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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…
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…
New tidal debris nearby the Sagittarius leading tail from the LAMOST DR2 M giant stars
Jing Li, Chao Liu, Jeffrey L. Carlin +7
We report two new tidal debris nearby the Sagittarius (Sgr) tidal stream in the north Galactic cap identified from the M giant stars in LAMOST DR2 data. The M giant stars with sky…
The peculiar velocities in the Galactic outer disk--hints of the elliptical disk and the perturbation of the spiral structures
Hai-Jun Tian, Chao Liu, Jun-Chen Wan +7
We present the peculiar in-plane velocities derived from the LAMOST red clump stars. From the variations of the in-plane velocity with the Galactocentric radius for the young and o…
Characterizing the SHARDS of Disrupted Milky Way Satellites with LAMOST
Jeffrey L. Carlin, Chao Liu, Heidi Jo Newberg +7
We derive the fraction of substructure in the Galactic halo using a sample of over 10,000 spectroscopically-confirmed halo giant stars from the LAMOST spectroscopic survey. By obse…
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…