### monochromatic luminosity

(luminosity at a specific wavelength)

**Monochromatic luminosity** can be thought of as
an astronomical object's total power output at
a specific wavelength or frequency.
(An interval of the spectrum of zero width will have zero
power, but integrating the monochromatic luminosity
over a finite interval yields the finite power over that interval.)
The power output over all wavelengths is termed the
bolometric luminosity and is often what is meant
by (plain) luminosity.

It is of note that an object's monochromatic luminosity per wavelength and
that per frequency differ at the same point on the object's spectrum,
the same curiosity as occurs with specific intensity.
The relation between them is:

L_{f }dL_{f} = L_{w} dL_{w}

- L
_{w} - monochromatic luminosity per wavelength.
- L
_{f} - monochromatic luminosity per frequency.
- dL
_{w} and dL_{f} - their differentials.

(*EMR,luminosity,measure*)
**Further reading:**

http://burro.cwru.edu/Academics/Astr221/Light/blackbody.html

**Referenced by page:**

luminosity (L)

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