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Star clusters: Anything but simple
Richard de Grijs
The heated debate on the importance of stellar rotation and age spreads in massive star clusters has just become hotter by throwing stellar variability into the mix.
The VMC survey - XXIII. Model fitting of light and radial velocity curves of Small Magellanic Cloud classical Cepheids
Marcella Marconi, Roberto Molinaro, Vincenzo Ripepi +7
We present the results of the chi2 minimization model fitting technique applied to optical and near-infrared photometric and radial velocity data for a sample of 9 fundamental and…
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 VMC Survey XXII. Hierarchical Star Formation in the 30 Doradus-N158-N159-N160 Star-Forming Complex
Ning-Chen Sun, Richard de Grijs, Smitha Subramanian +6
We study the hierarchical stellar structures in a 1.5 deg area covering the 30 Doradus-N158-N159-N160 star-forming complex with the VISTA Survey of the Magellanic Clouds.…
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…
Gamma-ray burst progenitors
Andrew Levan, Paul Crowther, Richard de Grijs +3
We review our current understanding of the progenitors of both long and short duration gamma-ray bursts (GRBs). Constraints can be derived from multiple directions, and we use thre…
Young star clusters in circumnuclear starburst rings
Richard de Grijs, Chao Ma, Siyao Jia +2
We analyse the cluster luminosity functions (CLFs) of the youngest star clusters in three galaxies exhibiting prominent circumnuclear starburst rings. We focus specifically on NGC…
Lick Indices and Spectral Energy Distribution Analysis based on an M31 Star Cluster Sample: Comparisons of Methods and Models
Zhou Fan, Richard de Grijs, Bingqiu Chen +3
Application of fitting techniques to obtain physical parameters---such as ages, metallicities, and -element to iron ratios---of stellar populations is an important approach to u…
Clustering of Local Group distances: publication bias or correlated measurements? IV. The Galactic Center
Richard de Grijs, Giuseppe Bono
Aiming at deriving a statistically well-justified Galactic Center distance, , and reducing any occurrence of publication bias, we compiled the most comprehensive and most comp…
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…
First Observational Signature of Rotational Deceleration in a Massive, Intermediate-age Star Cluster in the Magellanic Clouds
Xiaohan Wu, Chengyuan Li, Richard de Grijs +1
While the extended main-sequence turn-offs (eMSTOs) found in almost all 1--2 Gyr-old star clusters in the Magellanic Clouds are often explained by postulating extended star-formati…
The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population
Chengyuan Li, Richard de Grijs, Nathan Bastian +3
The presence of extended main-sequence turn-off (eMSTO) regions in intermediate-age star clusters in the Large and Small Magellanic Clouds is often interpreted as resulting from ex…
Formation of new stellar populations from gas accreted by massive young star clusters
Chengyuan Li, Richard de Grijs, Licai Deng +4
Stars in star clusters are thought to form in a single burst from a common progenitor cloud of molecular gas. However, massive, old globular clusters -- with ages greater than 10 b…