Discovery of SiO band emission from galactic B[e] supergiants

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...

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Autores principales: Kraus, M., Oksala, M. E., Cidale, Lydia Sonia, Arias, María Laura, Torres, Andrea Fabiana, Borges Fernandes, M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
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Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86196
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id I19-R120-10915-86196
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
circumstellar matter
infrared: stars
stars: early-type
stars: massive
supergiants
spellingShingle Ciencias Astronómicas
circumstellar matter
infrared: stars
stars: early-type
stars: massive
supergiants
Kraus, M.
Oksala, M. E.
Cidale, Lydia Sonia
Arias, María Laura
Torres, Andrea Fabiana
Borges Fernandes, M.
Discovery of SiO band emission from galactic B[e] supergiants
topic_facet Ciencias Astronómicas
circumstellar matter
infrared: stars
stars: early-type
stars: massive
supergiants
description 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.
format Articulo
Articulo
author Kraus, M.
Oksala, M. E.
Cidale, Lydia Sonia
Arias, María Laura
Torres, Andrea Fabiana
Borges Fernandes, M.
author_facet Kraus, M.
Oksala, M. E.
Cidale, Lydia Sonia
Arias, María Laura
Torres, Andrea Fabiana
Borges Fernandes, M.
author_sort Kraus, M.
title Discovery of SiO band emission from galactic B[e] supergiants
title_short Discovery of SiO band emission from galactic B[e] supergiants
title_full Discovery of SiO band emission from galactic B[e] supergiants
title_fullStr Discovery of SiO band emission from galactic B[e] supergiants
title_full_unstemmed Discovery of SiO band emission from galactic B[e] supergiants
title_sort discovery of sio band emission from galactic b[e] supergiants
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86196
work_keys_str_mv AT krausm discoveryofsiobandemissionfromgalacticbesupergiants
AT oksalame discoveryofsiobandemissionfromgalacticbesupergiants
AT cidalelydiasonia discoveryofsiobandemissionfromgalacticbesupergiants
AT ariasmarialaura discoveryofsiobandemissionfromgalacticbesupergiants
AT torresandreafabiana discoveryofsiobandemissionfromgalacticbesupergiants
AT borgesfernandesm discoveryofsiobandemissionfromgalacticbesupergiants
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