Time Variation in the Radio Flux Density from the Bipolar Ultracompact H II Region NGC 7538 IRS1

Ramiro Franco-Hernández, Luis F. Rodrí guez

We present high angular resolution ($\sim 0\text{.}{}^{\prime \prime }1$-$0\text{.}{}^{\prime \prime }4$) VLA observations at 2 and 6 cm made in 1983, 1986, and 1995 toward the ultracompact bipolar H II region NGC 7…