Towards a standardised line list for G191-B2B, and other DA type objects

TL;DR

This paper analyzes the far UV spectrum of G191-B2B to identify spectral lines, reaffirming previous identifications and attributing many unidentified lines to metals, aiming to standardize line lists for DA white dwarfs.

Contribution

It provides a comprehensive UV spectral analysis of G191-B2B, attributing unidentified lines to metals and proposing a standardized line list for DA type objects.

Findings

Many previously unidentified lines are now attributed to Fe, Ni, and lighter metals.

Reaffirmed earlier spectral line identifications for G191-B2B.

Lays groundwork for extending analysis to other DA white dwarfs.

Abstract

We present a comprehensive analysis of the far UV spectrum of G191-B2B over the range of 900-1700{\AA} using co-added data from the FUSE and STIS archives. While previous identifications made by Holberg et al. (2003) are reaffirmed in this work, it is found that many previously unidentified lines can now be attributed to Fe, Ni, and a few lighter metals. Future work includes extending this detailed analysis to a wider range of DA objects, in the expectation that a more complete analysis of their atmospheres can be realised.