论文标题
确认两个蓝色大振幅脉动器超过20秒以上的单颗粒状性
Confirmation of Monoperiodicity Above 20 Seconds for Two Blue Large-Amplitude Pulsators
论文作者
论文摘要
蓝色的大振幅脉动器（BLAPS）是一类新的脉动变量恒星。它们位于Hertzsprung-russell图中的热个子分支附近，并具有后期O或早期B的光谱类别。恒星进化模型表明，这些恒星可能在其内部的铁群不透明度驱动。许多具有相似驾驶机制的可变星在热的细分分支附近存在，其由压力（P）或重力（G）模式引起的多周期振荡。在Ogle Discovery Light曲线中未检测到多周期信号，因为很难检测到与具有Ogle Cadence的高阶P模式相关的短期信号。使用利物浦望远镜上的上升仪器，我们制作了两个空白的高节奏光曲线，Ogle-blap-009（$ M _ {\ Mathrm {v}} = 15.65 $ mag）和Ogle-blap-014（$ m _ {$ m _ {\ mathrm {v}} $ nmag = 16.79 $ 720使用。这些光曲线的频率分析确定了一个主要振荡，其周期为$ 31.935 \ pm0.0098 $ mins，而Blap-009的傅立叶系列拟合的幅度为0.236美元。 Blap-014的分析确定了$ 33.625 \ PM0.0214 $ Mins的期间，幅度为$ 0.225 $ MAG。对残留光曲线的分析显示，BLAP-009的额外差异没有额外的短期可变性降低至$ 15.20 \ pm0.26 $ mmag $ 58.60 \ pm3.44 \ pm3.44 $ mmag blap-014的最低时间为20美元$ s和$ 60 $。这些结果进一步证实了这些空白是单层次的。
Blue Large-Amplitude Pulsators (BLAPs) are a new class of pulsating variable star. They are located close to the hot subdwarf branch in the Hertzsprung-Russell diagram and have spectral classes of late O or early B. Stellar evolution models indicate that these stars are likely radially pulsating, driven by iron group opacity in their interiors. A number of variable stars with a similar driving mechanism exist near the hot subdwarf branch with multi-periodic oscillations caused by either pressure (p) or gravity (g) modes. No multi-periodic signals were detected in the OGLE discovery light curves since it would be difficult to detect short period signals associated with higher-order p modes with the OGLE cadence. Using the RISE instrument on the Liverpool Telescope, we produced high cadence light curves of two BLAPs, OGLE-BLAP-009 ($m_{\mathrm{v}}=15.65$ mag) and OGLE-BLAP-014 ($m_{\mathrm{v}}=16.79$ mag) using a $720$ nm longpass filter. Frequency analysis of these light curves identify a primary oscillation with a period of $31.935\pm0.0098$ mins and an amplitude from a Fourier series fit of $0.236$ mag for BLAP-009. The analysis of BLAP-014 identifies a period of $33.625\pm0.0214$ mins and an amplitude of $0.225$ mag. Analysis of the residual light curves reveals no additional short period variability down to an amplitude of $15.20\pm0.26$ mmag for BLAP-009 and $58.60\pm3.44$ mmag for BLAP-014 for minimum periods of $20$ s and $60$ s respectively. These results further confirm that the BLAPs are monoperiodic.
