Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...487l.151f&link_type=abstract
Astrophysical Journal Letters v.487, p.L151
Astronomy and Astrophysics
Astronomy
11
Stars: Circumstellar Matter, Stars: Individual Constellation Name: Alpha Piscis Austrini, Ism: Dust, Extinction, Infrared: Stars, Stars: Early-Type
Scientific paper
We mapped 60 mu m emission around five Vega-type systems. We utilized the PHOT-C100 far-infrared array camera on board the Infrared Space Observatory. The spatial resolution of the maps is ~30". The maps of three sources ( alpha CrB, sigma Her, and alpha Cen) do not show any evidence of extended emission. The map of gamma Oph shows marginal hints of extended emission ~30" (800 AU) from the star. The map of alpha PsA shows extended emission ~30"--80" (~210--560 AU) from the star. This location, together with alpha PsA's characteristic IRAS temperature of 58--75 K, suggest the observed dust grains around alpha PsA are up to ~10 mu m in size. We estimate the mass of dust grains emitting the IRAS 60 mu m excess of alpha PsA to be ~(2--6) x10^{-3} M_⊕ .
Backman Dana E.
Fajardo-Acosta Sergio Bernabe
Stencel Robert E.
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