B[e]超巨星和黄超巨星的密集分子环境

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS Galaxies Pub Date : 2023-06-16 DOI:10.3390/galaxies11030076
M. Kraus, Michalis Kourniotis, M. Arias, A. Torres, D. Nickeler
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引用次数: 0

摘要

大质量恒星在其进化后期排出大量质量。我们的目标是揭示B[e]超巨星(B[e]SG)和黄超巨星(YHG)温暖分子环境中的物理条件,这些超巨星已知嵌入星周壳和盘中。我们给出了来自大麦哲伦星云的两个B[e]SG和四个银河系YHG的K波段光谱。从B[e]SGs LHA 120-S 12和LHA 120-S134探测到的CO波段发射表明,这些恒星被稳定的旋转分子环包围。YHG的光谱显示出相当多样化的外观。对象6 Cas和V509 Cas缺乏任何分子特征。恒星[FMR206]15在发射中显示出蓝移的CO带,这可能是由可能接近极点的定向双极流出所解释的。相反,HD 179821在吸收中显示出蓝移的CO带。虽然恒星本身太热,无法在外层大气中形成分子,但我们认为它可能经历了最近的爆发。我们推测,我们目前只能看到被排出物质的接近部分,因为恒星本身可能仍会阻挡(可能)膨胀的气体外壳的后退部分。
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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 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.
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来源期刊
Galaxies
Galaxies Physics and Astronomy-Astronomy and Astrophysics
CiteScore
4.90
自引率
12.00%
发文量
100
审稿时长
11 weeks
期刊介绍: Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.
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