Infrared Mapping of the dust disc around Vega ?
نویسندگان
چکیده
Accepted Received ABSTRACT ISOPHOT was used to perform high resolution 60m scans of Vega, and these were compared with those from Dra, to obtain a Gaussian width of 22 00 2 00. The dust disc around Vega was mapped, resolving it at 60m and 90m with ISOPHOT. At 90m a Gaussian width of 36 00 3 00 was derived. In addition multi-lter photometry is The data are tted by a modiied blackbody with a temperature of 73K (Q() / 1== 1:1). The dust disc has a luminosity L IR /L 3 10 ?5. Using a distance of 7.8 parsec, 22 00 corresponds to a distance of 86AU, and 36 00 to 140AU.
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