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Using the Very Large Array (VLA) at 3.6~cm we identify four new compact radiosources in the vicinity of the cometary HII region G78.4+2.6 (VLA~1). The fourcompact radio sources (named VLA~2 to VLA~5), have near-infrared counterparts,as seen in the 3.6 $\mu$m Spitzer image. One of them (VLA~5) clearly showsevidence of radio variability in a timescale of hours. We explore thepossibility that these radio sources are associated with pre-main sequence(PMS) stars in the vicinity of the UC HII region G78.4+2.6. Our results favorthe smaller distance value of 1.7 kpc for G78.4+2.6. In addition to thedetection of the radio sources in the vicinity of G78.4+2.6, we detectedanother group of five sources which appear located about 3' to the northwest ofthe HII region. Some of them exhibit extended emission.

Compact radio sources in the vicinity of the ultracompact HII region G78.4+2.6