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Spatially Resolving the Inner Disk of TW Hydrae
We present Keck Interferometer observations of TW Hya that spatiallyresolve its emission at 2 μm wavelength. Analyzing these datatogether with existing K-band veiling and near-infrared photometricmeasurements, we conclude that the inner disk consists of opticallythin, submicron-sized dust extending from ~4 AU to within 0.06 AU of thecentral star. The inner disk edge may be magnetospherically truncated.Even if we account for the presence of gas in the inner disk, thesesmall dust grains have survival times against radiation blowout that areorders of magnitude shorter than the age of the system, suggestingcontinual replenishment through collisions of larger bodies.
| A catalog of far-ultraviolet point sources detected with the fast FAUST Telescope on ATLAS-1
We list the photometric measurements of point sources made by the FarUltraviolet Space Telescope (FAUST) when it flew on the ATLAS-1 spaceshuttle mission. The list contains 4698 Galactic and extragalacticobjects detected in 22 wide-field images of the sky. At the locationssurveyed, this catalog reaches a limiting magnitude approximately afactor of 10 fainter than the previous UV all-sky survey, TDl. Thecatalog limit is approximately 1 x 10-14 ergs A sq cm/s,although it is not complete to this level. We list for each object theposition, FUV flux, the error in flux, and where possible anidentification from catalogs of nearby stars and galaxies. Thesecatalogs include the Michigan HD (MHD) and HD, SAO, the HIPPARCOS InputCatalog, the Position and Proper Motion Catalog, the TD1 Catalog, theMcCook and Sion Catalog of white dwarfs, and the RC3 Catalog ofGalaxies. We identify 2239 FAUST sources with objects in the stellarcatalogs and 172 with galaxies in the RC3 catalog. We estimate thenumber of sources with incorrect identifications to be less than 2%.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Kupa |
| Sað Açýklýk: | 11h15m42.59s |
| Yükselim: | -22°54'57.5" |
| Görünürdeki Parlaklýk: | 7.067 |
| Uzaklýk: | 84.459 parsek |
| özdevim Sað Açýklýk: | -80.8 |
| özdevim Yükselim: | 24.3 |
| B-T magnitude: | 7.33 |
| V-T magnitude: | 7.089 |
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