Correlations among O 2(0–1) atmospheric band, OH(8–3) band and [OI] 5577 Å line and among P1 (2), P1 (3) and P1 (4) lines of OH(8–3) band

Abstract

Using a photometer equipped with a cooled photomultiplier RCA-C31034A and an optics consisting of three aspheric lenses, the O 2(0–1) Atmospheric band at 8645 Å and the OH(8-3) band at 7274 Å are observed simultaneously from the ground level along with [OI] 5577 Å line, to investigate the instantaneous intensity changes. The P and R branches of O 2(0–1) Atmospheric band and the P 1(4), P 2(4), [ P 1(3) + P 2(3)] and [ P 1(2) + P 2(2)] lines of the OH(8-3) band are spectrally clearly resolved. It is found that the O 2(0–1) Atmospheric band and the OH(8-3) band covary fairly well in intensity; it seems that the correlation coefficient during the night lies around 0.500. Interrsity correlations between the OH(8-3) band and [OI] 5577 Å line are also investigated. It is found that the correlation coefficient during a night lies around −0.200 and thus the correlation between the OH(8-3) band and [OI] 5577 A line is weaker than that between the O 2(0–1) Atmospheric band and the OH(8-3) band. Correlations among P 1(4), [ P 1(3) + P 2(3)] and [ P 1(2) + P 2(2)] lines of the OH(8–3) band are studied, to find that their correlations are complete within an error of experiment; the correlation coefficient during a night ranges from 0.980 to 0.997. A midnight maximum of intensity of the OH(8-3) band is hardly found. During night the OH intensity always fairly fluctuates.