The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries

In this work we analyze the behaviour of the excess Ca II H & K and H emissions in a sample of 73 chromospherically active binary systems (RS CVn and BY Dra classes), of diferent activity levels and luminosity classes. This sample includes the 53 stars analyzed by Fernández-Figueroa et al. (1994...

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Detalles Bibliográficos
Autores: Montes Gutiérrez, David, Fernández Figueroa, María José, Cornide Castro-Piñeiro, Manuel, Castro Rubio, Elisa De
Tipo de recurso: artículo
Fecha de publicación:1996
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/57928
Acceso en línea:https://hdl.handle.net/20.500.14352/57928
Access Level:acceso abierto
Palabra clave:52
Rs-canum-venaticorum
Main-sequence stars
Solar-type stars
Cool stars
Magnetic-structure
Alpha emission
Stellar activity
Synchronized binaries
Radiative losses
By-draconis
Astrofísica
Astronomía (Física)
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oai_identifier_str oai:docta.ucm.es:20.500.14352/57928
network_acronym_str ES
network_name_str España
repository_id_str
spelling The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binariesMontes Gutiérrez, DavidFernández Figueroa, María JoséCornide Castro-Piñeiro, ManuelCastro Rubio, Elisa De52Rs-canum-venaticorumMain-sequence starsSolar-type starsCool starsMagnetic-structureAlpha emissionStellar activitySynchronized binariesRadiative lossesBy-draconisAstrofísicaAstronomía (Física)In this work we analyze the behaviour of the excess Ca II H & K and H emissions in a sample of 73 chromospherically active binary systems (RS CVn and BY Dra classes), of diferent activity levels and luminosity classes. This sample includes the 53 stars analyzed by Fernández-Figueroa et al. (1994) and the observations of 28 systems described by Montes et al. (1995c). By using the spectral subtraction technique (subtraction of a synthesized stellar spectrum constructed from reference stars of spectral type and luminosity class similar to those of the binary star components) we obtain the active chromosphere contribution to the Ca II H & K lines in these 73 systems. We have determined the excess Ca ii H & K emission equivalent widths and converted them into surface fluxes. The emissions arising from each component were obtained when it was possible to deblend both contributions. We have found that the components of active binaries are generally stronger emitters than single active stars for a given effective temperature and rotation rate. A slight decline of the excess Ca II H & K emissions towards longer rotation periods_(1) P_(rot1) and larger Rossby numbers, R_(01) is found. When we use R_(0) instead of P_(rot) the scatter is reduced and a saturation at R_(0)≈ 0.3 is observed. A good correlation between the excess Ca II K and He chromospheric emission fluxes has been found. The correlations obtained between the excess Ca II K emission and other activity indicators, (C IV in the transition region, and X-rays in the corona) indicate that the exponents of the power-law relations increase with the formation temperature of the spectral features.EDP ScienciesUniversidad Complutense de Madrid19961996-08-0119961996-08-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/57928reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/579282026-06-02T12:44:21Z
dc.title.none.fl_str_mv The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
title The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
spellingShingle The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
Montes Gutiérrez, David
52
Rs-canum-venaticorum
Main-sequence stars
Solar-type stars
Cool stars
Magnetic-structure
Alpha emission
Stellar activity
Synchronized binaries
Radiative losses
By-draconis
Astrofísica
Astronomía (Física)
title_short The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
title_full The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
title_fullStr The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
title_full_unstemmed The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
title_sort The behaviour of the excess Ca II H and K and H epsilon emissions in chromospherically active binaries
dc.creator.none.fl_str_mv Montes Gutiérrez, David
Fernández Figueroa, María José
Cornide Castro-Piñeiro, Manuel
Castro Rubio, Elisa De
author Montes Gutiérrez, David
author_facet Montes Gutiérrez, David
Fernández Figueroa, María José
Cornide Castro-Piñeiro, Manuel
Castro Rubio, Elisa De
author_role author
author2 Fernández Figueroa, María José
Cornide Castro-Piñeiro, Manuel
Castro Rubio, Elisa De
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Rs-canum-venaticorum
Main-sequence stars
Solar-type stars
Cool stars
Magnetic-structure
Alpha emission
Stellar activity
Synchronized binaries
Radiative losses
By-draconis
Astrofísica
Astronomía (Física)
topic 52
Rs-canum-venaticorum
Main-sequence stars
Solar-type stars
Cool stars
Magnetic-structure
Alpha emission
Stellar activity
Synchronized binaries
Radiative losses
By-draconis
Astrofísica
Astronomía (Física)
description In this work we analyze the behaviour of the excess Ca II H & K and H emissions in a sample of 73 chromospherically active binary systems (RS CVn and BY Dra classes), of diferent activity levels and luminosity classes. This sample includes the 53 stars analyzed by Fernández-Figueroa et al. (1994) and the observations of 28 systems described by Montes et al. (1995c). By using the spectral subtraction technique (subtraction of a synthesized stellar spectrum constructed from reference stars of spectral type and luminosity class similar to those of the binary star components) we obtain the active chromosphere contribution to the Ca II H & K lines in these 73 systems. We have determined the excess Ca ii H & K emission equivalent widths and converted them into surface fluxes. The emissions arising from each component were obtained when it was possible to deblend both contributions. We have found that the components of active binaries are generally stronger emitters than single active stars for a given effective temperature and rotation rate. A slight decline of the excess Ca II H & K emissions towards longer rotation periods_(1) P_(rot1) and larger Rossby numbers, R_(01) is found. When we use R_(0) instead of P_(rot) the scatter is reduced and a saturation at R_(0)≈ 0.3 is observed. A good correlation between the excess Ca II K and He chromospheric emission fluxes has been found. The correlations obtained between the excess Ca II K emission and other activity indicators, (C IV in the transition region, and X-rays in the corona) indicate that the exponents of the power-law relations increase with the formation temperature of the spectral features.
publishDate 1996
dc.date.none.fl_str_mv 1996
1996-08-01
1996
1996-08-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/57928
url https://hdl.handle.net/20.500.14352/57928
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciencies
publisher.none.fl_str_mv EDP Sciencies
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869404368484171776
score 15,300719

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