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Variability in the Milky Way: Contact binaries as diagnostic tools
Richard de Grijs, Xiaodian Chen, Licai Deng
We used the 50 cm Binocular Network (50BiN) telescope at Delingha Station (Qinghai Province) of Purple Mountain Observatory (Chinese Academy of Sciences) to obtain simultaneous …
The radial distributions of the two main-sequence components in the young massive star cluster NGC 1856
Chengyuan Li, Richard de Grijs, Licai Deng +1
The recent discovery of double main sequences in the young, massive star cluster NGC 1856 has caught significant attention. The observations can be explained by invoking two stella…
New open cluster Cepheids in the VVV survey tightly constrain near-infrared period--luminosity relations
Xiaodian Chen, Richard de Grijs, Licai Deng
Classical Cepheids are among the most useful Galactic and nearby extragalactic distance tracers because of their well-defined period--luminosity relations (PLRs). Open cluster (OC)…
Contact Binaries as Viable Distance Indicators: New, Competitive (V)JHKs Period-Luminosity Relations
Xiaodian Chen, Richard de Grijs, Licai Deng
Based on the largest catalogs currently available, comprising 6090 contact binaries (CBs) and 2167 open clusters, we determine the near-infrared CB period--luminosity…
Stellar populations in star clusters
Chengyuan Li, Richard de Grijs, Licai Deng
Stellar populations contain the most important information about star clus- ter formation and evolution. Until several decades ago, star clusters were believed to be ideal laborato…
Physical parameter study of eight W Ursae Majoris-type contact binaries in NGC 188
Xiaodian Chen, Licai Deng, Richard de Grijs +10
We used the newly commissioned 50 cm Binocular Network (50BiN) telescope at Qinghai Station of Purple Mountain Observatory (Chinese Academy of Sciences) to observe the old open clu…