Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst

Autores
Aguayo, G.; Mennickent, R. E.; Granada, Anahi; Otero, S.
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
With the aim of contributing to the understanding of the disk formation process in Be stars, we pursued a one-year spectroscopic observing campaign of the Be star μ Centauri in the L-band, using VLT/ISAAC. We present the nine near-IR spectra we obtained in an epoch of relative photometric quiescence prior to an outburst of ΔV = 0.4 magnitude. Visual estimates during the epoch of our L-band spectroscopy are also presented for the first time, together with the unpublished complete visual light curve between the years 1998 and 2014. We observe significant and monotonic changes in emission line strength of Bracket-α and Pfund-γ lines relative to Humphreys lines, and also in the continuum slope. We interpret these observed changes in terms of important changes to the column density of the line emitting regions, moving from an optically thin to an optically thick stage just prior to a major outburst. For each observing date, we provide estimates for the column density and relative extension of the line emitting region. If the changes observed toward the end of our observing campaign were related to mass-loss changes from the central star, they would correspond to an increase in a factor of two in the mass of the disk in the innermost region. If related to the visual outburst observed one month later, the variability observed in our spectra would be the first detection of the early disk formation process in the L-band.
Fil: Aguayo, G.. Universidad de Concepcion, Chile; Chile
Fil: Mennickent, R. E.. Universidad de Concepcion, Chile; Chile
Fil: Granada, Anahi. Western University; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Otero, S.. American Association Of Variable Star Observers; Estados Unidos
Materia
BE
CIRCUMSTELLAR MATTER
INFRARED: STARS
STARS: EMISSION-LINE
STARS: MASS-LOSS
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:11336/82431
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to OutburstAguayo, G.Mennickent, R. E.Granada, AnahiOtero, S.BECIRCUMSTELLAR MATTERINFRARED: STARSSTARS: EMISSION-LINESTARS: MASS-LOSShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1With the aim of contributing to the understanding of the disk formation process in Be stars, we pursued a one-year spectroscopic observing campaign of the Be star μ Centauri in the L-band, using VLT/ISAAC. We present the nine near-IR spectra we obtained in an epoch of relative photometric quiescence prior to an outburst of ΔV = 0.4 magnitude. Visual estimates during the epoch of our L-band spectroscopy are also presented for the first time, together with the unpublished complete visual light curve between the years 1998 and 2014. We observe significant and monotonic changes in emission line strength of Bracket-α and Pfund-γ lines relative to Humphreys lines, and also in the continuum slope. We interpret these observed changes in terms of important changes to the column density of the line emitting regions, moving from an optically thin to an optically thick stage just prior to a major outburst. For each observing date, we provide estimates for the column density and relative extension of the line emitting region. If the changes observed toward the end of our observing campaign were related to mass-loss changes from the central star, they would correspond to an increase in a factor of two in the mass of the disk in the innermost region. If related to the visual outburst observed one month later, the variability observed in our spectra would be the first detection of the early disk formation process in the L-band.Fil: Aguayo, G.. Universidad de Concepcion, Chile; ChileFil: Mennickent, R. E.. Universidad de Concepcion, Chile; ChileFil: Granada, Anahi. Western University; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Otero, S.. American Association Of Variable Star Observers; Estados UnidosIOP Publishing2018-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/82431Aguayo, G.; Mennickent, R. E.; Granada, Anahi; Otero, S.; Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst; IOP Publishing; Astronomical Journal; 156; 4; 10-2018; 1-110004-6256CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3847/1538-3881/aad5dbinfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-3881/aad5dbinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:26:03Zoai:ri.conicet.gov.ar:11336/82431instacron: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 10:26:04.251CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
title Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
spellingShingle Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
Aguayo, G.
BE
CIRCUMSTELLAR MATTER
INFRARED: STARS
STARS: EMISSION-LINE
STARS: MASS-LOSS
title_short Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
title_full Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
title_fullStr Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
title_full_unstemmed Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
title_sort Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
dc.creator.none.fl_str_mv Aguayo, G.
