John I. Bailey
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View article: New Field OB and OBe Binaries of the SMC Wing: Observational Properties and Population Modeling
New Field OB and OBe Binaries of the SMC Wing: Observational Properties and Population Modeling Open
We present a radial velocity (RV) survey of the field OB and OBe stars of the SMC Wing. We use multiepoch observations of 55 targets obtained with the Magellan Inamori-Magellan Aerial Camera and Spectrograph and M2FS multi-object spectrogr…
View article: MOMOS: The Multi-Object MKID Optical Spectrometer Simulator and Data Reduction Package
MOMOS: The Multi-Object MKID Optical Spectrometer Simulator and Data Reduction Package Open
The Multi-Object MKID Optical Spectrometer (MOMOS) is a proposed visible wavelength spectrograph that uses microwave kinetic inductance detectors (MKIDs) targeting an initial resolving power of 3500 for up to five fiber inputs. With their …
View article: Rotation and Hα Emission in a Young SMC Cluster: A Spectroscopic View of NGC 330
Rotation and Hα Emission in a Young SMC Cluster: A Spectroscopic View of NGC 330 Open
We present an analysis of high-resolution optical spectra recorded for 30 stars of the split extended main-sequence turnoff of the young (∼40 Myr) Small Magellanic Cloud globular cluster NGC 330. Spectra were obtained with the Michigan/Mag…
View article: MagAO-X: Commissioning Results and Status of Ongoing Upgrades
MagAO-X: Commissioning Results and Status of Ongoing Upgrades Open
MagAO-X is the coronagraphic extreme adaptive optics system for the 6.5 m Magellan Clay Telescope. We report the results of commissioning the first phase of MagAO-X. Components now available for routine observations include: the >2 kHz hig…
View article: MKIDGen3: Energy-Resolving, Single-Photon-Counting MKID Readout on an RFSoC
MKIDGen3: Energy-Resolving, Single-Photon-Counting MKID Readout on an RFSoC Open
Building large, cryogenic MKID arrays requires processing highly-multiplexed, wideband readout signals in real time; a task that has previously required large, heavy, and power-intensive custom electronics. In this work, we present the thi…
View article: Rotation and H$α$ emission in a young SMC cluster: a spectroscopic view of NGC 330
Rotation and H$α$ emission in a young SMC cluster: a spectroscopic view of NGC 330 Open
We present an analysis of high-resolution optical spectra recorded for 30 stars of the split extended main-sequence turnoff (eMSTO) of the young ($\sim$ 40 Myr) Small Magellanic Cloud (SMC) globular cluster NGC 330. Spectra were obtained w…
View article: Abundances of Neutron-capture Elements in 62 Stars in the Globular Cluster Messier 15
Abundances of Neutron-capture Elements in 62 Stars in the Globular Cluster Messier 15 Open
M15 is a globular cluster with a known spread in neutron-capture elements. This paper presents abundances of neutron-capture elements for 62 stars in M15. Spectra were obtained with the Michigan/Magellan Fiber System spectrograph, covering…
View article: Abundances of Neutron-Capture Elements in 62 Stars in the Globular Cluster Messier 15
Abundances of Neutron-Capture Elements in 62 Stars in the Globular Cluster Messier 15 Open
M15 is a globular cluster with a known spread in neutron-capture elements. This paper presents abundances of neutron-capture elements for 62 stars in M15. Spectra were obtained with the Michigan/Magellan Fiber System (M2FS) spectrograph, c…
View article: Fast-rotating Blue Straggler Stars in the Globular Cluster NGC 3201*
Fast-rotating Blue Straggler Stars in the Globular Cluster NGC 3201* Open
We used high-resolution spectra acquired with the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201. The surveyed sample includes blue straggler stars (BSSs)…
View article: The kinematics, metallicities, and orbits of six recently discovered Galactic star clusters with Magellan/M2FS spectroscopy
The kinematics, metallicities, and orbits of six recently discovered Galactic star clusters with Magellan/M2FS spectroscopy Open
