Polarimetric Imaging of the EGG Nebula with NICMOS

Details Polarimetric Imaging of the EGG Nebula with NICMOS Polarimetric Imaging of the EGG Nebula with NICMOS

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.8515w&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #85.15; Bulletin of the American Astronomical Society, Vol. 31, p.974

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used infrared polarimetric imaging with NICMOS to determine the precise position of the star that illuminates the protoplanetary reflection nebula CRL 2688 (the Egg Nebula). The position of this illuminating star, which is found at the location of the polarimetric centroid, is known to an accuracy of +/-0.03". The illuminating star cannot be seen in direct light even at 2.0 mu m. In order to illuminate both bipolar lobes yet be invisible in direct light in the near-infrared, the illuminating star must be surrounded by a disk that is optically thick in the near-infrared when viewed nearly edge-on. From the polarimetry map, we have determined the position angle of the polar axis (12(deg) ) and thus the orientation of the equatorial plane relative to the molecular hydrogen emission seen toward the waist of this nebula.

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