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We conducted radio observations searching for OH 18-cm maser emission from asample of 169 unclassified MIPSGAL compact Galactic bubbles. These sources arethought to be the circumstellar envelopes of different kinds of evolved stars.Our observations were aimed at shedding light on the nature of MIPSGAL bubbles,since their characterisation is a fundamental aid for the development ofaccurate physical models of stellar and Galaxy evolution. The maser emission isobservatively linked to the last stages of the life of low- andintermediate-mass stars, which may constitute a significant fraction of theMIPSGAL bubbles. In particular OH masers are usually observed towards post-AGBstars. Our observations were performed with the Green Bank Telescope and, foreach source, produced spectra around the four OH 18-cm transitions. Theobservations were compared with archive interferometer data in order to excludepossible contamination from nearby sources. The main result is that the OHmaser emission is not a common feature among the MIPSGAL bubbles, with only onecertain detection. We conclude that among the MIPSGAL bubbles the post-AGBstars could be very rare.

Searching for OH maser emission towards the MIPSGAL compact Galactic bubbles