Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-09
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures, iaus.cls, to appear in IAU Symp. 242 proceedings (Astrophysical masers and their environments)
Scientific paper
10.1017/S1743921307013117
We present the results of SiO line observations of a sample of known SiO maser sources covering a wide dust-temperature range. The aim of the present research is to investigate the causes of the correlation between infrared colors and SiO maser intensity ratios among different transition lines. We observed in total 75 SiO maser sources with the Nobeyama 45m telescope quasi-simultaneously in the SiO J=1-0 v=0, 1, 2, 3, 4 and J=2-1 v=1, 2 lines. We also observed the sample in the 29SiO J=1-0 v=0 and J=2-1 v=0, and 30SiO J=1-0 v=0 lines, and the H2O 6(1,6)-5(2,3) line. As reported in previous papers, we confirmed that the intensity ratios of the SiO J=1-0 v=2 to v=1 lines clearly correlate with infrared colors. In addition, we found possible correlation between infrared colors and the intensity ratios of the SiO J=1-0 v=3 to v=1&2 lines.
Deguchi Shuji
Nakashima Jun-ichi
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