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Very Large Array observations of the extreme carbon star IRC+10216 at 7 mmwavelength with 40 milli-arcsecond resolution resolve the object's radioemission, which forms an almost round uniform disk of 83 milli arcsecondsdiameter, corresponding to 11 AU (for an assumed distance of 130 pc). We find abrightness temperature of 1630 K for the radio photosphere. Since the emissionis optically thick, we can directly estimate IRC+10216's average luminosity,which is 8600 L(Sun). This value is in excellent agreement with what ispredicted from the period-luminosity relation for carbon-rich Miras. Assumingan effective temperature of 2750 K for IRC+10216, it implies an opticalphotospheric diameter of 3.8 AU. Our precise determination of IRC+10216'sproper motion fits the picture presented by far-ultraviolet and far-infraredwavelength observations of its interaction region with the interstellar medium(its "astrosphere"): the star moves roughly in the direction expected from themorphology of the termination shock and its astrotail structures. Calculationof its three dimensional velocity and an analysis of the kinematics of itssurrounding interstellar medium (ISM) suggest an appreciable relative velocityof 42 km s/s, which is about half the value discussed in recent studies. Thissuggests a lower (time-averaged) mass loss rate and/or a higher ISM densitythan previously assumed.

The size, luminosity and motion of the extreme carbon star IRC+10216 (CW Leonis)