H and K lines as activity proxies for late-type stars
title_full Hα and the Ca II H and K lines as activity proxies for late-type stars
title_fullStr Hα and the Ca II H and K lines as activity proxies for late-type stars
title_full_unstemmed Hα and the Ca II H and K lines as activity proxies for late-type stars
title_sort Hα and the Ca II H and K lines as activity proxies for late-type stars
dc.creator.none.fl_str_mv Cincunegui, Carolina Cecilia
Diaz, Rodrigo Fernando
Mauas, Pablo Jacobo David
author Cincunegui, Carolina Cecilia
author_facet Cincunegui, Carolina Cecilia
Diaz, Rodrigo Fernando
Mauas, Pablo Jacobo David
author_role author
author2 Diaz, Rodrigo Fernando
Mauas, Pablo Jacobo David
author2_role author
author
dc.subject.none.fl_str_mv STARS: ACTIVITY
STARS: CHROMOSPHERES
STARS: LATE-TYPE
topic STARS: ACTIVITY
STARS: CHROMOSPHERES
STARS: LATE-TYPE
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.The main chromospheric activity indicator is the S index, which is the ratio of the flux in the core of the Ca II H and K lines to the continuum nearby, and is well studied for stars from F to K. Another chromospheric proxy is the Hα line, which is believed to be tightly correlated with the Ca II index. Aims.In this work we characterize both chromospheric activity indicators, the one associated with the H and K Ca II lines and the other with Hα, for the whole range of late type stars, from F to M. Methods.We present periodic medium-resolution echelle observations covering the complete visual range, taken at the CASLEO Argentinean Observatory over 7 years. We use a total of 917 flux-calibrated spectra for 109 stars that range from F6 to M5. We statistically study these two indicators for stars of different activity levels and spectral types. Results.We directly derive the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigate the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar colour, and not the product of similar activity phenomena.
Fil: Cincunegui, Carolina Cecilia. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Diaz, Rodrigo Fernando. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Mauas, Pablo Jacobo David. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
description Context.The main chromospheric activity indicator is the S index, which is the ratio of the flux in the core of the Ca II H and K lines to the continuum nearby, and is well studied for stars from F to K. Another chromospheric proxy is the Hα line, which is believed to be tightly correlated with the Ca II index. Aims.In this work we characterize both chromospheric activity indicators, the one associated with the H and K Ca II lines and the other with Hα, for the whole range of late type stars, from F to M. Methods.We present periodic medium-resolution echelle observations covering the complete visual range, taken at the CASLEO Argentinean Observatory over 7 years. We use a total of 917 flux-calibrated spectra for 109 stars that range from F6 to M5. We statistically study these two indicators for stars of different activity levels and spectral types. Results.We directly derive the conversion factor that translates the known S index to flux in the Ca II cores, and extend its calibration to a wider spectral range. We investigate the relation between the activity measurements in the calcium and hydrogen lines, and found that the usual correlation observed is the product of the dependence of each flux on stellar colour, and not the product of similar activity phenomena.
publishDate 2007
dc.date.none.fl_str_mv 2007-07
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/11336/20849
Cincunegui, Carolina Cecilia; Diaz, Rodrigo Fernando; Mauas, Pablo Jacobo David; Hα and the Ca II H and K lines as activity proxies for late-type stars; EDP Sciences; Astronomy and Astrophysics; 469; 1; 7-2007; 309-317
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/20849
identifier_str_mv Cincunegui, Carolina Cecilia; Diaz, Rodrigo Fernando; Mauas, Pablo Jacobo David; Hα and the Ca II H and K lines as activity proxies for late-type stars; EDP Sciences; Astronomy and Astrophysics; 469; 1; 7-2007; 309-317
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20066503
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2007/25/aa6503-06/aa6503-06.html
info:eu-repo/semantics/altIdentifier/arxiv/https://arxiv.org/abs/astro-ph/0703511v1
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
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
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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