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Baldovin-Saavedra, C; Audard, M; Carmona, A; Guedel, M; Briggs, K; Rebull, L M; Skinner, S L; Ercolano, B
Astronomy and astrophysics (Berlin), 07/2012, Letnik: 543Journal Article
The Ne II line 12.81 mu m was proposed to be a good tracer of gas in the environments of proto-planetary disks; its origin is explained by different mechanisms: jets in outflows, photo-evaporative disk winds driven by stellar X-rays/EUV or by the X-ray irradiated proto-planetary disk atmosphere. The authors obtained high-resolution ground-based observations with VISIR-VLT for 15 stars and UVES-VLT for three of them. The stars were chosen for having bright neon emission lines detected with Spitzer/IRS. The velocity shifts and profiles are used to disentangle the different emitting mechanisms producing the Ne II line. A comparison between results from this study and previous high-resolution studies is also presented. The Ne II line was detected in seven stars, among them the first confirmed detection of Ne II in a Herbig Be star, V892 Tau. In four cases, the large blueshifted lines indicate an origin in a jet. In two stars, the small shifts and asymmetric profiles indicate an origin in a photo-evaporative wind.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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