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The role of tidal interactions in the formation of slowly rotating early-type stars in young star clusters
Chenyu He, Chengyuan Li, Weijia Sun +9
The split main sequences found in the colour-magnitude diagrams of star clusters younger than ~600 Myr are suggested to be caused by the dichotomy of stellar rotation rates of uppe…
Unravelling the Period Gap using LAMOST Chromospheric Activity Indices
Deepak Chahal, Devika Kamath, Richard de Grijs +2
In our recent catalogue of BY Draconis (BY Dra) variables based on Zwicky Transient Facility data, we found traces of a period gap in the period-colour diagram. We combined our BY…
Kinematics of stellar substructures in the Small Magellanic Cloud
Dalal El Youssoufi, Maria-Rosa L. Cioni, Nikolay Kacharov +6
We present a kinematic analysis of the Small Magellanic Cloud using 3700 spectra extracted from the European Southern Observatory archive. We used data from Gaia and near-infrared…
The Cosmology of David Bohm: Scientific and Theological Significance
Richard de Grijs, Doru Costache
We discuss David Bohm's dual contributions as a physicist and thinker. First, de Grijs introduces Bohm's universe, with an emphasis on the physical quest that led Bohm to the elabo…
Early Star Charts of the Dutch East India Company
Richard de Grijs
As the European maritime powers expanded their reach beyond north Atlantic coastal waters to distant lands as far away as the East Indies, access to a practical means of maritime n…
Precise Empirical Determination of Metallicity Dependence of Near-infrared Period-Luminosity Relations for RR Lyrae Variables
Anupam Bhardwaj, Marcella Marconi, Marina Rejkuba +9
RR Lyrae variables are excellent population II distance indicators thanks to their well-defined period-luminosity relations (PLRs) at infrared wavelengths. We present results of ne…
Astronomical tent observatories, relics of a bygone era
Richard de Grijs
Between the mid-eighteenth and mid-nineteenth centuries, long-haul oceanic voyages of exploration and discovery routinely carried astronomical tent observatories to support land-ba…
Roger of Hereford: the twelfth-century astronomer who put Hereford on the map, literally
Richard de Grijs
By the twelfth century, northern European scholars gradually embraced Arabic innovations in science and technology. England naturally developed into a significant centre of the new…