Space observatories have provided unprecedented depictions of the many variability behaviors typical of low-mass, young stars. However, those studies have so far largely omitted more massive objects (∼2 M _⊙ to 4–5 M _⊙) and were limited by the absence of simultaneous, multiwavelength information. We present a new study of young star variability in the ∼1–2 Myr old, massive Lagoon Nebula region. Our sample encompasses 278 young, late B to K-type stars, monitored with Kepler/K2. Auxiliary u, g, r, i, Hα time-series photometry, simultaneous with K2, was acquired at the Paranal Observatory. We employed this comprehensive data set and archival infrared photometry to determine individual stellar parameters, assess the presence of circumstellar disks, and tie the variability behaviors to inner disk dynamics. We found significant mass-dependent trends in variability properties, with B/A stars displaying substantially reduced levels of variability compared to G/K stars for any light-curve morphology. These properties suggest different magnetic field structures at the surface of early-type and later-type stars. We also detected a dearth of some disk-driven variability behaviors, particularly dippers, among stars earlier than G. This indicates that their higher surface temperatures and more chaotic magnetic fields prevent the formation and survival of inner disk dust structures corotating with the star. Finally, we examined the characteristic variability timescales within each light curve and determined that the day-to-week timescales are predominant over the K2 time series. These reflect distinct processes and locations in the inner disk environment, from intense accretion triggered by instabilities in the innermost disk regions to variable accretion efficiency in the outer magnetosphere.

太空天文台对低质量年轻恒星的许多典型变化行为提供了前所未有的描述。然而，迄今为止，这些研究在很大程度上忽略了更大质量的物体（~2 M _⊙到 4-5 M _⊙），并且受到缺乏同步多波长信息的限制。我们提出了一项关于 1-2 Myr 老大质量泻湖星云区域中年轻恒星变异的新研究。我们的样本包含 278 颗年轻的晚 B 到 K 型恒星，由开普勒/K2 监测。辅助u , g , r , i , H α与 K2 同步的时间序列光度测量是在帕拉纳尔天文台获得的。我们使用这个全面的数据集和档案红外光度法来确定单个恒星参数，评估星周盘的存在，并将变异行为与盘内动力学联系起来。我们发现变异特性的显着质量依赖趋势，对于任何光曲线形态，与 G/K 星相比，B/A 星显示出显着降低的变异水平。这些特性表明早型和晚型恒星表面的磁场结构不同。我们还检测到在 G 之前的恒星中缺乏一些盘驱动的可变性行为，尤其是北斗星。这表明它们更高的表面温度和更混乱的磁场阻止了与恒星共转的盘内尘埃结构的形成和生存。最后，我们检查了每条光曲线内的特征可变性时间尺度，并确定每天到每周的时间尺度在 K2 时间序列中占主导地位。这些反映了内部磁盘环境中的不同过程和位置，从最内部磁盘区域的不稳定性引发的强烈吸积到外部磁层中可变的吸积效率。