227 citations · 886 across the 15 of their papers we have counts for
15 papers
Atomic Diffusion and Mixing in Old Stars VIII: Chemical abundance variations in the globular cluster M4 (NGC 6121)
T. Nordlander, P. Gruyters, O. Richard +1
Variations in chemical abundances with evolutionary phase have been identified among stars in globular and open clusters with a wide range of metallicities. In the metal-poor clust…
Atomic diffusion and mixing in old stars VII. Abundances of Mg, Ti, and Fe in M30
Alvin Gavel, Pieter Gruyters, Ulrike Heiter +4
We attempt to constrain the efficiency of additional transport or mixing processes that reduce the effect of atomic diffusion in stellar atmospheres. We apply spectral synthesis me…
First evidence of multiple populations along the AGB from Strömgren photometry
Pieter Gruyters, Luca Casagrande, Antonino P. Milone +3
Spectroscopic studies have demonstrated that nearly all Galactic globular clusters (GCs) harbour multiple stellar populations with different chemical compositions. Moreover, colour…
The Gaia-ESO Survey. Mg-Al anti-correlation in iDR4 globular clusters
E. Pancino, the GES collaboration
We use Gaia-ESO Survey iDR4 data to explore the Mg-Al anti-correlation in globular clusters, that were observed as calibrators, as a demonstration of the quality of Gaia-ESO Survey…
A Comparison of Stellar Elemental Abundance Techniques and Measurements
Natalie R. Hinkel, Patrick A. Young, Michael D. Pagano +15
Stellar elemental abundances are important for understanding the fundamental properties of a star or stellar group, such as age and evolutionary history, as well as the composition…
Atomic diffusion and mixing in old stars VI: The lithium content of M30
Pieter Gruyters, Karin Lind, Olivier Richard +7
The prediction of the PLANCK-constrained primordial lithium abundance in the Universe is in discordance with the observed Li abundances in warm Population II dwarf and subgiant sta…
The Lyman alpha Reference Sample VI: Lyman alpha escape from the edge-on disk galaxy Mrk1486
Florent Duval, Göran Östlin, Matthew Hayes +16
While numerical simulations suggest that the strength of the Lyman alpha (Lya) line of star-forming disk galaxies strongly depends on the inclination at which they are observed (i.…
The Lyman alpha reference sample. VII. Spatially resolved H kinematics
Edmund Christian Herenz, Pieter Gruyters, Ivana Orlitova +19
We present integral field spectroscopic observations with the Potsdam Multi Aperture Spectrophotometer of all 14 galaxies in the Lyman Alpha Reference Sample (LARS). We…
The Gaia-ESO Survey: A globular cluster escapee in the Galactic halo
K. Lind, S. E. Koposov, C. Battistini +37
A small fraction of the halo field is made up of stars that share the light element (Z<=13) anomalies characteristic of second generation globular cluster (GC) stars. The ejected s…
The Lyman-alpha Reference Sample: I. Survey outline and first results for Markarian 259
Göran Östlin, Matthew Hayes, Florent Duval +19
The Lyman-alpha reference sample (LARS) is a program with the Hubble Space Telescope (HST) that provides a sample of local universe laboratory galaxies in which to study the astrop…
Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
R. Smiljanic, A. J. Korn, M. Bergemann +99
The Gaia-ESO Survey is obtaining high-quality spectroscopic data for about 10^5 stars using FLAMES at the VLT. UVES high-resolution spectra are being collected for about 5000 FGK-t…
Atomic Diffusion and Mixing in Old Stars V: A deeper look into the Globular Cluster NGC 6752
Pieter Gruyters, Thomas Nordlander, Andreas J. Korn
Abundance trends in heavier elements with evolutionary phase have been shown to exist in the globular cluster NGC 6752 [Fe/H]=-1.6. These trends are a result of atomic diffusion an…
Atomic diffusion and mixing in old stars IV: Weak abundance trends in the globular cluster NGC 6752
Pieter Gruyters, Andreas J. Korn, Olivier Richard +5
Atomic diffusion in stars can create systematic trends of surface abundances with evolutionary stage. Globular clusters offer useful laboratories to put observational constraints o…
A VLT VIMOS IFU study of the ionisation nebula surrounding the Supersoft X-ray Source CAL 83
Pieter Gruyters, Katrina Exter, Timothy P. Roberts +1
CAL83 is a prototype of the class of Super Soft X-ray Sources (SXS). It is a binary consisting of a low mass secondary that is transferring mass onto a white dwarf primary and is t…
Photometric campaign on massive stars in the open cluster NGC 5617
F. Carrier, S. Saesen, M. Cherix +8
A campaign on the open cluster NGC 5617 was organized in order to characterize the pulsations and to better understand the internal structure of its stars. The variability of the c…