D. Geisler
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View article: CAPOS: The bulge Cluster APOgee Survey
CAPOS: The bulge Cluster APOgee Survey Open
We present the first detailed spectroscopic analysis of the heavily extincted bulge globular cluster Terzan 2 (Ter 2) based on high-resolution near-infrared spectra obtained as part of the CAPOS (bulge Cluster APOgee Survey) project. CAPOS…
View article: Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters Open
Phosphorus-enhanced (P-rich; [P/Fe] ≳ +0.8) giants have been found among mildly metal-poor field stars, but in only one star in a globular cluster (GC), M4 (NGC 6121). Also, in a sample of bulge spheroid stars, some of them showed a modera…
View article: CAPOS: The bulge Cluster APOgee Survey
CAPOS: The bulge Cluster APOgee Survey Open
Context. Bulge globular clusters (BGCs) are exceptional tracers of the formation and chemodynamical evolution of this oldest Galactic component. Until now, observational difficulties have prevented us from taking full advantage of these po…
View article: CAPOS: the bulge Cluster APOgee Survey IX. Spectroscopic Analysis of the Bulge Globular Cluster Terzan 2
CAPOS: the bulge Cluster APOgee Survey IX. Spectroscopic Analysis of the Bulge Globular Cluster Terzan 2 Open
We present the first detailed spectroscopic analysis of the heavily extincted bulge globular cluster Terzan 2 (Ter 2) based on high-resolution near-infrared spectra obtained as part of the CAPOS (the bulge Cluster APOgee Survey) project. C…
View article: Revealing the chemical structure of the Magellanic Clouds with APOGEE. II. Abundance gradients of the Large Magellanic Cloud
Revealing the chemical structure of the Magellanic Clouds with APOGEE. II. Abundance gradients of the Large Magellanic Cloud Open
We present the gradients of the Large Magellanic Cloud (LMC) for 25 elemental abundances and abundance ratios with their respective temporal evolution as well as age-[X/Fe] trends using 6130 LMC field red giant branch (RGB) stars observed …
View article: CAPOS: The bulge Cluster APOgee Survey
CAPOS: The bulge Cluster APOgee Survey Open
Context . The bulge globular cluster (BGC) NGC 6316 has been the subject of few previous chemical studies beyond metallicity. Thanks to the bulge Cluster APOgee Survey (CAPOS), we can now improve our knowledge of the chemistry and nature o…
View article: CAPOS: The bulge Cluster APOgee Survey
CAPOS: The bulge Cluster APOgee Survey Open
Context . The CAPOS project aims to obtain accurate mean abundances for many elements and their mean radial velocities, and it explores the multiple population (MP) phenomenon in Galactic bulge globular clusters (BGCs). NGC 6569 is one of …
View article: CAPOS: The bulge Cluster APOgee Survey
CAPOS: The bulge Cluster APOgee Survey Open
We performed a detailed abundance analysis of ten red giant members of the heavily obscured bulge globular cluster HP 1 using high-resolution, high S/N, near-infrared spectra collected with the Apache Point Observatory Galactic Evolution E…
View article: The bulge globular cluster Terzan 6 as seen from multi-conjugate adaptive optics and HST
The bulge globular cluster Terzan 6 as seen from multi-conjugate adaptive optics and HST Open
This work consists of the first detailed photometric study of Terzan 6, one of the least known globular clusters in the Galactic bulge. Through the analysis of high angular resolution and multi-wavelength data obtained from adaptive optics…
View article: Revealing the chemical structure of the Magellanic Clouds with APOGEE. III. Abundance gradients of the Small Magellanic Cloud
Revealing the chemical structure of the Magellanic Clouds with APOGEE. III. Abundance gradients of the Small Magellanic Cloud Open
We determine radial- and age-abundance gradients of the Small Magellanic Cloud (SMC) using spectra of 2062 red giant branch field stars observed by SDSS-IV / APOGEE-2S. With coverage out to $\sim$9 kpc in the SMC, these data taken with the…
View article: The VISTA Variables in the Vía Láctea extended (VVVX) ESO public survey: Completion of the observations and legacy
The VISTA Variables in the Vía Láctea extended (VVVX) ESO public survey: Completion of the observations and legacy Open
