Description
We present high resolution archive spectra of four white dwarfs taken over a period of 25 years. The observations were taken with ESOs Ultraviolet and Visual Echelle Spectrograph (UVES) and there are between 400 and 625 spectra per wavelength setting per star. The primary aims of the study are to search for changes in interstellar lines and those in the Earth's atmosphere as a function of epoch, but the same observations may also be used to search for metal lines in the WDs and their possible variation.
Author
Jonathan Smoker
(Very Large Telesope, European Southern Observatory)
