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FAR ULTRAVIOLET SPECTROSCOPIC EXPLORER SPECTROSCOPY OF THE O VI RESONANCE DOUBLET IN SAND 2 (WO)

机译:砂2(WO)的O共振双峰的远紫外分光光度计光谱

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摘要

We present Far Ultraviolet Spectroscopic Explorer spectroscopy of Sand 2, an LMC WO-type Wolf-Rayet star, revealing the O VI resonance P Cygni doublet at 1032-1038 A. These data are combined with Hubble Space Telescope Faint Object Spectrograph ultraviolet and Mount Stromlo 2.3 m optical spectroscopy and analyzed using a spherical, non-LTE, line-blanketed code. Our study reveals exceptional stellar parameters: T_* ~ 150,000 K, v_∝ = 4100 km s~(-1), log (L/solar luminosity) = 5.3, and M = 1 x 10~(-5) solar mass yr~(-1), if we adopt a volume filling factor of 10%. Elemental abundances of C/He ~ 0.7 ± 0.2 and O/He ~ 0.15_(-0.05)~(+0.10) by number qualitatively support previous recombination line studies. We confirm that Sand 2 is more chemically enriched in carbon than LMC WC stars and that it is expected to undergo a supernova explosion within the next 5 x 10~4 yr.
机译:我们介绍了LMC WO型Wolf-Rayet星沙2的远紫外光谱总管光谱,揭示了在1032-1038 A处的O VI共振P Cygni双峰。这些数据与哈勃太空望远镜微弱物体光谱仪紫外线和Mount Stromlo结合2.3 m光谱,并使用球状,非LTE的行消隐码进行分析。我们的研究揭示了异常的恒星参数:T_ *〜150,000 K,v_∝ = 4100 km s〜(-1),log(L /太阳光度)= 5.3,M = 1 x 10〜(-5)太阳质量yr〜 (-1),如果我们采用10%的体积填充因子。 C / He〜0.7±0.2和O / He〜0.15 _(-0.05)〜(+0.10)的元素丰度定性地支持了先前的重组研究。我们证实,沙2比起LMC WC恒星在化学上更富于碳,并且有望在接下来的5 x 10〜4年内经历超新星爆炸。

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