Browsing Faculty of Natural and Agricultural Sciences by Subject "H ii regions"

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    • New periodic 6.7 GHz class II methanol maser associated with G358.460−0.391 

      Maswanganye, J.P.; Goedhart, S.; Van der Walt, D.J.; Booth, R.S.; Gaylard, M.J. (Oxford Univ Press, 2015)
      Eight new class II methanol masers selected from the 6.7 GHz Methanol Multibeam survey catalogues I and II were monitored at 6.7 GHz with the 26 m Hartebeesthoek Radio Astronomy Observatory radio telescope for three years ...

    • Periodic class II methanol masers in G9.62+0.20E 

      Van der Walt, D.J.; Goedhart, S.; Gaylard, M.J. (Oxford Univ Press, 2009)
      We present the light curves of the 6.7 and 12.2 GHz methanol masers in the star-forming region G9.62+0.20E for a time-span of more than 2600 d. The earlier reported period of 244 d is confirmed. The results of monitoring ...

    • Short-period variability in the Class II methanol maser source G12.89+0.49 (IRAS 18089-1732) 

      Goedhart, S.; Langa, M.C.; Van der Walt, D.J.; Gaylard, M.J. (Oxford Univ Press, 2009)
      Time series are presented for the Class II methanol maser source G12.89+0.49, which has been monitored for nine years at the Hartebeesthoek Radio Astronomy Observatory. The 12.2 and 6.7 GHz methanol masers were seen to ...