Electron Densities, Radial and Terminal Wind Velocities for the Planetary Nebula NGC 6302 and Its O VI-Type Binary Nucleus
Electron Densities, Radial and Terminal Wind Velocities for the Planetary Nebula NGC 6302 and Its O VI-Type Binary Nucleus
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行星状星云 NGC 6302 及其 O VI 型双星核的电子密度、径向风速和末端风速
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发表时间：
2001
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通讯作者：
W. Feibelman
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作者：
W. Feibelman
对ngc6302及其核的高色散和低色散IUE光谱进行了分析。NEWSIPS格式的光谱揭示了许多高激发发射特征，包括恒星O V、O VI、O VII和O VIII，这些特征表明该核是“O VI序列”的新成员。此外，还观察到ovi λ1032共振激发的feii特征。其他高激发物质包括[Ne IV]、[Ne V]、[Mg VI]和[Si VII]。用ciii]、niii]、niv]和[neiv]测定了电子密度，并与IR [nev]密度进行了比较。除了Bowen O III和[O II]线显示出较大的正径向速度外，强发射特征的径向速度集中在-55 km s-1附近。总结了IUE、光学、地面红外和KAO红外数据的结果。根据C IV λ1548特征的P - Cygni剖面估计了-520±200 km s-1的较低终端风速。LWR/LWP低色散光谱表明，这颗非常热的白矮星中心恒星存在g型伴星。
Archival high- and low-dispersion IUE spectra of NGC 6302 and its nucleus have been analyzed. The spectra in the NEWSIPS format reveal many high-excitation emission features, including stellar O V, O VI, O VII, and O VIII that identify the nucleus as a new member of the "O VI sequence." Fe II features that are resonantly excited by O VI λ1032 are also observed. Other high-excitation species include [Ne IV], [Ne V], [Mg VI], and [Si VII]. Electron densities were determined from C III], N III], N IV], and [Ne IV] and are compared to IR [Ne V] densities. Radial velocities of strong emission features cluster around -55 km s-1 except for the Bowen O III and [O II] lines that show large positive radial velocities. Results from IUE, optical, ground-based IR, and KAO IR data are summarized. A relatively low terminal wind velocity of -520 ± 200 km s-1 was estimated from the P Cygni profile of the C IV λ1548 feature. A G-type companion to the very hot white dwarf central star is indicated by the LWR/LWP low-dispersion spectra.