1998AJ....115.2483P

Viewed at 1' resolution at 1420 MHz, the source G74.5+0.9 appears as a double lobe structure of total length 20' with a moderately strong compact source located slightly off-center. Although its morphology is reminiscent of a typical extragalactic radio source with a central jet-core source, its infrared-to-radio ratio is more typical of an H II region. Furthermore, neutral hydrogen observations show the presence of an H I cavity at an LSR velocity of about -70 km.s^–1. Combining continuum radio, infrared, and optical observations, as well as H I data, we show that the source is compatible with the model of a bipolar H II region. If at its kinematic distance (about 12 kpc), the bipolar source has an overall length of about 60 pc and is powered by an O6 star. The possibility that the source is at a much closer distance of about 2 kpc, associated with material expanding toward us and away from the Cyg OB1/OB3 association, is also considered, in which case its overall dimension is only 12 pc and a B0 star is sufficient to power it. The nature of the central source is also discussed.