Context. The ESO public survey VISTA Variables in the Vía Láctea (VVV) surveyed the inner Galactic bulge and the adjacent southern Galactic disk from 2009–2015. Upon its conclusion, the complementary VVV extended (VVVX) survey has expanded…
View article: The VISTA Variables in the Vía Láctea eXtended (VVVX) ESO public survey: Completion of the observations and legacy
The VISTA Variables in the Vía Láctea eXtended (VVVX) ESO public survey: Completion of the observations and legacy Open
The ESO public survey VISTA Variables in the Vía Láctea (VVV) surveyed the inner Galactic bulge and the adjacent southern Galactic disk from $2009-2015$. Upon its conclusion, the complementary VVV eXtended (VVVX) survey has expanded both t…
View article: Driving factors behind multiple populations
Driving factors behind multiple populations Open
View article: Exploring the origin of the distance bimodality of stars in the periphery of the Small Magellanic Cloud with APOGEE and <i>Gaia</i>
Exploring the origin of the distance bimodality of stars in the periphery of the Small Magellanic Cloud with APOGEE and <i>Gaia</i> Open
The Magellanic Cloud system represents a unique laboratory for study of both interacting dwarf galaxies and the ongoing process of the formation of the Milky Way and its halo. We focus on one aspect of this complex, three-body interaction …
View article: Revealing the Chemical Structure of the Magellanic Clouds with APOGEE. III. Abundance Gradients of the Small Magellanic Cloud
Revealing the Chemical Structure of the Magellanic Clouds with APOGEE. III. Abundance Gradients of the Small Magellanic Cloud Open
We determine radial- and age-abundance gradients of the Small Magellanic Cloud (SMC) using spectra of 2,062 red giant branch (RGB) field stars observed by SDSS-IV / APOGEE-2S. With coverage out to $\sim$9 kpc in the SMC, these data taken w…
View article: CAPOS: The bulge Cluster APOgee Survey IV. Elemental Abundances of the bulge globular cluster NGC 6558
CAPOS: The bulge Cluster APOgee Survey IV. Elemental Abundances of the bulge globular cluster NGC 6558 Open
This study presents the results concerning six red giant stars members of the globular cluster NGC 6558. Our analysis utilized high-resolution near-infrared spectra obtained through the CAPOS initiative (the APOgee Survey of Clusters in th…
View article: CAPOS: the bulge Cluster APOgee Survey IV elemental abundances of the bulge globular cluster NGC 6558
CAPOS: the bulge Cluster APOgee Survey IV elemental abundances of the bulge globular cluster NGC 6558 Open
This study presents the results concerning six red giant stars members of the globular cluster NGC 6558. Our analysis utilized high-resolution near-infrared spectra obtained through the CAPOS initiative (the APOgee Survey of Clusters in th…
View article: Chemo-dynamical tagging in the outskirts: The origins of stellar substructures in the Magellanic Clouds
Chemo-dynamical tagging in the outskirts: The origins of stellar substructures in the Magellanic Clouds Open
We present the first detailed chemical analysis from APOGEE-2S observations of stars in six regions of recently discovered substructures in the outskirts of the Magellanic Clouds extending to 20° from the Large Magellanic Cloud (LMC) cente…
View article: Light elements Na and Al in 58 bulge spheroid stars from APOGEE
Light elements Na and Al in 58 bulge spheroid stars from APOGEE Open
We identified a sample of 58 candidate stars with metallicity [Fe/H] ≲ −0.8 that likely belong to the old bulge spheroid stellar population, and analyse their Na and Al abundances from Apache Point Observatory Galactic Evolution Experiment…
View article: Revealing the Chemical Structure of the Magellanic Clouds with APOGEE. II. Abundance Gradients of the Large Magellanic Cloud
Revealing the Chemical Structure of the Magellanic Clouds with APOGEE. II. Abundance Gradients of the Large Magellanic Cloud Open
We present the abundance gradients of the Large Magellanic Cloud (LMC) for 25 elemental abundance ratios and their respective temporal evolution as well as age-[X/Fe] trends using 6130 LMC field red giant branch (RGB) stars observed by SDS…
View article: Exploring the Origin of the Distance Bimodality of Stars in the Periphery of the Small Magellanic Cloud with APOGEE and Gaia
