(set of related, closely-packed spectral lines)
The term spectral band can be used in a general way
to indicate a contiguous set (interval) of spectral
wavelengths. It is often shortened to the term band.
A common use is to describe the wavelength-range of filters
Spectral band is also used assuming a more specific meaning:
such an interval of wavelengths that are affected by
a molecule, often a large, complex molecule,
that produces many spectral lines, often forming a
closely-packed pattern, even to the point of overlapping.
If they overlap or if the spectroscope's
resolution is low, it is seen as a
range of absorption (absorption band) or
emission (emission band).
Polycyclic aromatic hydrocarbons produce these, e.g., PAH emissions.
Water lines are another example.
Referenced by pages:
Breakthrough Listen (BL)
color-magnitude diagram (CMD)
chemically peculiar star (CP star)
diffuse interstellar bands (DIBs)
Green Bank Telescope (GBT)
high-energy astrophysics (HEA)
high frequency (HF)
imaging Fourier transform spectroscopy (IFTS)
interstellar medium (ISM)
mid infrared (MIR)
near infrared (NIR)
precipitable water vapor (PWV)
radio frequency interference (RFI)
S-type star (S)