New assignments of the CaH $A^2\hat{I}-X^2\hat{I}{\pounds }^{+}$ transitions in the sunspot umbral spectrum and effective temperature estimation using molecular lines

Kosei Usami, Kaori Kobayashi, Hiroyuki Maehara

High-resolution spectroscopy observations of sunspots offer a unique natural laboratory for detailed molecular spectroscopy. Calcium monohydride (CaH) is a vital spectroscopic trac…