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Blue Large-Amplitude Pulsators (BLAPs) are a new class of pulsating variablestar. They are located close to the hot subdwarf branch in theHertzsprung-Russell diagram and have spectral classes of late O or early B.Stellar evolution models indicate that these stars are likely radiallypulsating, driven by iron group opacity in their interiors. A number ofvariable stars with a similar driving mechanism exist near the hot subdwarfbranch with multi-periodic oscillations caused by either pressure (p) orgravity (g) modes. No multi-periodic signals were detected in the OGLEdiscovery light curves since it would be difficult to detect short periodsignals associated with higher-order p modes with the OGLE cadence. Using theRISE instrument on the Liverpool Telescope, we produced high cadence lightcurves of two BLAPs, OGLE-BLAP-009 ($m_{\mathrm{v}}=15.65$ mag) andOGLE-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 aperiod 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 theresidual light curves reveals no additional short period variability down to anamplitude of $15.20\pm0.26$ mmag for BLAP-009 and $58.60\pm3.44$ mmag forBLAP-014 for minimum periods of $20$ s and $60$ s respectively. These resultsfurther confirm that the BLAPs are monoperiodic.

Confirmation of Monoperiodicity Above 20 Seconds for Two Blue Large-Amplitude Pulsators