Optical spectrum of brown dwarf TWA-5B

This optical spectrum (600 - 900 nm wavelength range) of TWA-5 B was obtained with the FORS-2 instrument at the 8.2-m VLT/KUEYEN telescope on 23 February 2000. A 30-min exposure was made through a 0.7 arcsec wide slit, positioned on the object in east-west direction, i.e., perpendicular to the direction to the much brighter TWA-5 A, only 2 arcsec to the south, see ESO Press Photo eso0023. Thanks to this, the obtained spectrum was very "clean". Also shown is the optical spectrum of a typical M9-type star. The spectra are very similar, with broad molecular absorption bands from TiO and VO. TWA-5 B also shows strong hydrogen emission (H-alpha) and weak sodium (Na) absorption, both indicative of its comparatively young age.

Källa:

ESO

Om bilden

ID:eso0023b
Typ:Diagram
Publiceringsdatum:21 juli 2000
Relaterade pressmeddelanden:eso0023
Storlek:1017 x 690 px

Om objektet

Namn:TWA-5 B
Typ:Milky Way : Star : Type : Brown Dwarf
Kategori:Illustrations
Stars

Bildformat

Originalstorlek
257,1 kB
Stor jpeg
121,7 kB
Skärmstor jpeg
107,7 kB

Färger och filter

BandTeleskop
Synligt ljusVery Large Telescope
FORS2