FUSE Observation of the Ultramassive White Dwarf PG1658+441

Details FUSE Observation of the Ultramassive White Dwarf PG1658+441 FUSE Observation of the Ultramassive White Dwarf PG1658+441

2003-09-23

arxiv.org/abs/astro-ph/0309642v1

Astrophys.J.598:486-491,2003

Astronomy and Astrophysics

Astrophysics

17 pages, 4 figures

Scientific paper

10.1086/378719

We present an analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectrum of the ultramassive (M = 1.31 solar mass), magnetic (B_s = 2.3 MG) white dwarf PG 1658+441. The far ultraviolet (FUV) spectrum exhibits very broad Lyman lines and quasi-molecular Lyman beta satellites, but weak Lyman gamma satellites may also be present. PG 1658+441 is the hottest white dwarf known to show these satellite features. We fit the Lyman lines with stellar models and obtain atmospheric parameters consistent with a published analysis of the Balmer lines. By averaging results obtained for the different FUSE segments, we determine Teff = 29,620 +/- 500K and log g = 9.31 +/- 0.07. The models match the data over large portions of the spectrum but discrepancies remain near the satellite features. Finally, no trace elements have been identified in the FUV spectrum, and we provide abundance upper limits for C, N, Si, and P.

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