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dc.date.accessioned 2023-11-09T12:28:37Z
dc.date.available 2023-11-09T12:28:37Z
dc.date.issued 2023
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/159966
dc.description.abstract 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. en
dc.language en es
dc.subject stars: massive es
dc.subject stars: supergiants es
dc.subject stars: winds es
dc.subject outflows es
dc.subject circumstellar matter es
dc.title Dense molecular environments of B[e] supergiants and yellow hypergiants en
dc.type Articulo es
sedici.identifier.other https://doi.org/10.3390/galaxies11030076 es
sedici.identifier.issn 2075-4434 es
sedici.creator.person Kraus, Michaela es
sedici.creator.person Kourniotis, Michalis es
sedici.creator.person Arias, María Laura es
sedici.creator.person Torres, Andrea Fabiana es
sedici.creator.person Nickeler, Dieter H. es
sedici.subject.materias Ciencias Astronómicas es
sedici.description.fulltext true es
mods.originInfo.place Instituto de Astrofísica de La Plata es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution 4.0 International (CC BY 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle Galaxies es
sedici.relation.journalVolumeAndIssue vol. 11, no. 3 es


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Creative Commons Attribution 4.0 International (CC BY 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution 4.0 International (CC BY 4.0)