• SCUBA data from February 1998. 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.
• The excess noise in the west of the 450um map is due to less overlap of coadds in that region of the map.

Click here for a postscript (508kB) image of OH231.8, IRC+10216 and CRL2688.

As with CRL2688, OH231.8 could be marginally extended. At 450 micron a FWHM of 8.7" is obtained, but there are no planet data to compare with. A target object observed during one of the nights give a FWHM of 8.1", while a single map of CRL618 gives 8.5". It may therefore be classified as 'compact' until more accurate maps are available. Examination of integrated fluxes suggest excess emission of < 200 mJy in a 30" radius at 850 micron and less than 600 mJy at 450 micron, which argues for OH231.8 being a point source.

Data between 1997.0 and 2001.4 suggest a periodicity of 630+20^d, cf   650^d-710^d in the infrared (Feast et al 1983, MNRAS 203, 1207, Bowers & Morris 1984, ApJ 276, 646, Kastner et al 1992 ApJ 398, 552).