A high resolution spectral atlas of brown dwarfs

Details A high resolution spectral atlas of brown dwarfs A high resolution spectral atlas of brown dwarfs

2007-07-18

arxiv.org/abs/0707.2652v1

Astronomy and Astrophysics

Astrophysics

17 pages, 11 figures, accepted by A&A, reduced figure quality for arXiv

Scientific paper

10.1051/0004-6361:20077963

We present a UVES/VLT high resolution atlas of three L dwarfs and one T dwarf system, spectral classes at which most of the objects are brown dwarfs. Our atlas covers the optical region from H$\alpha$ up to the near infrared at 1 $\mu$m. We present spectral details of ultra-cool atmospheres at very high resolution ($R \sim 33 000$) and compare the spectra to model calculations. Our comparison shows that molecular features from VO and CaH, and atomic features from Cs and Rb are reasonably well fit by current models. On the other hand, features due to TiO, CrH, and water, and atomic Na and K reveal large discrepancies between model calculations and our observations.

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