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Articles by de Grijs
Astrophysics > Solar and Stellar Astrophysics
Ultraviolet (UV) observations offer unique insights into transient and variable astrophysical phenomena, from the Sun and nearby stars to supernovae and star-forming galaxies. Here, we summarise and review the diagnostic power of the UV spectrum for probing the physical conditions, dynamics and energetics of these events.
The HASHTAG project II. Giant molecular cloud properties across the M31 disc
Star formation plays a crucial role in the evolution of galaxies, as it shapes the galaxy and contributes to the enrichment of heavy elements. Molecular clouds, the birthplaces of stars, are essential for understanding star formation theories, as their properties directly reflect the conditions for star formation and stellar feedback.
All roads lead to (New) Rome: Byzantine astronomy and geography in a rapidly changing world
Ayuda Buscar en la ayuda Buscar en la ayuda All roads lead to (New) Rome: Byzantine astronomy and geography in a rapidly changing world de Grijs, Richard [1] [1] Macquarie University Localización: De Medio Aevo, ISSN-e 2255-5889, Vol. 13, Nº. 2, 2024 (Ejemplar dedicado a: Scientific Interests and Technological Innovation in Byzantium: Interdisciplinary Perspectives), págs.
The GALAH survey: tracing the Milky Way’s formation and evolution through RR Lyrae stars
RR Lyrae stars (RRLs) play a crucial role in our understanding of the Universe. In the foundational review of the field, Preston (1964) articulated that these stars act as essential tools in unravelling the evolutionary processes that shaped our Galaxy. Through their unique characteristics and patterns, RRLs provide insights into the age, structure, and formation history of our Milky Way (MW; e.g. Dékány et al. 2013; Belokurov et al. 2018).
The GALAH survey: Elemental abundances in open clusters using joint effective temperature and surface gravity photometric priors
The ability to measure precise and accurate stellar effective temperatures (T ) and surface gravities (log (g)) is essential in determining accurate and precise abundances of chemical elements in stars. Measuring log (g) from isochrones fitted to colour-magnitude diagrams of open clusters is significantly more accurate and precise compared to spectroscopic log (g).
The role of tidal interactions in the formation of slowly rotating early-type stars in young star clusters
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 upper main-sequence stars. Tidal interactions have been suggested as a possible explanation of the dichotomy of the stellar rotation rates. This hypothesis proposes that the slow rotation rates of stars along the split main sequences are caused by tidal interactions in binaries.
Unravelling the period gap using LAMOST chromospheric activity indices
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 Dra data base with catalogues from the Kepler and K2 surveys, revealing a prominent period gap. Here, we use this combined ZTF–Kepler–K2 data set to investigate the origin of the period gap observed for BY Dra stars using chromospheric activity indices.
[2201.08467] Historical Chinese efforts to determine longitude at sea
[Submitted on 20 Jan 2022] Authors:Richard de Grijs (Macquarie University, Sydney, Australia) Download PDF Abstract: High-level Chinese cartographic developments predate European innovations by several centuries.
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