Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.1910f&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #19.10; Bulletin of the American Astronomical Society, Vol. 28, p.1300
Astronomy and Astrophysics
Astronomy
Scientific paper
We mapped 60 mu m emission around 5 Vega-type systems. We utilized the PHT-C100 3x3-pixel far-infrared camera on-board ISO, in the P32 microscanning dedicated mapping mode. The maps are centered on the stars and span 6'15''x5'45'' (RAxDEC), at a spatial resolution of 15''. The maps of 3 sources (alpha CrB, sigma Her, and alpha CenB) do not show any evidence of extended emission when compared to a model point-spread function obtained from a similar map of alpha Boo. The map of gamma Oph possibly shows extended emission ~ 30'' from the star, slightly above the background noise ( ~ 4 MJy/sr). The map of alpha PsA shows extended emission features ~ 30--80'' from the star. The extended emission peak brightness in alpha PsA, after background subtraction, is ~ 13 MJy/sr, or ~ 4sigma , above the background noise. The S/N of our mapping observations is not high but as a preliminary result we estimate some physical parameters of the 60 mu m emitting dust around alpha PsA. The innermost ~ 30'' or ~ 210 AU from the star are relatively dust-depleted. The dust is found between ~ 210 AU and ~ 560 AU from the star, with peak 60 mu m emission located at ~ 320 AU. We take the latter as a characteristic location of the emitting dust. This location, together with a characteristic IRAS temperature of 72 K (Backman & Paresce 1993, Protostars and Planets III, ed. Levy & Lunine, 1253), suggests the observed dust grains are ~ 1.5 mu m in size. The mass of these grains emitting the total extended emission of ~ 11.9 Jy across ~ 3.4 x 10(3) arcsec(2) is ~ 3 x 10(-3) M_⊕.
Backman Dana E.
Fajardo-Acosta Sergio Bernabe
Stencel Robert E.
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