Abstract
Time monitoring observations of the 28SiO v = 0–2, J = 3–2 transitions were performed on an annual basis from 1995 to 1998 with the 14 m radio telescope at Taeduk Radio Astronomy Observatory toward Orion KL IRc2 containing the 28SiO v = 1, J = 2–1 maser emission. On 1996 March 1, a violent line profile variation with three spikes was detected in the high-velocity component of the SiO v = 2, J = 3–2 maser. The strongest spike, with VLSR = 20.5 km s-1, constituted a new appearance. We suggest that the line profile variation of the SiO v = 2, J = 3–2 maser is probably the result of time variations in bipolar outflows from a young stellar object in the Orion KL IRc2 region. In addition, our observational results show that the high-velocity component of the SiO v = 2, J = 3–2 maser is the most active.
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