G79.29 + 0.46: A young stellar-wind shell in Cygnus X

Details G79.29 + 0.46: A young stellar-wind shell in Cygnus X G79.29 + 0.46: A young stellar-wind shell in Cygnus X

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..295h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. 295-309

Astronomy and Astrophysics

Astronomy

31

Interstellar Extinction, Interstellar Matter, Radio Sources (Astronomy), Stellar Envelopes, Stellar Winds, Hydrogen, Radio Spectra, Stellar Magnitude, Variable Stars, Very Large Array (Vla)

Scientific paper

G 79.29 + 0.46 is a ring-like radio source with a diameter (at maximum brightness) of approximately 3.2 min, discovered with the Dominion Radio Astrophysical Observatory (DRAO) Synthesis Telescope. It has been observed at three frequencies with the Very Large Array (VLA). The flux density of the ring at 4.86 GHz, where the angular resolution is approximately 4.6 sec, is (590 +/- 90) mJy, and the spectral index is beta = -0.03 +/- 0.10 (S proportional to nubeta, 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, suggests that it is a mass-outflow object. For the point source, beta varies from about +1.4 below 10 GHz to a value of approximately +0.6 at millimeter wavelengths. The central point source has been identified with a highly reddened star which has a strong H alpha emission line, from which a wind velocity of approximately 1400 km/s is deduced. Infrared IRAS data imply a dust temperature of at least 125 K in the stellar wind, and approximately 65 K in the ionized shell. DRAO H I line observations suggest that the shell is expanding at approximately 70 km/s into an ambient (or circumstellar) medium of density approximately 25 /cu.cm. Comparison of the shape of the observed red continuum emission from the star (550-750 nm) with models of the continuum emission from early-type stars yields an extinction of approximately of 16 mag, giving an absolute visual magnitude of about -10. The suggested distance for the star is approximately 2 kpc, and it may be a 'luminous blue variable.' The wind from the star has swept up approximately 15 solar mass of interstellar or circumstellar material, of which about half is now ionized by the star and the rest forms the H I shell. The age of the shell is estimated to be approximately 104 yr. The star may be an outlying member of the Cyg OB2 association.

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