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S-index periodicity detection based on multiple random spectral observations

Shen, Yu-Fu

The solar magnetic activity cycle has a profound impact on our lives, yet its underlying causes remain elusive. While similar cycles have been observed in other stars, these results are scarce due to the significant challenge posed by the length of time required for observation. Continuous observation over an extended period is a luxury, making it…

Physical characterization of late-type contact binary systems observed by LAMOST: a comprehensive statistical analysis

Abdel Rahman, H. I.; Darwish, Mohamed

This paper presents a catalog of approximately 1800 Eclipsing W UMa systems (EWs) using parameters from LAMOST, VSX, ZTF and Gaia. Our detailed statistical analysis includes frequency distributions of parameters, confidence intervals, and hypothesis testing to provide deeper insights into the physical properties of this important eclipsing binary …