A high resolution spectral atlas of brown dwarfs
نویسندگان
چکیده
منابع مشابه
A high resolution spectral atlas of brown dwarfs
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 Hα up to the near infrared at 1 μm. We present spectral details of ultra-cool atmospheres at very high resolution (R ∼ 33 000) and compare the spectra to model calculations. Our comparison shows that molecu...
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On 3 and 4 October, 1995, we obtained high spectral resolving power (R= λ/∆λ = 60, 000) observations of comet 122P/de Vico using the 2DCoude cross-dispersed echelle spectrograph on the 2.7-m telescope of McDonald Observatory. The spectra cover the wavelength range from 3830Å– 10192Å. The spectra from 3830–5776Å are continuous; from 5777–10192Å there are increasing interorder gaps. The comet was...
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Models of brown dwarf atmospheres suggest they exhibit complex physical behaviour. Observations have shown that they are indeed dynamic, displaying small photometric variations over timescales of hours. Here I report results of infrared (0.95–1.64 µm) spectrophotometric monitoring of four field L and T dwarfs spanning timescales of 0.1–5.5 hrs, the goal being to learn more about the physical na...
متن کاملCorrelated spectral variability in brown dwarfs
Models of brown dwarf atmospheres suggest they exhibit complex physical behaviour. Observations have shown that they are indeed dynamic, displaying small photometric variations over timescales of hours [1][3][5][6][7]. v sin i observations obtained with UVES on the VLT have shown that brown dwarfs are rapid rotators, with rotation periods of 3–10 hours [2], yet I have also demonstrated that the...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20077963