Home › Forums › Variable Stars › PNV J00425895+4126279 › sky background subtraction
12 September 2017 at 4:41 pm #578555
Attached are the spectra with and without sky background subtraction, (pink and blue respectively, to the same Y scale).
The strongest emission line is the O I airglow line at 5577A. There is also O I emission at 6300A and Na D emission (light pollution ?) at 5900A