A Far-UV Spectroscopic Analysis of the Central Star of the Planetary Nebula Longmore 1

Details A Far-UV Spectroscopic Analysis of the Central Star of the Planetary Nebula Longmore 1 A Far-UV Spectroscopic Analysis of the Central Star of the Planetary Nebula Longmore 1

2004-02-26

arxiv.org/abs/astro-ph/0402653v1

Astronomy and Astrophysics

Astrophysics

14 pages, 4 color figures. Accepted for publication in PASP

Scientific paper

10.1086/386380

We have performed a non-LTE spectroscopic analysis using far-UV and UV data of the central star of the planetary nebula K1-26 (Longmore 1), and found Teff = 120+/-10 kK, logg = 6.7 +0.3/-0.7, and y = 0.10. The temperature is significantly hotter than previous results based on optical line analyses, highlighting the importance of analyzing the spectra of such hot objects at shorter wavelengths. The spectra show metal lines (from, e.g, carbon, oxygen, sulfur, and iron). The signatures of most elements can be fit adequately using solar abundances, confirming the classification of Longmore 1 as a high gravity O(H) object. Adopting a distance of 800 pc, we derive R = 0.04 Rsun, L = 250 Lsun, and M = 0.6 Msun. This places the object on the white dwarf cooling sequence of the evolutionary tracks with an age of ~= 65 kyr.

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