SIMBAD references

2005A&A...431..175S - Astronomy and Astrophysics, volume 431, 175-182 (2005/2-3)

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


Abstract (from CDS):

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 1200µm 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.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: planetary systems: protoplanetary disks - infrared: stars - techniques: spectroscopic - submillimeter

Simbad objects: 14

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