Astrophysics (Index)About

spectroscopy

(measurement of light with various 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 velocity. Spectrography is virtually the same study.

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 an extremely-low-resolution spectroscopy, studying stars and astronomical bodies based upon just a few passbands. Its advantage is that it requires much less electromagnetic radiation, thus can be used for more distant objects, and is also multi-object by default.

Some instrument terms/classes:

Intensity at each wavelength is typically the quality of interest but there are also cases when polarization at each wavelength is the quality of interest.


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

Referenced by pages:
absorption
abundances
Bcool
Baryon Oscillation Spectroscopic Survey (BOSS)
cavity-enhanced absorption spectroscopy (CEAS)
methylidyne (CH)
Chandra X-ray Observatory (CXO)
color index
cryogenic spectroscopy
Carnegie Supernova Project (CSP)
Lowell Discovery Telescope (LDT)
differential spectroscopy
velocity dispersion (σ)
earthshine
exoplanet eclipse light curve
electron shell
emission
ESO Nearby Abell Cluster Survey (ENACS)
exosatellite
FINESSE
51 Eridani b
forward model
Gaia
GAMA
Gemini Observatory
ground state
Gran Telescopio Canarias (GTC)
H-alpha (Ha)
HBK
HCI
NEWS
HRS
imaging Fourier transform spectroscopy (IFTS)
integral field unit (IFU)
imaging spectrometer
integral field spectrograph
IRAS
Kirchhoff's laws
LAMOST
line blanketing
Multi-Epoch Nearby Cluster Survey (MENeaCS)
Mimir
neutron scattering
NICER
Nearby Supernova Factory (NSNF)
photometry
radioactive decay
relativistic effect
Rossiter-McLaughlin effect (RM effect)
radial velocity method
Supernova Cosmology Project (SCP)
secondary eclipse
signatures of formation
chromospheric activity index
6dF Galaxy Survey (6dFGS)
spectral line designation
spectrography
spectrometry
SPICA
stellar parameter determination
stellar temperature determination
synthetic photometry
telluric star
transit spectroscopy
transmission spectroscopy
2dF Galaxy Redshift Survey (2dFGRS)
VLT-FLAMES Tarantula Survey (VFTS)
James Webb Space Telescope (JWST)
William Herschel Telescope (WHT)
XMM-Newton

Index