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Astron. Astrophys. 315, L233-L236 (1996)

First results from a photometric infrared survey for Vega-like disksaround nearby main-sequence stars*

H.J. Habing1, P. Bouchet2, C. Dominik1, Th. Encrenaz3, A. Heske4, M. Jourdain de Muizon3,5, M.F. Kessler4, R. Laureijs4, K. Leech4, L. Metcalfe4, A. Salama4, R. Siebenmorgen4, N. Trams4, C. Waelkens6, and L.B.F.M. Waters7,8

1 Sterrewacht, Leiden, P.O. Box 9513, 2300 RA Leiden, The Netherlands
2 European Southern Observatory, Casilla 19001, Santiago 19, Chile
3 DESPA, Observatoire de Paris, F-92190 Meudon, France
4 ISO Science Operations Center, Astrophysics Division of ESA, Vilspa, PO Box 50727, E-28080 Madrid, Spain
5 LAEFF-INTA, ESA Vilspa, PO Box 50727, E-28080 Madrid, Spain
6 C. Waelkens, Instituut voor Sterrenkunde KU Leuven, Celestijnenlaan 200B, B-3001 Heverlee, Belgium
7 Astronomical Institute ``Anton Pannekoek'', University Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
8 SRON Laboratory for Space Research Groningen, PO Box 800, 9700 AV Groningen, The Netherlands

Received 30 July 1996 / Accepted 15 August 1996

Abstract. We have undertaken a survey for Vega-like disks around nearby main-sequence stars by making photometric measurements with ISOPHOT at four wavelengths between 25 and 180  img1.gifm. Our goal is to establish how common Vega-like disks are, and how their presence depends on the fundamental properties of main-sequence stars (mass, age, rotation etc.). Here we present first results that concern Vega itself and g Lup. We confirm the results obtained by IRAS and give new fluxes at 135 and 180  img1.gifm. We also present a first table of measurements on a larger sample. Vega-like disks are common, but not a general feature of all main-sequence stars with masses above 0.9 img2.gif .

Key words: stars: planetary systems - stars: general - stars: individual: Vega, g Lup - infrared: stars

* Based on observations with ISO, 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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