Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter

Context. Chromospheric activity produces both photometric and spectroscopic variations that can be mistaken as planets. Large spots crossing the stellar disc can produce planet-like periodic variations in the light curve of a star. These spots clearly affect the spectral line profiles, and their per...

Descripción completa

Detalles Bibliográficos
Autores: Martínez Arnáiz, R., Maldonado, J., Montes Gutiérrez, David, Eiroa, C., Montesinos, B.
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/45054
Acceso en línea:https://hdl.handle.net/20.500.14352/45054
Access Level:acceso abierto
Palabra clave:52
CA-II-H
Multiwavelength optical observations
Sun-like stars
Main-sequence stars
Low-mass stars
Magnetic activity
Stellar-activity
Binary-systems
Cool stars
Echelle spectrograph
Astrofísica
Astronomía (Física)
id ES_16e7a992ea73daa7a72e8ad24d2e78de
oai_identifier_str oai:docta.ucm.es:20.500.14352/45054
network_acronym_str ES
network_name_str España
repository_id_str
spelling Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitterMartínez Arnáiz, R.Maldonado, J.Montes Gutiérrez, DavidEiroa, C.Montesinos, B.52CA-II-HMultiwavelength optical observationsSun-like starsMain-sequence starsLow-mass starsMagnetic activityStellar-activityBinary-systemsCool starsEchelle spectrographAstrofísicaAstronomía (Física)Context. Chromospheric activity produces both photometric and spectroscopic variations that can be mistaken as planets. Large spots crossing the stellar disc can produce planet-like periodic variations in the light curve of a star. These spots clearly affect the spectral line profiles, and their perturbations alter the line centroids creating a radial velocity jitter that might “contaminate” the variations induced by a planet. Precise chromospheric activity measurements are needed to estimate the activity-induced noise that should be expected for a given star. Aims. We obtain precise chromospheric activity measurements and projected rotational velocities for nearby (d ≤ 25 pc) cool (spectral types F to K) stars, to estimate their expected activity-related jitter. As a complementary objective, we attempt to obtain relationships between fluxes in different activity indicator lines, that permit a transformation of traditional activity indicators, i.e., Ca II H & K lines, to others that hold noteworthy advantages. Methods. We used high resolution (~50 000) echelle optical spectra. Standard data reduction was performed using the IRAF ECHELLE package. To determine the chromospheric emission of the stars in the sample, we used the spectral subtraction technique. We measured the equivalent widths of the chromospheric emission lines in the subtracted spectrum and transformed them into fluxes by applying empirical equivalent width and flux relationships. Rotational velocities were determined using the cross-correlation technique. To infer activity-related radial velocity (RV) jitter, we used empirical relationships between this jitter and the R’_HK index. Results. We measured chromospheric activity, as given by different indicators throughout the optical spectra, and projected rotational velocities for 371 nearby cool stars. We have built empirical relationships among the most important chromospheric emission lines. Finally, we used the measured chromospheric activity to estimate the expected RV jitter for the active stars in the sample.EDP ScienciesUniversidad Complutense de Madrid20102010-09-0120102010-09-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/45054reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/450542026-06-02T12:44:21Z
dc.title.none.fl_str_mv Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
title Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
spellingShingle Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
Martínez Arnáiz, R.
52
CA-II-H
Multiwavelength optical observations
Sun-like stars
Main-sequence stars
Low-mass stars
Magnetic activity
Stellar-activity
Binary-systems
Cool stars
Echelle spectrograph
Astrofísica
Astronomía (Física)
title_short Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
title_full Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
title_fullStr Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
title_full_unstemmed Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
title_sort Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
dc.creator.none.fl_str_mv Martínez Arnáiz, R.
Maldonado, J.
Montes Gutiérrez, David
Eiroa, C.
Montesinos, B.
author Martínez Arnáiz, R.
author_facet Martínez Arnáiz, R.
Maldonado, J.
Montes Gutiérrez, David
Eiroa, C.
Montesinos, B.
author_role author
author2 Maldonado, J.
Montes Gutiérrez, David
Eiroa, C.
Montesinos, B.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
CA-II-H
Multiwavelength optical observations
Sun-like stars
Main-sequence stars
Low-mass stars
Magnetic activity
Stellar-activity
Binary-systems
Cool stars
Echelle spectrograph
Astrofísica
Astronomía (Física)
topic 52
CA-II-H
Multiwavelength optical observations
Sun-like stars
Main-sequence stars
Low-mass stars
Magnetic activity
Stellar-activity
Binary-systems
Cool stars
Echelle spectrograph
Astrofísica
Astronomía (Física)
description Context. Chromospheric activity produces both photometric and spectroscopic variations that can be mistaken as planets. Large spots crossing the stellar disc can produce planet-like periodic variations in the light curve of a star. These spots clearly affect the spectral line profiles, and their perturbations alter the line centroids creating a radial velocity jitter that might “contaminate” the variations induced by a planet. Precise chromospheric activity measurements are needed to estimate the activity-induced noise that should be expected for a given star. Aims. We obtain precise chromospheric activity measurements and projected rotational velocities for nearby (d ≤ 25 pc) cool (spectral types F to K) stars, to estimate their expected activity-related jitter. As a complementary objective, we attempt to obtain relationships between fluxes in different activity indicator lines, that permit a transformation of traditional activity indicators, i.e., Ca II H & K lines, to others that hold noteworthy advantages. Methods. We used high resolution (~50 000) echelle optical spectra. Standard data reduction was performed using the IRAF ECHELLE package. To determine the chromospheric emission of the stars in the sample, we used the spectral subtraction technique. We measured the equivalent widths of the chromospheric emission lines in the subtracted spectrum and transformed them into fluxes by applying empirical equivalent width and flux relationships. Rotational velocities were determined using the cross-correlation technique. To infer activity-related radial velocity (RV) jitter, we used empirical relationships between this jitter and the R’_HK index. Results. We measured chromospheric activity, as given by different indicators throughout the optical spectra, and projected rotational velocities for 371 nearby cool stars. We have built empirical relationships among the most important chromospheric emission lines. Finally, we used the measured chromospheric activity to estimate the expected RV jitter for the active stars in the sample.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-09-01
2010
2010-09-01
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/20.500.14352/45054
url https://hdl.handle.net/20.500.14352/45054
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_ 1869403885603389440
score 15.300719

Similares en LA Referencia