Unveiling the Variability and Chemical Composition of AL Col

Using \tess\ short-cadence (120,s) SAP flux, we identified a rotational frequency of 0.09655,${\mathrm{d}}^{-1}$ ($P_{\mathrm{r}\mathrm{o}\mathrm{t}}=10.35733$,d). Wavelet analysis reveals that while the amplitudes of the harmonic components vary over time, the strength of the primary rotational frequency remains stable. A SED analysis of multi-band photometric data yields an effective temperature ($T_{\mathrm{e}\mathrm{f}\mathrm{f}}$) of {11,750,K.} %MDPI: Comma added for five digits in the whole text, please check. High-resolution spectroscopic observations covering wavelengthrange 4500–7000,Å provide refined estimates of \teff, =, 13,814, $\pm$, 400,K, \logg,=, 4.09, $\pm$, 0.08,dex, and \vsini, =, 16 $\pm$ 1,\kms. Abundance analysis shows solar-like composition of O,$\text{textsc}ii$, Mg,$\text{textsc}ii$, S,$\text{textsc}ii$, and Ca,$\text{textsc}ii$, while helium is under-abundant by 0.62,dex. Rare earth elements (REEs) exhibit over-abundances of up to 5.2,dex, classifying the star as an Ap/Bp-type star. AL,Col has a radius of $R=3.74\pm 0.48{\mathrm{R}}_{\odot }$, with its H–R diagram position estimating a mass of $M=4.2\pm 0.2{\mathrm{M}}_{\odot }$ and an age of $0.12\pm 0.01$ Gyr, indicating that the star has slightly evolved from the main sequence. The \tess\ light curves were modeled using a three-evolving-spot configuration, suggesting the presence of differential rotation. This star is a promising candidate for future investigations of magnetic field diagnostics and the vertical stratification of chemical elements in its atmosphere.