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1 results

  • VLBI studies of SiO masers around VX Sagittarii

  • X. Chen, Z.-Q. Shen, D.-R. Jiang
  • Journal:
    Proceedings of the International Astronomical Union / Volume 3 / Issue S242 / March 2007
    Published online by Cambridge University Press:
    01 March 2007, pp. 312-313
    Print publication:
    March 2007
    • Article
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  • Observations of 43 GHz 28SiO (v = 1, J = 1-0) masers in the circumstellar envelope of the M-type semi-regular variable star VX Sgr were performed using the VLBA at 3 epochs during 1999 April-May. By tracing 42 matched maser features appearing in all the three epochs, we determined the contraction of an SiO maser shell toward VX Sgr at a velocity of about 4 km s−1 at a distance of 1.7 kpc to VX Sgr. We also report on some preliminary results from our first epoch of simultaneous VLBA observations of three 7 mm SiO masers toward VX Sgr.