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The size, luminosity, and motion of the extreme carbon star IRC+10216 (CW Leonis)
2012
Astronomy and Astrophysics
Very Large Array observations of the extreme carbon star IRC+10216 at 7 mm wavelength with 40 milli-arcsecond resolution resolve the object's radio emission, which forms an almost round uniform disk of 83 milli arcseconds diameter, corresponding to 11 AU (for an assumed distance of 130 pc). We find a brightness temperature of 1630 K for the radio photosphere. Since the emission is optically thick, we can directly estimate IRC+10216's average luminosity, which is 8600 L(Sun). This value is in
doi:10.1051/0004-6361/201219422
fatcat:fn5qyem6gvemllaibmsts6pa64