A New Analysis of the O VI Emitting Nebula around KPD 0005+5106

Details A New Analysis of the O VI Emitting Nebula around KPD 0005+5106 A New Analysis of the O VI Emitting Nebula around KPD 0005+5106

2009-06-25

arxiv.org/abs/0906.4759v2

Astrophys.J.701:481-487,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

21 pages, including 3 figures and 2 tables. Accepted for publication in the Astrophysical Journal. Minor change: a few uncited

Scientific paper

10.1088/0004-637X/701/1/481

We present observations of O VI 1032 emission around the helium white dwarf KPD 0005+5106 obtained with the Far Ultraviolet Spectroscopic Explorer. Previously published data, reprocessed with an updated version of the calibration pipeline, are included along with new observations. The recent upward revision of the white dwarf's effective temperature to 200,000 K has motivated us to re-analyze all the data. We compare observations with photoionization models and find that the density of the O VI nebula is about 10 cm^-3, and that the stellar flux must be attenuated by about 90% by the time it impinges on the inner face of the nebula. We infer that this attenuation is due to circumstellar material ejected by KPD 0005+5106 earlier in its evolution.

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