Infrared Diameter of IRC+10216 Determined from Lunar Occultations

Creators: Toombs, R. I.; Becklin, E. E.; Frogel, J. A.; Law, S. K.; Porter, F. C.; Westphal, J. A.

Abstract

Lunar occultations of IRC+10216 have been used to determine the size of the regions emitting 2.2-, 3.5-, 4.8-, and 10-μ radiation. The results are interpreted as the first direct measurement of the physical size of a dust shell surrounding a late-type star.

Additional Information

© 1972 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1972 February 9. We would like to thank Professor G. Neugebauer and members of the Caltech infrared group for their support of this work. For help in making the observations we would like to thank G. Clough, J. Mosher, T. Gregory, G. Tuton, B. Van't Sant, and E. Horine. D. Espenschield of the U.S. Naval Observatory kindly provided information on the lunar rate and position. E. E. B. and J. A. F. would like to thank the Smithsonian Astrophysical Observatory for use of the 60-inch Mount Hopkins telescope. This work was supported in part by National Aeronautics and Space Administration grants NGL 05-002-207 and NGL 05-002-007 to the California Institute of Technology. J. A. F. was supported in part by Harvard College Observatory.

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