description Sharpless 2-140 Overview
Sharpless 2-140, also known as S140, is an emission nebula and H II region in the constellation Cepheus, associated with the molecular cloud L1204. Its visible glow comes from gas ionized by young hot stars, while observations at infrared and radio wavelengths examine embedded objects and the surrounding star-forming material. The region is used in studies of clustered and massive-star formation.
help Sharpless 2-140 FAQ
What is Sharpless 2-140?
Sharpless 2-140, also called S140, is an emission nebula and H II region in the constellation Cepheus. It is associated with the molecular cloud L1204.
Why does Sharpless 2-140 glow?
Its visible light comes from gas ionized by young, hot stars. The ionized hydrogen produces the characteristic glow seen in emission nebulae.
What can infrared observations reveal about S140?
Infrared observations can detect embedded young stars and warm dust hidden by visible dust. Radio observations also help astronomers study the molecular gas in the L1204 cloud.
Is Sharpless 2-140 a planetary nebula?
No. S140 is a star-forming H II region, not the shell expelled by a dying low- or intermediate-mass star. Its environment is linked to young stars and molecular cloud material.
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