Astrophysics (index)about

B

(photometric filter for blue light)

B is commonly used to designate a blue passband or a corresponding filter. Without further qualification, B is most often intended to mean the blue passband/filter of the UBV photometric system, in which it is centered around wavelength 445 nm, with a width of 94 nm (full width at half maximum). This falls in the blue range of the spectrum, its width ranging from violet to green.

The letter is also used to indicate the magnitude of the signal observed through the filter, e.g., citing "b = 1.5".


(EMR,visible light,band,blue,photometry)
http://en.wikipedia.org/wiki/Photometric_system
WaveLFreqPhoton
Energy
  
445nm674THz2.8eVB

Referenced by:
Achernar
AD Leonis (AD Leo)
Algol (Beta Per)
Alpha Centauri
Arcturus
AU Microscopii (AU Mic)
Barnard's Star
Beta Centauri
Betelgeuse
Canopus
color-color diagram (CCD)
color index
color-period diagram
Epsilon Eridani
Epsilon Indi (ε Indi)
globular cluster luminosity function (GCLF)
Holmberg radius
HR 8799
Kapteyn's Star
Lacaille 9352
Lalande 21185
Luyten 726-8
passband
photometric system
Procyon
reddening
Rigel
Ross 154
Ross 248
sensitivity function (S)
Sirius
stellar radius determination
Sun
T Tauri
TW Hydrae (TW Hya)
UBV photometric system
Vega
Vega system
Wolf 359

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