• J. B. Su

      Articles written in Journal of Astrophysics and Astronomy

    • Pumping Mechanisms for SiO Masers around VX Sgr

      J. B. Su Z.-Q. Shen X. Chen Jiyune Yi D. R. Jiang Y. J. Yun

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      VX Sgr, a semi-regular variable, is a red giant star with intense SiO maser emission at 43 GHz. The pumping mechanism of the circumstellar SiO masers has been controversial for decades since its discovery. In order to pursue this long-standing problem further, we have carried out simultaneous VLBA observations of two 7 mm SiO masers at five epochs in about two years. We present relatively aligned 𝑣 = 1 and 𝑣 = 2, 𝐽 = 1-0 SiO maser maps and discuss the dominant pumping mechanism, which may be epoch dependent or a combination of both mechanisms.

    • Outward Motions of SiO Masers around VX Sgr

      J. B. Su Z.-Q. Shen X. Chen D. R. Jiang

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      We report the proper motions of SiO maser features around VX Sgr from the two-epoch VLBA observations (2006 December 15 and 2007 August 19). The majority of maser feature activities show a trend of outward motions. It is consistent with our previous finding that the outflow may play an important role for SiO maser pumping.

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      Posted on January 27, 2016

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