Discovery of new candidate vega-type systems from IRAS and the 2 micron all-sky survey

We obtained J (1.25 mu m), H (1.65 mu m), and K, (2.17 mu m) photometry fro m the 2 Micron All-Sky Survey and 12, 25, 60, and 100 mu m photometry from the IRAS Faint Source Catalog of 2834 field stars. We identified in this sa mple 296 main-sequence (luminosity class IV TV-V, or V) stars. We searched the sample of main-sequence stars for excess 12 mu m emission with respect to J, H, and K, photospheric emission. We discovered eight systems with 12 mu m excess emission newly reported here. These excesses are likely to be f rom Vega-type circumstellar dust, but small-aperture photometry is needed t o confirm their nature. Preliminary models that assume the excesses are cir cumstellar show the dust to be located similar to 1-10 AU from the stars, w here it is heated to "terrestrial" temperatures, similar to 200-500 K. Cold er dust might also exist in the systems but below the IRAS sensitivity limi t. The exception is HD 93331 (B9.5 V), previously known for its IRAS far-in frared excess.