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Silicate dust in a Vega-excess system

SKINNER, CJ; BARLOW, MJ; JUSTTANONT, K; (1992) Silicate dust in a Vega-excess system. Monthly Notices of the Royal Astronomical Society , 255 (3) P31-P36. 10.1093/mnras/255.1.31P. Green open access

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Abstract

The 10-µm spectrum of the K5V star SAO 179815 ( = HD 98800) is presented, and conclusively demonstrates the presence of small silicate dust grains (probably in a disc) around this star. The 9.7-µm silicate dust feature is unusually broad and shallow in this system. This, together with the slow fall-off of flux at longer wavelengths, constrains the size and density distributions of dust grains in models of the disc. We find that there must be a significant population of small grains (radii at least as small as 0.01 µm), as well as a population of large grains (radii at least as large as 100 µm) in order to explain all the observed properties of the disc.

Type: Article
Title: Silicate dust in a Vega-excess system
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/255.1.31P
Publisher version: https://doi.org/10.1093/mnras/255.1.31P
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: circumstellar matter, stars: individual: SAO 179815, dust, extinction, infrared: stars
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096203
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