• The contour intervals are
  • 1, 2, 3, 4, 5, 10, 25, 50 and 75% of peak at 850um and
  • 2, 4, 6, 8, 10, 25, 50 and 75% of peak at 450um.
• This star is clearly extended both at 850 and 450um.

IRC+10216 is variable with a period of ~635 days - see plot below. It had a phase of 0.6 (minimum flux) on July 14, 1998. The 850/450 data in the table (6.12Jy, 13.1Jy) are from Dec 97, while data from March/April 1998 give S(850) ~ 5.7 Jy/beam. It is also extended at 850 micron because of its unsually large and bright CO envelope, but can be observed without problems with a chop throw of 60" or larger.

It is well known that IRC+10216 is extended, yet there are few maps obtained with a 120" chop throw. The results in the table are based on 3 maps from December 1997. At 850 micron it has a deconvolved FWHM of 8.9" in good agreement with old UKT14 results. Fainter, halo-type emission is also clearly seen. A rough estimate of the halo emission predicts 3.4 Jy within a 30" radius and 6 Jy within a 60" radius. At 450 micron the corresponding values are 10.0 Jy and 14.5 Jy repspectively. The dust emission is more compact at 450 micron with a deconvolved FWHM of about 4.1". For mid December 1998 GS predicted an integrated 850 micron flux (core + halo) of 11.9 Jy and at 450 micron an integrated flux of 25.8 Jy.