We present Magellan/M2FS spectroscopy of four recently discovered Milky Way star clusters (Gran 3/Patchick 125, Gran 4, Garro 01, and LP 866) and two newly discovered open clusters (Gaia 9 and Gaia 10) at low Galactic latitudes. We measure…
View article: Fast rotating Blue Straggler Stars in the Globular Cluster NGC3201
Fast rotating Blue Straggler Stars in the Globular Cluster NGC3201 Open
We used high resolution spectra acquired at the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201. The surveyed sample includes Blue Stragglers Stars (BSSs) …
View article: Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo*
Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo* Open
We present spectroscopic data for 16,369 stellar targets within and/or toward 38 dwarf spheroidal galaxies and faint star clusters within the Milky Way halo environment. All spectra come from observations with the multiobject, fiber-fed ec…
View article: Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo
Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo Open
m2fs_HiRes_catalog_public.fits: public catalog of measurements derived from spectroscopic observations of individual targets with the Magellan/M2FS spectrograph in HiRes configuration m2fs_MedRes_catalog_public.fits: public catalog of meas…
View article: Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo
Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo Open
m2fs_HiRes_catalog_public.fits: public catalog of measurements derived from spectroscopic observations of individual targets with the Magellan/M2FS spectrograph in HiRes configuration m2fs_MedRes_catalog_public.fits: public catalog of meas…
View article: The Kinematics, Metallicities, and Orbits of Six Recently Discovered Galactic Star Clusters with Magellan/M2FS Spectroscopy
The Kinematics, Metallicities, and Orbits of Six Recently Discovered Galactic Star Clusters with Magellan/M2FS Spectroscopy Open
We present Magellan/M2FS spectroscopy of four recently discovered Milky Way star clusters (Gran 3/Patchick~125, Gran 4, Garro 01, LP 866) and two newly discovered open clusters (Gaia 9, Gaia 10) at low Galactic latitudes. We measure line-o…
View article: Metal Mixing in the r-process Enhanced Ultrafaint Dwarf Galaxy Reticulum II*
Metal Mixing in the r-process Enhanced Ultrafaint Dwarf Galaxy Reticulum II* Open
The ultrafaint dwarf galaxy Reticulum II was enriched by a single rare and prolific r -process event. The r -process content of Reticulum II thus provides a unique opportunity to study metal mixing in a relic first galaxy. Using multi-obje…
View article: SCExAO and Keck Direct Imaging Discovery of a Low-mass Companion Around the Accelerating F5 Star HIP 5319*
SCExAO and Keck Direct Imaging Discovery of a Low-mass Companion Around the Accelerating F5 Star HIP 5319* Open
We present the direct imaging discovery of a low-mass companion to the nearby accelerating F star, HIP 5319, using SCExAO coupled with the CHARIS, VAMPIRES, and MEC instruments in addition to Keck/NIRC2 imaging. CHARIS JHK (1.1–2.4 μ m) sp…
View article: SCExAO and Keck Direct Imaging Discovery of a Low-Mass Companion Around the Accelerating F5 Star HIP 5319
SCExAO and Keck Direct Imaging Discovery of a Low-Mass Companion Around the Accelerating F5 Star HIP 5319 Open
We present the direct imaging discovery of a low-mass companion to the nearby accelerating F star, HIP 5319, using SCExAO coupled with the CHARIS, VAMPIRES, and MEC instruments in addition to Keck/NIRC2 imaging. CHARIS $JHK$ (1.1-2.4 $μ$m)…
View article: Metal Mixing in the R-Process Enhanced Ultra-Faint Dwarf Galaxy Reticulum II
Metal Mixing in the R-Process Enhanced Ultra-Faint Dwarf Galaxy Reticulum II Open
The ultra-faint dwarf galaxy Reticulum~II was enriched by a single rare and prolific r-process event. The r-process content of Reticulum~II thus provides a unique opportunity to study metal mixing in a relic first galaxy. Using multi-objec…
View article: The MKID Pipeline: A Data Reduction and Analysis Pipeline for UVOIR MKID Data
The MKID Pipeline: A Data Reduction and Analysis Pipeline for UVOIR MKID Data Open
We present the Microwave Kinetic Inductance Detector (MKID) Pipeline, which is a general use science data pipeline for the reduction and analysis of ultraviolet, optical, and infrared MKID data sets. This paper provides an introduction to …
