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On the Detection of Iron Carbide, FeC, in Circumstellar Environments
L. A. Koelemay and L. M. Ziurys
reported on
Elusive Iron: Detection of the FeC Radical (X<sup>3</sup>Δ<sub>i</sub>) in the Envelope of IRC+10216
Astrophys. J. Lett. 958, Art. No. L6 (2023).
Dedicated observations of CW Leonis with the ARO 12 m dish at Kitt Peak as well as observations (dedicated and from a line survey) with the ARO SMT in the regions of the 2Π3/2, J“ = 7.5, 12.5, 15.5, and 16.5 transitions of SiP. Only the J” = 12.5 and 15.5 transitions near 215.05 and 262.81 GHz appear to be unblended. While this is fine for a tentative detection, it is too little for us to qualify for a definitive detection. The authors derive peak abundances only slightly lower than CP and even slightly higher than PN, but somewhat closer to the star.
Contributor(s): H. S. P. Müller; 11, 2023