K. Hollyhead
YOU?
Author Swipe
View article: Star cluster formation in the most extreme environments: insights from the HiPEEC survey
Star cluster formation in the most extreme environments: insights from the HiPEEC survey Open
We present the Hubble imaging Probe of Extreme Environments and Clusters (HiPEEC) survey. We fit HST NUV to NIR broad-band and H α fluxes to derive star cluster ages, masses, and extinctions and determine the star formation rate (SFR) of s…
View article: Spectroscopic detection of multiple populations in the ∼2 Gyr old cluster Hodge 6 in the LMC
Spectroscopic detection of multiple populations in the ∼2 Gyr old cluster Hodge 6 in the LMC Open
We report the spectroscopic discovery of abundance spreads (i.e. multiple\npopulations) in the ~2 Gyr old cluster in the LMC, Hodge 6. We use low\nresolution VLT FORS2 spectra of 15 member stars in the cluster to measure their\nCN and CH b…
View article: The search for multiple populations in Magellanic Cloud clusters -- IV. Coeval multiple stellar populations in the young star cluster NGC 1978
The search for multiple populations in Magellanic Cloud clusters -- IV. Coeval multiple stellar populations in the young star cluster NGC 1978 Open
We have recently shown that the ∼2 Gyr old Large Magellanic Cloud star cluster NGC 1978 hosts multiple populations in terms of star-to-star abundance variations in [N/Fe]. These can be seen as a splitting or spread in the subgiant and red …
View article: Kron 3: a fourth intermediate age cluster in the SMC with evidence of multiple populations
Kron 3: a fourth intermediate age cluster in the SMC with evidence of multiple populations Open
We present the results of a spectroscopic study of the intermediate age (approximately 6.5 Gyr) massive cluster Kron 3 in the Small Magellanic Cloud. We measure CN and CH band strengths (at 3839 and 4300 Angstroms respectively) using VLT F…
View article: The formation and evolution of massive clusters in extragalactic environments
The formation and evolution of massive clusters in extragalactic environments Open
There are a host of open questions in the study of massive clusters relating to cluster formation and evolution. Understanding these processes can be useful in studying their host galaxies and how they have evolved. The formation of globul…
View article: Interpreting the complex CMDs of the Magellanic Clouds clusters
Interpreting the complex CMDs of the Magellanic Clouds clusters Open
The Magellanic Clouds host a large population of massive (> 10^4 Msun) star clusters with ages ranging from a few Myr to 12 Gyr. In nearly all cases, close inspection of their CMDs reveals features that deviate from expectations of a class…
View article: Age as a major factor in the onset of multiple populations in stellar clusters
Age as a major factor in the onset of multiple populations in stellar clusters Open
It is now well established that globular clusters (GCs) exhibit star-to-star light-element abundance variations (known as multiple stellar populations, MPs). Such chemical anomalies have been found in (nearly) all the ancient GCs (more tha…
View article: The search for multiple populations in Magellanic Cloud Clusters – III. No evidence for multiple populations in the SMC cluster NGC 419
The search for multiple populations in Magellanic Cloud Clusters – III. No evidence for multiple populations in the SMC cluster NGC 419 Open
We present the third paper about our ongoing Hubble Space Telescope survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, an similar to 1.5 Gyr old, massive (…
View article: The search for multiple populations in Magellanic Cloud clusters – II. The detection of multiple populations in three intermediate-age SMC clusters
The search for multiple populations in Magellanic Cloud clusters – II. The detection of multiple populations in three intermediate-age SMC clusters Open
This is the second paper in our series about the search for multiple populations in Magellanic Cloud star clusters using the Hubble Space Telescope. Here we report the detection of multiple stellar populations in the colour-magnitude diagr…
View article: Evidence for multiple populations in the intermediate-age cluster Lindsay 1 in the SMC
Evidence for multiple populations in the intermediate-age cluster Lindsay 1 in the SMC Open
Lindsay 1 is an intermediate-age (≈8 Gyr) massive cluster in the Small Magellanic Cloud. Using VLT FORS2 spectra of 16 probable cluster members on the lower red giant branch of the cluster, we measure CN and CH band strengths (at ≃ 3883 an…
View article: The search for multiple populations in Magellanic Cloud clusters – I. Two stellar populations in the Small Magellanic Cloud globular cluster NGC 121
The search for multiple populations in Magellanic Cloud clusters – I. Two stellar populations in the Small Magellanic Cloud globular cluster NGC 121 Open
We started a photometric survey using the WFC3/UVIS instrument onboard the Hubble Space Telescope to search for multiple populations within Magellanic Cloud star clusters at various ages. In this paper, we introduce this survey. As first r…
View article: Properties of the cluster population of NGC 1566 and their implications
Properties of the cluster population of NGC 1566 and their implications Open
We present results of a photometric study into the cluster population of NGC 1566, a nearby grand design spiral galaxy, sampled out to a Galactocentric radius of ≈5.5 kpc. The shape of the mass-limited age distribution shows negligible …
View article: Sizes and shapes of young star cluster light profiles in M83
Sizes and shapes of young star cluster light profiles in M83 Open
We measure the radii and two-dimensional light profiles of a large sample of young, massive star clusters in M83 using archival HST/Wide Field Camera 3 (WFC3) imaging of seven adjacent fields. We use galfit to fit the two-dime…
View article: Studying the YMC population of M83: how long clusters remain embedded, their interaction with the ISM and implications for GC formation theories
Studying the YMC population of M83: how long clusters remain embedded, their interaction with the ISM and implications for GC formation theories Open
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
View article: Constraining globular cluster formation through studies of young massive clusters – V. ALMA observations of clusters in the Antennae
Constraining globular cluster formation through studies of young massive clusters – V. ALMA observations of clusters in the Antennae Open
Some formation scenarios that have been put forward to explain multiple\npopulations within Globular Clusters (GCs) require that the young massive\ncluster have large reservoirs of cold gas within them, which is necessary to\nform future g…