Dense molecular environments of B[e] supergiants and yellow hypergiants

Massive stars expel large amounts of mass during their late evolutionary phases. We aim to unveil the physical conditions within the warm molecular environments of B[e] supergiants (B[e]SGs) and yellow hypergiants (YHGs), which are known to be embedded in circumstellar shells and disks. We present...

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Detalles Bibliográficos
Autores principales:	Kraus, Michaela, Kourniotis, Michalis, Arias, María Laura, Torres, Andrea Fabiana, Nickeler, Dieter H.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2023
Materias:	Ciencias Astronómicas stars: massive stars: supergiants stars: winds outflows circumstellar matter
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/159966
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-159966
record_format	dspace
spelling	I19-R120-10915-1599662023-11-09T20:03:53Z http://sedici.unlp.edu.ar/handle/10915/159966 Dense molecular environments of B[e] supergiants and yellow hypergiants Kraus, Michaela Kourniotis, Michalis Arias, María Laura Torres, Andrea Fabiana Nickeler, Dieter H. 2023 2023-11-09T12:28:37Z en Ciencias Astronómicas stars: massive stars: supergiants stars: winds outflows circumstellar matter Massive stars expel large amounts of mass during their late evolutionary phases. We aim to unveil the physical conditions within the warm molecular environments of B[e] supergiants (B[e]SGs) and yellow hypergiants (YHGs), which are known to be embedded in circumstellar shells and disks. We present K-band spectra of two B[e]SGs from the Large Magellanic Cloud and four Galactic YHGs. The CO band emission detected from the B[e]SGs LHA 120-S 12 and LHA 120-S 134 suggests that these stars are surrounded by stable rotating molecular rings. The spectra of the YHGs display a rather diverse appearance. The objects 6 Cas and V509 Cas lack any molecular features. The star [FMR2006] 15 displays blue-shifted CO bands in emission, which might be explained by a possible close to pole-on oriented bipolar outflow. In contrast, HD 179821 shows blue-shifted CO bands in absorption. While the star itself is too hot to form molecules in its outer atmosphere, we propose that it might have experienced a recent outburst. We speculate that we currently can only see the approaching part of the expelled matter because the star itself might still block the receding parts of a (possibly) expanding gas shell. Instituto de Astrofísica de La Plata Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas stars: massive stars: supergiants stars: winds outflows circumstellar matter
spellingShingle	Ciencias Astronómicas stars: massive stars: supergiants stars: winds outflows circumstellar matter Kraus, Michaela Kourniotis, Michalis Arias, María Laura Torres, Andrea Fabiana Nickeler, Dieter H. Dense molecular environments of B[e] supergiants and yellow hypergiants
topic_facet	Ciencias Astronómicas stars: massive stars: supergiants stars: winds outflows circumstellar matter
description	Massive stars expel large amounts of mass during their late evolutionary phases. We aim to unveil the physical conditions within the warm molecular environments of B[e] supergiants (B[e]SGs) and yellow hypergiants (YHGs), which are known to be embedded in circumstellar shells and disks. We present K-band spectra of two B[e]SGs from the Large Magellanic Cloud and four Galactic YHGs. The CO band emission detected from the B[e]SGs LHA 120-S 12 and LHA 120-S 134 suggests that these stars are surrounded by stable rotating molecular rings. The spectra of the YHGs display a rather diverse appearance. The objects 6 Cas and V509 Cas lack any molecular features. The star [FMR2006] 15 displays blue-shifted CO bands in emission, which might be explained by a possible close to pole-on oriented bipolar outflow. In contrast, HD 179821 shows blue-shifted CO bands in absorption. While the star itself is too hot to form molecules in its outer atmosphere, we propose that it might have experienced a recent outburst. We speculate that we currently can only see the approaching part of the expelled matter because the star itself might still block the receding parts of a (possibly) expanding gas shell.
format	Articulo Articulo
author	Kraus, Michaela Kourniotis, Michalis Arias, María Laura Torres, Andrea Fabiana Nickeler, Dieter H.
author_facet	Kraus, Michaela Kourniotis, Michalis Arias, María Laura Torres, Andrea Fabiana Nickeler, Dieter H.
author_sort	Kraus, Michaela
title	Dense molecular environments of B[e] supergiants and yellow hypergiants
title_short	Dense molecular environments of B[e] supergiants and yellow hypergiants
title_full	Dense molecular environments of B[e] supergiants and yellow hypergiants
title_fullStr	Dense molecular environments of B[e] supergiants and yellow hypergiants
title_full_unstemmed	Dense molecular environments of B[e] supergiants and yellow hypergiants
title_sort	dense molecular environments of b[e] supergiants and yellow hypergiants
publishDate	2023
url	http://sedici.unlp.edu.ar/handle/10915/159966
work_keys_str_mv	AT krausmichaela densemolecularenvironmentsofbesupergiantsandyellowhypergiants AT kourniotismichalis densemolecularenvironmentsofbesupergiantsandyellowhypergiants AT ariasmarialaura densemolecularenvironmentsofbesupergiantsandyellowhypergiants AT torresandreafabiana densemolecularenvironmentsofbesupergiantsandyellowhypergiants AT nickelerdieterh densemolecularenvironmentsofbesupergiantsandyellowhypergiants
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Dense molecular environments of B[e] supergiants and yellow hypergiants

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