3 papers
math.DS2025
Factorizable embeddings and the period of an irreducible sofic shift
Brian Marcus, Tom Meyerovitch, Klaus Thomsen +1
Generalizing a result of MacDonald we give necessary and sufficient conditions for an arbitrary subshift to embed into an irreducible sofic shift factoring through a given cover by…
astro-ph.SR2025
Extremely Low Mass Ratio Contact Binaries. II. The First Photometric and Spectroscopic Investigations of Six Systems with Orbital Periods Longer than 0.5 days
Fei Liu, Kai Li, Xiang Gao +7
The photometric and spectroscopic studies of six contact binaries were performed for the first time. The orbital periods of all the six targets are longer than 0.5d, and we discove…
astro-ph.SR2024
Photometric and Spectroscopic Investigations of Three Large Amplitude Contact Binaries
Xin Xu, Kai Li, Fei Liu +8
We performed photometric and spectroscopic studies of three large amplitude contact binaries, NSVS 2418361, ATLAS J057.1170+31.2384 and NSVS 7377875. The amplitudes of three system…