An Etymological Dictionary of Astronomy and Astrophysics

A spectral feature at 9850-10200 Å appearing in the spectrum of some late-type → M dwarfs. It is attributed to iron hybrid (FeH), a typical signature of the atmospheres of the coolest stars.

See also: First detected by R. F. Wing and W. K. Ford (1969, PASP 81, 527); → band.