SIMULTANEOUS OBSERVATIONS OF SiO AND H2O MASERS TOWARD KNOWN STELLAR SiO AND H2O MASER SOURCES. I.
SIMULTANEOUS OBSERVATIONS OF SiO AND H2O MASERS TOWARD KNOWN STELLAR SiO AND H2O MASER SOURCES. I.
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DOI：
10.1017/s1743921312007181
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Jaeheon Kim;Se-Hyung Cho;C. Oh;D. Byun
中科院分区：
文献类型：
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作者：
Jaeheon Kim;Se-Hyung Cho;C. Oh;D. Byun
We present the results of simultaneous observations of both SiO and H2O masers toward 166 known SiO and H2O maser sources using the Korean VLBI Network Yonsei 21 m radio telescope during 2009 June. Both SiO and H2O maser emission were detected from 112 sources giving a detection rate of 67% at one epoch observation. SiO-only maser emission was detected from 42 sources, while H2O-only maser emission was detected from four sources. Most of the SiO masers appear around the stellar velocity, while H2O masers show different characteristics compared with SiO masers. There are more than 20 sources that show a one-way peak or double peaks with respect to the stellar velocity and SiO maser peak velocity. The H2O maser peak and integrated intensity ratios with respect to those of SiO (v = 1) show increasingly larger values from Mira variables, to OH/IR stars, to semi-regular variables. In addition, the IRAS two-color diagram of SiO and H2O maser observational results is discussed.
