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A Radio-loud Semiregular Variable
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DOI：10.3847/1538-4357/ad6842.png)
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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 similar to 10-5 M circle dot yr-1 stellar wind exposed to an external source of ionizing photons, possibly coming from nearby OB associations.
Keyword:
LONG-PERIOD VARIABLES
GIANT BRANCH STARS
MASS-LOSS
OPTICAL-PROPERTIES
MIRA VARIABLES
EVOLVED STARS
AGB STARS
DUST
CLASSIFICATION
IDENTIFICATION
期刊
IF:
5.4
论文数:
8.3W
被引数:
32.0W
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