Astrophysics (index)

Spectroscopy

(measurement of the strengths of different electromagnetic wavelengths)

Spectroscopy (or Spectrometry) is the study of radiation intensity as a function of Wavelength. It is the method for determining the chemical composition of astronomical bodies as well as Temperature and radial motion. Spectrography is virtually the same study but implies the use of a spectrographic image, displaying the spectrum across its width.

Instruments operating at or near Visible Light typically use prisms or Gratings that angle light according to wavelength (Dispersion). Dispersion with prisms is small so often multiple prisms are used in tandem, e.g., a Triple Prism Spectrograph.

Photometry is like a very-low-Spectral Resolution (R) spectroscopy, studying stars and astronomical bodies based upon just a few Passbands. Its advantage is that it requires much less Electromagnetic Radiation (EMR), thus can be used for more distant objects.

Some instrument terms/classes:

Intensity at each wavelength is typically the item of interest but there are also cases when Polarization at each wavelength if the item of interest.


(science,measurement,astronomy,color,EMR)
http://en.wikipedia.org/wiki/Spectroscopy

Referenced by:
Absorption
Abundances
Bcool
Methylidyne (CH)
Chandra X-ray Observatory (Chandra)
Color Index
Discovery Channel Telescope (DCT)
Velocity Dispersion (σ)
Exoplanet Eclipse Light Curve
Emission
Exosatellite
Gemini Observatory
Gran Telescopio Canarias (GTC)
HCI
NEWS
Imaging Fourier Transform Spectroscopy (IFTS)
Imaging Spectrometer
Integral Field Spectrograph
Kirchhoff's Laws
LAMOST
Mimir
Photometry
Spectrography
Spectrometry
Stellar Parameter Determination
Stellar Temperature Determination
Synthetic Photometry
Transmission Spectroscopy
2dF Galaxy Redshift Survey (2dFGRS)
James Webb Space Telescope (JWST)
William Herschel Telescope (WHT)
XMM-Newton

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