G-79.29- A YOUNG STELLAR-WIND SHELL IN CYGNUS-X(0.46 )

G 79.29+0.46 is a ring-like radio source with a diameter (at maximum b rightness) of similar to 3.2', discovered with the DRAO Synthesis Tele scope, It has been observed at three frequencies with the Very Large A rray. The flux density of the ring at 4.86 GHz, where the angular reso lution is similar to 4.6'', is (590 +/- 90) mJy, and the spectral inde x is beta = -0.03 +/- 0.10 (S proportional to nu(beta)), implying that the ring is an ionized hydrogen shell. At its center is a point radio source whose radio spectrum, based on data from 1.49 to 394 GHz, sugg ests that it is a mass-outflow object. For the point source, beta vari es from about +1.4 below 10 GHz to a value of similar to +0.6 at milli meter wavelengths. The central point source has been identified with a highly reddened star which has a strong H alpha emission line, from w hich a wind velocity of similar to 1400 km s(-1) is deduced. Infrared IRAS data imply a dust temperature of at least 225 K in the stellar wi nd, and similar to 65 K in the ionized shell. DRAG H I line observatio ns suggest that the shell is expanding at similar to 70 km s(-1) into an ambient (or circumstellar) medium of density similar to 25 cm(-3). Comparison of the shape of the observed red continuum emission from th e star (550-750 nm) with models of the continuum emission from early-t ype stars yields an extinction of similar to 16(m) giving an absolute visual magnitude of about -10. The suggested distance for the star is similar to 2 kpc, and it may be a ''luminous blue variable''. The wind from the star has swept up similar to 15 M. Of interstellar or circum stellar material, of which about half is now ionized by the star and t he rest forms the H I shell. The age of the shell is estimated to be s imilar to 10(4) yr The star may be an outlying member of the Cyg OB2 a ssociation.