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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.19961 |
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| _version_ | 1866915213318553600 |
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| author | Kourniotis, Michalis Kraus, Michaela Arias, Maria Laura Cidale, Lydia S. |
| author_facet | Kourniotis, Michalis Kraus, Michaela Arias, Maria Laura Cidale, Lydia S. |
| contents | In this Letter, we shed light on the evolutionary phase of HD 144812, a Galactic yellow supergiant showing infrared excess that is typically expected for evolved stars undergoing enhanced mass-loss activity. We present high-resolution spectroscopy of the star in the $H-$ and $K-$band acquired with the GRating INfrared Spectrometer (IGRINS) and further explore multi-band imaging of the wider field of view from the ultraviolet to the radio regime. The IGRINS data reveal several lines from the hydrogen series and iron in a double-peaked emission and we here suggest, that HD 144812 is orbited by a disk-hosting companion. Furthermore, we report emission in the CO band heads of the star that is modeled to arise from a circum-stellar/binary disk (or ring) of ejected gas. The latter consists of material that is expected to have been dredged up from the core of the star to its surface during a prior phase as a red supergiant (RSG). These findings together suggest that HD 144812 is a rare, post-RSG star in a binary system, encouraging further investigation on the effect that the stellar encounters have on triggering instabilities and driving the evolution of the primary star shortly prior to the supernova event. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19961 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HD 144812: A transition-phase massive star in a binary system Kourniotis, Michalis Kraus, Michaela Arias, Maria Laura Cidale, Lydia S. Solar and Stellar Astrophysics In this Letter, we shed light on the evolutionary phase of HD 144812, a Galactic yellow supergiant showing infrared excess that is typically expected for evolved stars undergoing enhanced mass-loss activity. We present high-resolution spectroscopy of the star in the $H-$ and $K-$band acquired with the GRating INfrared Spectrometer (IGRINS) and further explore multi-band imaging of the wider field of view from the ultraviolet to the radio regime. The IGRINS data reveal several lines from the hydrogen series and iron in a double-peaked emission and we here suggest, that HD 144812 is orbited by a disk-hosting companion. Furthermore, we report emission in the CO band heads of the star that is modeled to arise from a circum-stellar/binary disk (or ring) of ejected gas. The latter consists of material that is expected to have been dredged up from the core of the star to its surface during a prior phase as a red supergiant (RSG). These findings together suggest that HD 144812 is a rare, post-RSG star in a binary system, encouraging further investigation on the effect that the stellar encounters have on triggering instabilities and driving the evolution of the primary star shortly prior to the supernova event. |
| title | HD 144812: A transition-phase massive star in a binary system |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2503.19961 |