Colour-magnitude diagrams reveal a population of blue (hot) sub-luminous objects with respect to the main sequence. These hot sub-luminous stars are the result of evolutionary processes that require stars to expel their obscuring, hydrogen-rich envelopes to reveal the hot helium core. As such, these objects offer a direct window into the hearts of stars that are otherwise inaccessible to direct observation. We showcase MeerLICHT's capabilities of detecting faint hot subdwarfs and identifying the dominant frequency in the photometric variability of these compact hot stars, in comparison to their $Gaia$ DR3 data. We hunt for oscillations, which will be an essential ingredient for accurately probing stellar interiors in future asteroseismology. Comparative MeerLICHT and $Gaia$ colour-magnitude diagrams are presented as a way to select hot subdwarfs from our sample. A dedicated frequency determination technique is developed and applied to the selected candidates to determine their dominant variability using time-series data from MeerLICHT and $Gaia$ DR3. We explore the power of both datasets in determining the dominant frequency. Using the $g-i$ colour, MeerLICHT offers a colour-magnitude diagram that is comparable in quality to that of $Gaia$ DR3. The MeerLICHT colour-colour diagrams allow for the study of different stellar populations. The frequency analysis of MeerLICHT and $Gaia$ DR3 data demonstrates the superiority of our MeerLICHT multi-colour photometry in estimating the dominant frequency compared to the sparse $Gaia$ DR3 data. MeerLICHT's multi-band photometry leads to the discovery of high-frequency faint subdwarfs. Our MeerLICHT results are a proof-of-concept of the capacity of the BlackGEM instrument currently in the commissioning stage at ESO's La Silla Observatory in Chile.
翻译:颜色放大图显示蓝色( 热) 亚光度下天体相对于主序列。 这些热亚光度恒星是进化过程的结果, 这些进化过程要求恒星将模糊的、 含氢的封套分离出来, 以揭示热 ⁇ 核心。 因此, 这些天体为那些否则无法直接观测的恒星的心脏提供了直接窗口。 我们展示了 MeerLICHT 检测微热亚矮体的能力, 并辨别这些紧凑热恒星光度变异的主导频率, 与它们的$G3 数据相比。 我们寻找振动的振动极光度振动, 这将成为在未来恒星核心中精确的恒星内。 比较MeLICHT 和 $GLIA 的彩色放大图解变异常数据显示S- hlexcialT 和 $GDR3 的变压数据。 我们的变现变色数据显示S- drial- drial 数据在SDRA 的变色数据分析中, 我们的变色数据显示S- droal- dal- dal 数据显示SDRDR3。