1k citations · 6k across the 136 of their papers we have counts for
10 papers · 1 filter
Fifty years of primordial helium abundances: A statistical reanalysis
Nabil Husain, Richard de Grijs, Giuseppe Bono
The primordial helium mass fraction, , is a key observational pillar of Big Bang nucleosynthesis and a sensitive probe of early-Universe physics. Over the past severa…
The NGC 5253 star cluster system. I. Standard modelling and infrared-excess sources
Richard de Grijs, Peter Anders, Erik Zackrisson +1
Using high-resolution Hubble Space Telescope data, we reexamine the fundamental properties (ages, masses and extinction values) of the rich star cluster population in the dwarf sta…
Extremely rapid star cluster disruption in high-shear circumnuclear starburst rings: the unusual case of NGC 7742
Richard de Grijs, Peter Anders
All known mass distributions of recently formed star cluster populations resemble a "universal" power-law function. Here we assess the impact of the extremely disruptive environmen…
Systematic differences in simple stellar population model results: Application to the M31 globular-like cluster system
Z. Fan, R. de Grijs
Simple stellar population (SSP) synthesis models are useful tools for studying the nature of unresolved star clusters in external galaxies. However, the plethora of currently avail…
The VMC Survey. V. First results for Classical Cepheids
V. Ripepi, M. I. Moretti, M. Marconi +11
The VISTA Magellanic Cloud (VMC, PI M.R. Cioni) survey is collecting deep Ks-band time-series photometry of the pulsating variable stars hosted by the system formed by the two Mage…
The VMC survey III. Mass-loss rates and luminosities of LMC AGB stars
M. Gullieuszik, M. A. T. Groenewegen, M. -R. L. Cioni +7
Dust radiative transfer models are presented for all 374 AGB stars candidates in one of the fields observed by the new VISTA survey of the Magellanic Clouds (VMC). Mass-loss rates,…
The VMC Survey - I. Strategy and First Data
M. -R. L. Cioni, G. Clementini, L. Girardi +31
The new VISual and Infrared Telescope for Astronomy (VISTA) has started operations. Over its first five years it will be collecting data for six public surveys, one of these is the…
An updated catalog of M31 globular-like clusters: UBVRI photometry, ages, and masses
Zhou Fan, Richard de Grijs, Xu Zhou
We present an updated UBVRI photometric catalog containing 970 objects in the field of M31, selected from the Revised Bologna Catalog (RBC v.4.0), including 965, 967, 965, 953, and…
Near-infrared and optical observations of galactic warps: A common, unexplained feature of most discs
A. Guijarro, R. F. Peletier, E. Battaner +3
Context: Warps occurring in galactic discs have been studied extensively in HI and in the optical, but rarely in the near-infrared (NIR) bands that trace the older stellar populati…
Old stellar population synthesis: New age and mass estimates for Mayall II = G1
Jun Ma, Richard de Grijs, Zhou Fan +3
Mayall II = G1 is one of the most luminous globular clusters (GCs) in M31. Here, we determine its age and mass by comparing multicolor photometry with theoretical stellar populatio…