Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.2504w&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #25.04; Bulletin of the American Astronomical Society, Vol. 31, p.1409
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new high-dynamic-range images of circumstellar dust around HR 4796A that were obtained with MIRLIN at the Keck II telescope at 8.8, 10.3, 12.5 and 24.5 microns. We have also obtained a new continuum measurement at 350 microns with the Caltech Submillimeter Observatory. Emission is resolved in 12.5 and 24.5 micron images at 0.25'' and 0.4'' resolution, respectively, and confirms both the outer ring and the presence of a warm, tenuous, exo-zodiacal component of dust close to the star. The flux of unresolved emission at the stellar position (within a linear separation of 13 AU) was determined by fitting the central peak emission with an image of a nearby standard star imaged within a half hour of HR 4796A. Point source emission determined in this way is in excess of the photosphere by 59.1 +/-17.6 mJy at 12.5 microns and 258 +/-50.7 mJy at 24.5 microns, implying a color temperature of 163+/-17 K and radial distance of 11+/-3 AU. To refine this estimate, we are carrying out modeling which simultaneously fits mid-infrared images and continuum flux measurements with simulations generated by a model of an inner disk with an outer ring. Preliminary model-fitting to all data confirms the presence of an inner zodiacal dust component centered at a radial distance of approximately 9 AU from the star.
Backman Dana E.
Koerner David William
Ressler Michael E.
Serabyn Eugen
Wahhaj Zahed
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