Exploring the Origin of the Distance Bimodality of Stars in the Periphery of the Small Magellanic Cloud with APOGEE and Gaia Open
The Magellanic Cloud system represents a unique laboratory for study of both interacting dwarf galaxies and the ongoing process of the formation of the Milky Way and its halo. We focus on one aspect of this complex, 3 body interaction - th…
View article: Roman Early-Definition Astrophysics Survey Opportunity: Galactic Roman Infrared Plane Survey (GRIPS)
Roman Early-Definition Astrophysics Survey Opportunity: Galactic Roman Infrared Plane Survey (GRIPS) Open
A wide-field near-infrared survey of the Galactic disk and bulge/bar(s) is supported by a large representation of the community of Galactic astronomers. The combination of sensitivity, angular resolution and large field of view make Roman …
View article: Chemo-Dynamical Tagging in the Outskirts: The Origins of Stellar Substructures in the Magellanic Clouds
Chemo-Dynamical Tagging in the Outskirts: The Origins of Stellar Substructures in the Magellanic Clouds Open
We present the first detailed chemical analysis from APOGEE-2S observations of stars in six regions of recently discovered substructures in the outskirts of the Magellanic Clouds extending to 20 degrees from the LMC center. We also present…
View article: Multiple Populations in Low-mass Globular Clusters: Eridanus
Multiple Populations in Low-mass Globular Clusters: Eridanus Open
Multiple populations (MPs), characterized by variations in light elemental abundances, have been found in stellar clusters in the Milky Way, Magellanic Clouds, as well as several other dwarf galaxies. Based on a large number of observation…
View article: Multiple Populations in Low-mass Globular Clusters: Eridanus
Multiple Populations in Low-mass Globular Clusters: Eridanus Open
Multiple populations (MPs), characterized by variations in light elemental abundances, have been found in stellar clusters in the Milky Way, Magellanic Clouds, as well as several other dwarf galaxies. Based on a large amount of observation…
View article: The chemical characterization of halo substructure in the Milky Way based on APOGEE
The chemical characterization of halo substructure in the Milky Way based on APOGEE Open
Galactic haloes in a Λ-CDM universe are predicted to host today a swarm of debris resulting from cannibalized dwarf galaxies. The chemodynamical information recorded in their stellar populations helps elucidate their nature, constraining t…
View article: Ca triplet metallicities and velocities for 12 globular clusters toward the galactic bulge
Ca triplet metallicities and velocities for 12 globular clusters toward the galactic bulge Open
Context. Globular clusters (GCs) are excellent tracers of the formation and early evolution of the Milky Way. The bulge GCs (BGCs) are particularly important because they can reveal vital information about the oldest in situ component of t…
View article: The Open Cluster Chemical Abundances and Mapping Survey. VI. Galactic Chemical Gradient Analysis from APOGEE DR17
The Open Cluster Chemical Abundances and Mapping Survey. VI. Galactic Chemical Gradient Analysis from APOGEE DR17 Open
The goal of the Open Cluster Chemical Abundances and Mapping (OCCAM) survey is to constrain key Galactic dynamic and chemical evolution parameters by the construction and analysis of a large, comprehensive, uniform data set of infrared spe…
View article: Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid
Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid Open
The central part of the Galaxy hosts a multitude of stellar populations, including the spheroidal bulge stars, stars moved to the bulge through secular evolution of the bar, inner halo, inner thick disc, inner thin disc, as well as debris …
View article: Ca II triplet spectroscopy of Small Magellanic Cloud red giants
Ca II triplet spectroscopy of Small Magellanic Cloud red giants Open
Aims. In this paper we analyze the chemical evolution of the main body of the SMC, adding six additional clusters to previously published samples, based on homogeneously determined and accurate metallicities. Methods. We derived radial vel…