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dc.contributor.author
Aguayo, G.
dc.contributor.author
Mennickent, R. E.
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dc.contributor.author
Granada, Anahi
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dc.contributor.author
Otero, S.
dc.date.available
2019-08-28T20:22:25Z
dc.date.issued
2018-10
dc.identifier.citation
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
dc.identifier.issn
0004-6256
dc.identifier.uri
http://hdl.handle.net/11336/82431
dc.description.abstract
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 Visual estimates during the epoch of our L-band spectroscopy are also presented for the first time, together with the unpublished complete visual light curve between the years 1998 and 2014.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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Be
dc.subject
Circumstellar Matter
dc.subject
Infrared: Stars
dc.subject
Stars: Emission-Line
dc.subject
Stars: Mass-Loss
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Multi-epoch L-band Spectroscopy of the Be Star μ Centauri Prior to Outburst
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-08-16T16:49:32Z
dc.journal.volume
156
dc.journal.number
4
dc.journal.pagination
1-11
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Aguayo, G.. Universidad de Concepcion, Chile; Chile
dc.description.fil
Fil: Mennickent, R. E.. Universidad de Concepcion, Chile; Chile
dc.description.fil
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
dc.description.fil
Fil: Otero, S.. American Association Of Variable Star Observers; Estados Unidos
dc.journal.title
Astronomical Journal
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.3847/1538-3881/aad5db
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-3881/aad5db
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