G213.0$-$0.6, a true supernova remnant or just an HII region?

X. Y. Gao, C. J. Wu, X. H. Sun +2

G213.0$-$0.6 is a faint extended source situated in the anti-center region of the Galactic plane. It has been classified as a shell-type supernova remnant (SNR) based on its shell-…