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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.20602 |
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| _version_ | 1866913451787419648 |
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| author | Luque-Escamilla, Pedro L. Martí, Josep |
| author_facet | Luque-Escamilla, Pedro L. Martí, Josep |
| contents | As a byproduct of our search for Galactic stellar systems with gamma-ray emission, we have identified an unrelated cool and evolved star (IRC-10412) that attracted our attention due to its strong radio emission level with a spectral index matching, almost perfectly, the canonical +0.6 value expected from an ionized stellar wind. A follow-up observational analysis was undertaken given that these two properties are hard to reconcile as originating in the same stellar object. As a result, IRC-10412 has been classified as a new semiregular variable of SRb type in the asymptotic giant branch, and different but consistent estimates of its mass-loss parameter are reported. We propose that its unusually high radio emission arises from a ~ 1E-5 Msun/yr stellar wind exposed to an external source of ionizing photons, possibly coming from nearby OB associations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20602 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A radio loud semiregular variable Luque-Escamilla, Pedro L. Martí, Josep Solar and Stellar Astrophysics As a byproduct of our search for Galactic stellar systems with gamma-ray emission, we have identified an unrelated cool and evolved star (IRC-10412) that attracted our attention due to its strong radio emission level with a spectral index matching, almost perfectly, the canonical +0.6 value expected from an ionized stellar wind. A follow-up observational analysis was undertaken given that these two properties are hard to reconcile as originating in the same stellar object. As a result, IRC-10412 has been classified as a new semiregular variable of SRb type in the asymptotic giant branch, and different but consistent estimates of its mass-loss parameter are reported. We propose that its unusually high radio emission arises from a ~ 1E-5 Msun/yr stellar wind exposed to an external source of ionizing photons, possibly coming from nearby OB associations. |
| title | A radio loud semiregular variable |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2407.20602 |