Mid-IR observations of circumstellar disks. II. Vega-type stars and a post-main sequence object

Details Mid-IR observations of circumstellar disks. II. Vega-type stars and a post-main sequence object Mid-IR observations of circumstellar disks. II. Vega-type stars and a post-main sequence object

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...431..175s&link_type=abstract

Astronomy and Astrophysics, v.431, p.175-182 (2005)

Astronomy and Astrophysics

Astrophysics

20

Stars: Circumstellar Matter, Stars: Planetary Systems: Protoplanetary Disks, Infrared: Stars, Techniques: Spectroscopic, Submillimeter

Scientific paper

We present spectral energy distributions and new N-band photometry and spectroscopy for a sample of six main sequence stars and one post-MS object using the ESO TIMMI2 camera at La Silla observatory (Chile). All objects are thought to possess circumstellar material and for the majority of the targets this is their first N-band spectroscopic observation. The emission spectra (observed in three cases), modelled with a mixture of silicates consisting of different grain sizes and composition, confirm the suspected presence of disks around these targets. The most important discovery is that HD 113766, a young Vega-type star, is host to highly processed dust which is probably second generation. It is the first time a Vega-type star with such highly evolved dust has been observed. Silicate emission of basically unevolved dust is seen in case of the post-MS object HD 41511 and the Vega-type star HD 172555. In addition, to study the cold dust, we observed a subsample at 1200 μm with the bolometer array SIMBA at the SEST in La Silla but we only got upper limits for those five objects. This shows that these Vega-type stars have a smaller amount of dust than their precursors, the T Tauri and Herbig Ae/Be stars.
Based on observations collected at the European Southern Observatory, La Silla, Chile (70.C-0468, 71.C-0001).

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