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- Title
Presence of LaO, ScO and VO Molecular Lines in Sunspot Umbral Spectra.
- Authors
Sriramachandran, P.; Bagare, S. P.; Rajamanickam, N.; Balachandrakumar, K.
- Abstract
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: A 2 Π r1/2 – X 2 Σ +(0, 0; 0, 1), A 2 Π r3/2 – X 2 Σ +(1, 0), B 2 Σ + – X 2 Σ +(0, 0; 0, 1; 1, 0) and C 2 Π r1/2 – A′2Δ r3/2(0, 0; 1, 1) of LaO; A 2 Π r3/2 – X 2 Σ +(0, 0), A 2 Π r1/2 – X 2 Σ +(0, 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′2Δ 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.
- Subjects
SUNSPOTS; SOLAR activity; STARSPOTS; FOURIER transform spectroscopy; LANTHANUM compounds; OXIDES
- Publication
Solar Physics, 2008, Vol 252, Issue 2, p267
- ISSN
0038-0938
- Publication type
Article
- DOI
10.1007/s11207-008-9261-1