A 25 micron search for Vega-like disks around main-sequence stars with ISO

Details A 25 micron search for Vega-like disks around main-sequence stars with ISO A 25 micron search for Vega-like disks around main-sequence stars with ISO

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...387..285l&link_type=abstract

Astronomy and Astrophysics, v.387, p.285-293 (2002)

Astronomy and Astrophysics

Astrophysics

44

Stars: Planetary Systems, Stars: General, Infrared: Stars

Scientific paper

We present an ISO 25 mu m photometric survey of a sample of 81 nearby main-sequence stars in order to determine the incidence of ``warm'' dust disks. All stars were detected by ISO. We used an empirical relation to estimate the photospheric flux of the stars at 25 mu m. We find 5 stars (6%) with excess above the photospheric flux which we attribute to a Vega-like disk. These stars show disk temperatures not warmer than 120 K. Our study indicates that warm disks are relatively rare. Not a single star in our sample older than 400 Myr has a warm disk. We find an upper limit of Mdisk = 2x 10-5 Moplus for the mass of the disks which we did not detect. ISO is an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

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