Silicate Emission in the TW Hydrae Association
Abstract
The TW Hydrae association is the nearest young stellar association. Among its members are HD 98800, HR 4796A, and TW Hydrae itself, the nearest known classical T Tauri star. We have observed these three stars spectroscopically between 3 and 13 μm. In TW Hya, the spectrum shows a silicate emission feature that is similar to many other young stars' with protostellar disks. The 11.2 μm feature indicative of significant amounts of crystalline olivine is not as strong as in some young stars and solar system comets. In HR 4796A, the thermal emission in the silicate feature is very weak, suggesting little in the way of (small silicate) grains near the star. The silicate band of HD 98800 (observed by us, but also reported by Sylvester & Skinner) is intermediate in strength between TW Hya and HR 4796A.
- Publication:
-
The Astronomical Journal
- Pub Date:
- November 2000
- DOI:
- 10.1086/316831
- arXiv:
- arXiv:astro-ph/0008025
- Bibcode:
- 2000AJ....120.2609S
- Keywords:
-
- Stars: Individual: Constellation Name: TW Hydrae;
- stars: individual (HR 4796A);
- Stars: Individual: Henry Draper Number: HD 98800;
- Stars: Pre-Main-Sequence;
- Techniques: Spectroscopic;
- Astrophysics
- E-Print:
- 22 pages, 11 figures, LaTeX2e and AAS LaTeX macros v5.0. Accepted for publication in AJ