A radio loud semiregular variable
Abstract
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.
Cite
@article{arxiv.2407.20602,
title = {A radio loud semiregular variable},
author = {Pedro L. Luque-Escamilla and Josep Martí},
journal= {arXiv preprint arXiv:2407.20602},
year = {2024}
}
Comments
15 pages, 7 Figs, Accepted for publication in ApJ