Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...520..215f&link_type=abstract
The Astrophysical Journal, Volume 520, Issue 1, pp. 215-222.
Astronomy and Astrophysics
Astronomy
25
Stars: Circumstellar Matter, Ism: Dust, Extinction, Infrared: Stars
Scientific paper
We obtained 3.6-20 μm photometry of 38 bright [IRAS F_nu(12 μm)>0.7 Jy] main-sequence stars with the Infrared Space Observatory (ISO). Observations were conducted with the ISOPHOT instrument, in the single-pointing photometry mode, through filters at 3.6, 11.5, and 20.0 mum. We searched for excess (Vega-type) emission from dust at temperatures >~100 K, located at ~1-60 AU from the stars. We thus sampled dust at warm, terrestrial material temperatures and at cool (~100 K) temperatures of possible Kuiper Belt-type regions in these systems. We detected 20 μm excesses from ~14% of our sources, but we did not detect 11.5 μm excesses from any of them. We present single-temperature blackbody models of the location and density of dust emission around 10 stars, two of them (29 Cyg and Gl 816) with excesses newly reported here. We make a thorough comparison of ISO and IRAS data on our target stars and propose a new calibration procedure for ISOPHOT staring measurements at 3.6, 11.5, and 20 mum.
Backman Dana E.
Fajardo-Acosta Sergio Bernabe
Stencel Robert E.
Thakur Nagesh
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