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dc.contributor.author
Oksala, M. E.
dc.contributor.author
Kraus, M.
dc.contributor.author
Cidale, Lydia Sonia
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dc.contributor.author
Muratore, M. F.
dc.contributor.author
Fernandes, M. Borges
dc.date.available
2016-11-30T14:51:18Z
dc.date.issued
2013-10
dc.identifier.citation
Oksala, M. E. ; Kraus, M.; Cidale, Lydia Sonia; Muratore, M. F. ; Fernandes, M. Borges; Probing the ejecta of evolved massive stars in transition: A VLT/SINFONI K-band survey; Edp Sciences; Astronomy And Astrophysics; 558; A17; 10-2013; 1-20
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/8492
dc.description.abstract
Massive evolved stars in transition phases, such as Luminous Blue Variables (LBVs), B[e] Supergiants (B[e]SGs), and Yellow Hypergiants (YHGs), are not well understood, and yet crucial steps in determining accurate stellar and galactic evolution models. The circumstellar environments of these stars reveal their mass-loss history, identifying clues to both their individual evolutionary status and the connection between objects of different phases. Here we present a survey of 25 such evolved massive stars (16 B[e]SGs, 6 LBVs, 2 YHGs, and 1 Peculiar Oe star), observed in the K-band with the Spectrograph for INtegral Field Observation in the Near-Infrared (SINFONI; R = 4500) on the ESO VLT UT4 8 m telescope. The sample can be split into two categories based on spectral morphology: one group includes all of the B[e]SGs, the Peculiar Oe star, and two of the LBVs, while the other includes the YHGs and the rest of the LBVs. The difference in LBV spectral appearance is due to some objects being in a quiescent phase and some objects being in an active or outburst phase. CO emission features are found in 13 of our targets, with first time detections for MWC 137, LHA 120-S 35, and LHA 115-S 65. From model fits to the CO band heads, the emitting regions appear to be detached from the stellar surface. Each star with 12CO features also shows 13CO emission, signaling an evolved nature. Based on the level of 13C enrichment, we conclude that many of the B[e]SGs are likely in a pre-Red Supergiant phase of their evolution. There appears to be a lower luminosity limit of log L/L_solar = 5.0 below which CO is not detected. The lack of CO features in several high luminosity B[e]SGs and variability in others suggests that they may in fact be LBV candidates, strengthening the connection between these two very similar transition phases.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Edp Sciences
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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
Infrared Stars
dc.subject
Massive Stars
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Circumstellar Matter
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Evolution of Stars
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Spectroscopic Techniques
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
Probing the ejecta of evolved massive stars in transition: A VLT/SINFONI K-band survey
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-11-18T15:10:45Z
dc.journal.volume
558
dc.journal.number
A17
dc.journal.pagination
1-20
dc.journal.pais
Francia
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dc.journal.ciudad
Paris
dc.description.fil
Fil: Oksala, M. E. . Akademie ved Ceské republiky. Astronomický ústav; República Checa
dc.description.fil
Fil: Kraus, M.. Akademie ved Ceské republiky. Astronomický ústav; República Checa
dc.description.fil
Fil: Cidale, Lydia Sonia. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
dc.description.fil
Fil: Muratore, M. F. . Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina
dc.description.fil
Fil: Fernandes, M. Borges. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil
dc.journal.title
Astronomy And Astrophysics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2013/10/aa21568-13/aa21568-13.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201321568
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