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1\31 Spain - The William Herschel Telescope finds the best candidate for a
supernova explosion
Part 2 of 2

GLOSSARY 

Echelle spectrograph. A spectrograph is an instrument for
obtaining a record of the component colours, or wavelengths
of light from stars. The most familiar example of a spectrum
is the natural rainbow, which occurs when sunlight is
dispersed into its component colours by the combined
prism-like action of raindrops. 

An echelle spectrograph employs a carefully designed
combination of optical components (gratings, prisms,
mirrors and lenses) to separate the light in many different
wavelengths at high resolution while at the same time
ensuring that a large portion of the starlight can still
be detected. 

Light-year. The distance travelled through a vacuum by
light in one year. A light year is equivalent to
9.4607 x 10**12 kilometres.

Picture credit: Paul Langford.

Available formats:

* JPEG 1000x739 pixels (320 K)
  http://www.ing.iac.es/PR/press/whteye.jpg
* TIFF 2130x1574 pixels, 18.0x13.3 cm at 300 dpi (9.3 M)
  http://www.ing.iac.es/PR/press/whteye.tif

[Image 4]
Caption: The William Herschel Telescope, the most powerful
optical/infrared telescope in Europe.

Picture credit: Nik Szymanek.

Available formats:

* JPEG 1000x934 pixels (246 K)
  http://www.ing.iac.es/PR/press/2002wht6.jpg
* TIFF 2133x1585 pixels, 18.1x13.4 cm at 300 dpi (9.7 M)
  http://www.ing.iac.es/PR/press/2002wht6.tif

-- 
Andrew Yee
ayee{at}nova.astro.utoronto.ca

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