A Radio-loud Semiregular Variable

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...

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Bibliographic Details
Published in:The Astrophysical journal 2024-10, Vol.973 (2), p.127
Main Authors: Luque-Escamilla, Pedro L., Martí, Josep
Format: Article
Language:English
Subjects:
Asymptotic giant branch stars
Emissions
Gamma emission
Gamma rays
Parameter estimation
Radio emission
Semiregular variable stars
Stellar mass loss
Stellar systems
Stellar winds
Variable stars
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Summary: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 ∼10 −5 M ⊙ yr −1 stellar wind exposed to an external source of ionizing photons, possibly coming from nearby OB associations.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad6842