Diffuse Interstellar Bands in the spectrum of Zeta Persei. First detected in 1919 by Mary Heger.

Their origin is still mainly unknown, but it has been recently established that a few are caused by PAHs
The literature spectrum below shows the first bands detected

This image was used in the article 'Cracking an Interstellar Mystery' by Dr. M. McCabe published in
Astronomy & Geophysics (Journal of the RAS) Vol 60. August 2019

Details on image
2018-11-03 @ 20:19 UT