Detection and high-resolution spectroscopy of a huge flare on the old M 9 dwarf DENIS 104814.7-395606.1
Detection and high-resolution spectroscopy of a huge flare on the old M 9 dwarf DENIS 104814.7-395606.1
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老 M 9 矮星 DENIS 104814.7-395606.1 上巨大耀斑的探测和高分辨率光谱
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发表时间：
2004
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通讯作者：
J. Schmitt
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作者：
B. Fuhrmeister;J. Schmitt
我们报告了 M 9 矮星 DENIS 104814.7-395606.1 上的耀斑，其质量使其直接达到氢燃烧极限。在 1.3 小时内以光谱序列观察到该事件。在 $\mathrm{H_{\alpha}}$、$\mathrm{H_{\beta}}$ 和 Na i D 线中检测到线向蓝色波长的移动，表明质量运动。此外，我们在我们系列的最后一个光谱中检测到两条巴尔默线的蓝色一侧的通量增强。我们将其解释为上升的气体云，预计速度约为 100 $\mathrm{km\,s^{-1}}$，这可能会导致质量抛射。由于我们的仪器设置，没有看到较高的巴尔默线 $\mathrm{H_{\gamma}}$ 到 $\mathrm{H_{8}}$，但在最后的光谱中，有强有力的证据表明 $\mathrm{H_{9}}$ 处于发射状态。
We report a flare on the M 9 dwarf DENIS 104814.7-395606.1, whose mass places it directly at the hydrogen burning limit. The event was observed in a spectral sequence during 1.3 h. Line shifts to bluer wavelengths were detected in $\mathrm{H_{\alpha}}$, $\mathrm{H_{\beta}}$, and in the Na i D lines, indicating mass motions. In addition we detect a flux enhancement on the blue side of the two Balmer lines in the last spectrum of our series. We interpret this as rising gas cloud with a projected velocity of about 100 $\mathrm{km\,s^{-1}}$ which may lead to mass ejection. The higher Balmer lines $\mathrm{H_{\gamma}}$ to $\mathrm{H_{8}}$ are not seen due to our instrumental setup, but in the last spectrum there is strong evidence for $\mathrm{H_{9}}$ being in emission.