Near-infrared spectrum of Epsilon Indi B

Near-infrared (0.9-2.5 µm) spectrum of Epsilon Indi B, obtained on November 16-17, 2002, with the SOFI multi-mode instrument on the ESO 3.5-m New Technology Telescope (NTT) at the La Silla Observatory (Chile) The total integration time is 360 sec. Regions of strong absorption in the Earth's atmosphere have been removed for clarity. The locations of prominent molecular absorption bands from water (H2O), methane (CH4) and carbon monoxide (CO) in the atmosphere of Epsilon Indi B are indicated. Also labelled are some spectral lines from potassium (KI, at 1.25 and 1.52 µm) and sodium (NaI, at 2.33 µm) atoms. From these data, the spectral type of Epsilon Indi B is determined as T2.5V, corresponding to an effective temperature of 'just' 1000 ± 60 °C.

Crediti:

ESO/R.-D.Scholz et al. (AIP)

A proposito dell'immagine

Identificazione:eso0303b
Tipo:Osservazione
Data di pubblicazione:13 Gennaio 2003
Notizie relative:eso0303
Dimensione:2200 x 1574 px

A proposito delll'oggetto

Nome:Epsilon Indi B
Tipo:Milky Way : Star : Type : Brown Dwarf
Categoria:Stars

Formati delle immagini

JPEG grande
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Colori e filtri

BandaTelescopio
Infrarosso
Near-IR
New Technology Telescope
SOFI