View article: A Population of Luminous Globular Clusters and Stripped Nuclei with Elevated Mass to Light Ratios around NGC 5128*
A Population of Luminous Globular Clusters and Stripped Nuclei with Elevated Mass to Light Ratios around NGC 5128* Open
The dense central regions of tidally disrupted galaxies can survive as ultracompact dwarfs (UCDs) that hide among the luminous globular clusters (GCs) in the halo of massive galaxies. An exciting confirmation of this model is the detection…
View article: Highly-Multiplexed Superconducting Detector Readout: Approachable High-Speed FPGA Design
Highly-Multiplexed Superconducting Detector Readout: Approachable High-Speed FPGA Design Open
This work presents the design and preliminary performance of a highly-multiplexed superconducting detector readout. The readout system is implemented on the Xilinx ZCU111 RFSoC Evaluation Board. The current design uses 12% of the DSPs, 60%…
View article: The MKID Science Data Pipeline
The MKID Science Data Pipeline Open
We present The MKID Pipeline, a general use science data pipeline for the reduction and analysis of ultraviolet, optical and infrared (UVOIR) Microwave Kinetic Inductance Detector (MKID) data sets. This paper provides an introduction to th…
View article: A population of luminous globular clusters and stripped nuclei with\n elevated mass to light ratios around NGC 5128
A population of luminous globular clusters and stripped nuclei with\n elevated mass to light ratios around NGC 5128 Open
The dense central regions of tidally disrupted galaxies can survive as\nultra-compact dwarfs (UCDs) that hide among the luminous globular clusters\n(GCs) in the halo of massive galaxies. An exciting confirmation of this model\nis the detec…
View article: Orbital Parameters and Binary Properties of 37 FGK Stars in the Cores of Open Clusters NGC 2516 and NGC 2422
Orbital Parameters and Binary Properties of 37 FGK Stars in the Cores of Open Clusters NGC 2516 and NGC 2422 Open
We present orbits for 24 binaries in the field of open cluster NGC 2516 (∼150 Myr) and 13 binaries in the field of open cluster NGC 2422 (∼130 Myr) using results from a multiyear radial-velocity (RV) survey of the cluster cores. Six of the…
View article: Spectroscopic Confirmation of the Sixth Globular Cluster in the Fornax Dwarf Spheroidal Galaxy*
Spectroscopic Confirmation of the Sixth Globular Cluster in the Fornax Dwarf Spheroidal Galaxy* Open
The Fornax dwarf spheroidal galaxy has an anomalous number of globular clusters, five, for its stellar mass. There is a longstanding debate about a potential sixth globular cluster (Fornax 6) that has recently been “rediscovered” in DECam …
View article: Dynamical masses and mass-to-light ratios of resolved massive star clusters – II. Results for 26 star clusters in the Magellanic Clouds
Dynamical masses and mass-to-light ratios of resolved massive star clusters – II. Results for 26 star clusters in the Magellanic Clouds Open
We present spectroscopy of individual stars in 26 Magellanic Cloud (MC) star clusters with the aim of estimating dynamical masses and V-band mass-to-light (M/LV) ratios over a wide range in age and metallicity. We obtained 3137 high-resolu…
View article: End-to-end Deep Learning Pipeline for Microwave Kinetic Inductance Detector (MKID) Resonator Identification and Tuning
End-to-end Deep Learning Pipeline for Microwave Kinetic Inductance Detector (MKID) Resonator Identification and Tuning Open
We present the development of a machine learning based pipeline to fully automate the calibration of the frequency comb used to read out optical/IR Microwave Kinetic Inductance Detector (MKID) arrays. This process involves determining the …
View article: The <i>β</i>Pictoris b Hill sphere transit campaign
The <i>β</i>Pictoris b Hill sphere transit campaign Open
Aims. Photometric monitoring of β Pic in 1981 showed anomalous fluctuations of up to 4% over several days, consistent with foreground material transiting the stellar disk. The subsequent discovery of the gas giant planet β Pic b and the pr…