The High-Resolution Spectrum of the Pulsating, Pre-White Dwarf Star PG 1159-035 (GW Vir)
Husfeld, D.; Sion, E. M.; Wesemael, F.; Liebert, James; Wehrse, R.; Starrfield, S. G.
United States, Canada, Germany
Abstract
High-resolution and low-resolution UV spectra and a high-resolution optical spectrum were obtained for PG 1159-035, revealing apparent photospheric absorption features with defined cores from N V 1240 A, N IV 1270 A, O V 1371 A, and C IV 1550 A. The photospheric velocity derived using all of these lines except for C IV is about +35 km/s. Equivalent-width measurements determined for all of the features may provide a tighter constraint on the photospheric temperature in a detailed model atmosphere analysis treating the CNO ions.