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The analysis of the available TESS light curves of $\alpha$ Sex (HD 87887)reveals low-frequency pulsations with a period of about 9.1 hours in thisspectroscopic A0 III standard star. The IUE observations in December 1992reveal large flux variations both in the far UV and in the mid UV which areaccompanied by variations of the brightness in the V band recorded by the FineError Sensor on board IUE. The ultraviolet variability could be due to aneclipse by an hitherto undetected companion of smaller radius, possibly 2.5R$_{\odot}$ but this needs confirmation by further monitoring possibly withTESS. An abundance determination yields solar abundances for most elements.Only carbon and strontium are underabundant and titanium, vanadium and bariummildly overabundant. Identification is provided for most of the lines absorbingmore than 2% in the optical spectrum of $\alpha$ Sex. Stellar evolutionmodeling shows that $\alpha$ Sex is near the terminal-age main sequence, andits mass, radius and age are estimated to be $M = 2.57 \pm 0.32$ M$_{\odot}$,$R = 3.07 \pm 0.90$ R$_{\odot}$, $A = 385 \pm 77$ Myr, respectively.

The unexpected optical and ultraviolet variability of the standard star $\alpha$ Sex (HD 87887)