sky background subtraction

Forums Variable Stars PNV J00425895+4126279 sky background subtraction

Robin Leadbeater

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