What stars are called infrared?

In principle, any star has infrared radiation, but in astronomy, infrared stars are understood as stars that emit the bulk of their energy in the range of 0.74 – 2 micrometers. Most of the found IR stars belong to long-period variable stars with temperatures of 1500 – 3000 K. However, there are IR stars emitting in the far infrared region (n> 4 μm). It is assumed that the gas-dust envelope surrounding the star is responsible for such radiation.

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