High-resolution Fourier Transform Spectrometer sunspot umbral spectra of the National Solar Observatory/National Optical Astronomy Observatory at Kitt Peak were used to detect rotational lines from 19 electronic transition bands of the molecules LaO, ScO and VO, in the wavenumber range of 11 775 to 20 600 cm −1 . The presence of lines from the following transitions is confirmed: 0) and B 2 Σ + -X 2 Σ + (0, 0) of ScO; and C 4 Σ − -X 4 Σ − (0, 1; 1, 0; 0, 2) and (2, 0) of VO. However, the presence of A 2 Π r3/2 -X 2 Σ + (0, 0) and C 2 Π r3/2 -A 2 r5/2 (0, 0; 1, 1) of LaO and C 4 Σ − -X 4 Σ − (0, 0) of VO are found to be doubtful because the lines are very weak, and detections are difficult owing to heavy blending by strong rotational lines of other molecules. Equivalent widths are measured for well-resolved lines and, thereby, the effective rotational temperatures are estimated for the systems for which the presence is confirmed.
High-resolution Fourier transform spectrometer sunspot umbral spectra obtained at the National Solar Observatory/Kitt Peak were used to identify molecular rotational lines arising from the infrared band systems of CrH and CrD molecules. Measurement of the equivalent width used the Gaussian-profile approximation method, which is suitable especially for faint lines. Equivalent widths are measured for an adequate number of best lines of the A -X (0, 0) band of CrH and the A -X (0, 0; 1, 0) bands of CrD and, thereby, the effective rotational temperatures are estimated.
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