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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 |