Computer Science
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.482...69f&link_type=abstract
ISOPHOT: Proceedings of the Workshoip on P32 Oversampled Mapping, held in Madrid, Spain and Pasadena, CA, USA in February and Ma
Computer Science
Iso, Circumstellar Matter, Dust, Extinction, Infrared
Scientific paper
This work investigates far-infrared (60 m) mapping tech- niques of extended emission, in the form of a circumstellar dust disk, of the main-sequence star α PsA. The direct detection of a disk in this system has advanced our understanding of the Vega phenomenon. The analyzed data consist of 60 μm maps with the PHOT C-100 3×3-pixel far-infrared camera on-board the Infrared Space Observatory (ISO), in the P32 microscanning dedicated mapping mode. The spatial resolution of the maps is ~30 arcsec. A comparison of the map of αPsA with a similar map of the star αBoo, which does not possess circumstellar dust, is presented. The basic technique is to model a point- spread function (PSF) from the latter, and to subtract it from the Vega-type stellar map. The P32Tools algorithm for mod- elling and correction of transients in P32 maps was applied to both maps in this work. The aim was to check on the reality of previously reported detection of the disk of αPsA in P32 mapping. The P32Tools results confirm αPsA shows extended emission as far as ~700 AU from the star. Therefore, the pre- viously reported detections are not an artifact from PHOT de- tector transients.
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