We present time resolved low resolution spectra of BLAP-009 and BLAP-014 collected with SPRAT on the Liverpool Telescope. The spectra were median-stacked in four ranges of phase. It was intended to note the variation in the shape of the helium absorption lines as a function of phase, but they do not appear to vary with time in low resolution spectra. The lack of clear offsets in the absorption lines suggest that there can only be small radial velocity due to either unseen companion or rapid expansion/contraction of the envelope.

中文翻译：

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BLAP-009 和 BLAP-014 的时间分辨低分辨率光谱

我们展示了在利物浦望远镜上用 SPRAT 收集的 BLAP-009 和 BLAP-014 的时间分辨低分辨率光谱。光谱在四个相位范围内中值堆叠。旨在记录氦吸收线形状随相位变化的变化，但在低分辨率光谱中它们似乎不随时间变化。吸收线中缺乏明显的偏移表明，由于看不见的伴星或包络的快速膨胀/收缩，只能有很小的径向速度。