Astrophysics (Index)About

Strömgren photometric system

(uvby system, uvby photometric system)
(four-color photometric system devised in 1950s)

The Strömgren photometric system is a four-passband photometric system devised by astronomer Bengt Strömgren. It is considered a medium-band photometric system, using somewhat-narrower bands but covering the same general range as the UBV photometric system, covering visible light and some ultraviolet.


designator stands for peak
full width at half maximum
u "ultraviolet" 350 nm 30 nm
v "violet" 411 nm 19 nm
b "blue" 467 nm 18 nm
y "yellow" 547 nm 23 nm

Since its development, additions have been devised.

Further reading:ömgren_photometric_system