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dc.contributor.author
Kraus, M.
dc.contributor.author
Oksala, M. E.
dc.contributor.author
Cidale, Lydia Sonia
dc.contributor.author
Arias, María Laura
dc.contributor.author
Torres, A. F.
dc.contributor.author
Borges Fernandes, M.
dc.date.available
2017-03-22T18:21:37Z
dc.date.issued
2015-02
dc.identifier.citation
Kraus, M.; Oksala, M. E.; Cidale, Lydia Sonia; Arias, María Laura; Torres, A. F.; et al.; Discovery of SiO Band Emission from Galactic B[e] Supergiants; IOP Publishing; Astrophysical Journal; 800; 2; 2-2015; L20-L24
dc.identifier.issn
2041-8205
dc.identifier.uri
http://hdl.handle.net/11336/14183
dc.description.abstract
B[e] supergiants (B[e]SGs) are evolved massive stars in a short-lived transition phase. During this phase, these objects eject large amounts of material, which accumulate in a circumstellar disk-like structure. The expelled material is typically dense and cool, providing the cradle for molecule and dust condensation and for a rich, ongoing chemistry. Very little is known about the chemical composition of these disks, beyond the emission from dust and CO revolving around the star on Keplerian orbits. As massive stars preserve an oxygen-rich surface composition throughout their life, other oxygen-based molecules can be expected to form. As SiO is the second most stable oxygen compound, we initiated an observing campaign to search for first-overtone SiO emission bands. We obtained high-resolution near-infrared L-band spectra for a sample of Galactic B[e]SGs with reported CO band emission. We clearly detect emission from the SiO first-overtone bands in CPD-52 9243 and indications for faint emission in HD 62623, HD 327083, and CPD-57 2874. From model fits, we find that in all these stars the SiO bands are rotationally broadened with a velocity lower than observed in the CO band forming regions, suggesting that SiO forms at larger distances from the star. Hence, searching for and analyzing these bands is crucial for studying the structure and kinematics of circumstellar disks, because they trace complementary regions to the CO band formation zone. Moreover, since SiO molecules are the building blocks for silicate dust, their study might provide insight in the early stage of dust formation.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Circumstellar Matter
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Infrared Stars
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Early Type Stars
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Massive Stars
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Supergiants
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Discovery of SiO Band Emission from Galactic B[e] Supergiants
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-03-06T18:07:49Z
dc.journal.volume
800
dc.journal.number
2
dc.journal.pagination
L20-L24
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Londres
dc.description.fil
Fil: Kraus, M.. Astronomický Ústav; República Checa
dc.description.fil
Fil: Oksala, M. E.. Observatoire de Paris; Francia
dc.description.fil
Fil: Cidale, Lydia Sonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Astrofísica de la Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.description.fil
Fil: Arias, María Laura. 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: Torres, A. 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: Borges Fernandes, M.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil
dc.journal.title
Astrophysical Journal
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/2041-8205/800/2/L20
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/2041-8205/800/2/L20/meta


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