Infrared mapping of the dust disc around VEGA

Details Infrared mapping of the dust disc around VEGA Infrared mapping of the dust disc around VEGA

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.293l..78h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 293, p. L78-L82

Astronomy and Astrophysics

Astronomy

27

Infrared Astronomy, A Stars, Stellar Envelopes, Infrared Stars, Stellar Spectrophotometry, Cosmic Dust, Infrared Photometry, Astronomical Maps

Scientific paper

ISOPHOT was used to perform high-resolution 60-microns scans of Vega, and these have been compared with those from Gamma Dra, to obtain a Gaussian width of 22 +/- 2 arcsec. The dust disk around Vega was mapped, and it was resolved at 60 and 90 microns with ISOPHOT. At 90 microns a Gaussian width of 36 +/- 3 arcsec is derived. In addition, multifilter photometry at 25, 60, 80, 100, 120, 150, 170 and 200 microns is presented. The data are fitted by a modified blackbody with a temperature of 73 K (Q(lambda) varies as 1/lambda exp 1.1). The dust disk has a luminosity of about 3 x 10 exp -5. Using a distance of 7.8 pc, 22 arcsec corresponds to a distance of 86 AU, and 36 arcsec to a distance of 140 AU.

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