The resolution of P Cygni's stellar wind

Details The resolution of P Cygni's stellar wind The resolution of P Cygni's stellar wind

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..657w&link_type=abstract

Astrophysical Journal, Part 1, vol. 262, Nov. 15, 1982, p. 657-662.

Other

72

Centimeter Waves, Radio Stars, Stellar Winds, Adiabatic Conditions, Cooling, Isothermal Processes, Temperature Measurement, Very Large Array (Vla)

Scientific paper

The 6 cm radio emission from P Cygni's stellar wind has been resolved using the Very Large Array. The wind is apparently spherically symmetric, and the radial surface brightness distribution agrees with that predicted by the constant velocity, isothermal wind model. The wind temperature is directly determined from the observations to be within 2000 K of 18,000, which is consistent with an effective temperature of 20,000 K for P Cygni. The technique makes it possible to study the adiabatic cooling of the wind, which should be important for most early-type stars but which cannot be recognized through its effects on the radio spectrum. To avoid systematically underestimating fluxes, it is essential to fit models directly to the (u-v) data when observing stellar winds with the VLA.

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