Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..809j&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 809-813.
Astronomy and Astrophysics
Astronomy
11
Infrared Sources (Astronomy), Nebulae, Sky Surveys (Astronomy), Cosmic Dust, Emission Spectra, Stellar Envelopes, Stellar Evolution, Temperature Gradients, Visible Spectrum
Scientific paper
Mid-IR images of AFGL 2688, the Egg nebula, obtained with a 16 x 16 pixel array camera (field of view 12.5 x 12.5 arcsec) resolve the central source. It appears as a centrally peaked ellipsoid with major axis of symmetry parallel to the axis of the visible nebulosity. This is contrary to the expected extension perpendicular to this axis implied by proposed dust-toroid models of the IR source. Maps of the spatial distribution of 8-13 micron color temperature and warm dust opacity derived from the multiwavelength images further characterize the IR emission. The remarkable flatness of the color temperature conflicts with the radial temperature gradient expected across a thick shell of material with a single heat source at its center. The new data suggest instead that the source consists of a central star surrounded by a dust shell that is too thin to provide a detectable temperature gradient and too small to permit the resolution of limb brightening.
Fazio Giacomo
Gezari Daniel Ysa
Hoffmann William F.
Jaye D.
Lamb Gerald M.
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