Mennickent, R. E.
Granada, Anahi
Otero, S.
author Aguayo, G.
author_facet Aguayo, G.
Mennickent, R. E.
Granada, Anahi
Otero, S.
author_role author
author2 Mennickent, R. E.
Granada, Anahi
Otero, S.
author2_role author
author
author
dc.subject.none.fl_str_mv BE
CIRCUMSTELLAR MATTER
INFRARED: STARS
STARS: EMISSION-LINE
STARS: MASS-LOSS
topic BE
CIRCUMSTELLAR MATTER
INFRARED: STARS
STARS: EMISSION-LINE
STARS: MASS-LOSS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv With the aim of contributing to the understanding of the disk formation process in Be stars, we pursued a one-year spectroscopic observing campaign of the Be star μ Centauri in the L-band, using VLT/ISAAC. We present the nine near-IR spectra we obtained in an epoch of relative photometric quiescence prior to an outburst of ΔV = 0.4 magnitude. Visual estimates during the epoch of our L-band spectroscopy are also presented for the first time, together with the unpublished complete visual light curve between the years 1998 and 2014. We observe significant and monotonic changes in emission line strength of Bracket-α and Pfund-γ lines relative to Humphreys lines, and also in the continuum slope. We interpret these observed changes in terms of important changes to the column density of the line emitting regions, moving from an optically thin to an optically thick stage just prior to a major outburst. For each observing date, we provide estimates for the column density and relative extension of the line emitting region. If the changes observed toward the end of our observing campaign were related to mass-loss changes from the central star, they would correspond to an increase in a factor of two in the mass of the disk in the innermost region. If related to the visual outburst observed one month later, the variability observed in our spectra would be the first detection of the early disk formation process in the L-band.
Fil: Aguayo, G.. Universidad de Concepcion, Chile; Chile
Fil: Mennickent, R. E.. Universidad de Concepcion, Chile; Chile
Fil: Granada, Anahi. Western University; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Otero, S.. American Association Of Variable Star Observers; Estados Unidos
description With the aim of contributing to the understanding of the disk formation process in Be stars, we pursued a one-year spectroscopic observing campaign of the Be star μ Centauri in the L-band, using VLT/ISAAC. We present the nine near-IR spectra we obtained in an epoch of relative photometric quiescence prior to an outburst of ΔV = 0.4 magnitude. Visual estimates during the epoch of our L-band spectroscopy are also presented for the first time, together with the unpublished complete visual light curve between the years 1998 and 2014. We observe significant and monotonic changes in emission line strength of Bracket-α and Pfund-γ lines relative to Humphreys lines, and also in the continuum slope. We interpret these observed changes in terms of important changes to the column density of the line emitting regions, moving from an optically thin to an optically thick stage just prior to a major outburst. For each observing date, we provide estimates for the column density and relative extension of the line emitting region. If the changes observed toward the end of our observing campaign were related to mass-loss changes from the central star, they would correspond to an increase in a factor of two in the mass of the disk in the innermost region. If related to the visual outburst observed one month later, the variability observed in our spectra would be the first detection of the early disk formation process in the L-band.
publishDate 2018
dc.date.none.fl_str_mv 2018-10
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/11336/82431
Aguayo, G.; Mennickent, R. E.; Granada, Anahi; Otero, S.; Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst; IOP Publishing; Astronomical Journal; 156; 4; 10-2018; 1-11
0004-6256
CONICET Digital
CONICET
url http://hdl.handle.net/11336/82431
identifier_str_mv Aguayo, G.; Mennickent, R. E.; Granada, Anahi; Otero, S.; Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst; IOP Publishing; Astronomical Journal; 156; 4; 10-2018; 1-11
0004-6256
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-3881/aad5db
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-3881/aad5db
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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