CJ
Christian I. Johnson
astro-ph.GAastro-ph.SRastro-ph.IMastro-phastro-ph.HE
On Valency
published · living versionsW_g6gw2y7t·v1 · currentpublished
To Grow Old and Peculiar: A Survey of Anomalous Variable Stars in M80 and Age Determination using K2 and Gaia
with László Molnár, Emese Plachy, Attila Bódi, András Pál +9
1 version
W_5awtb63e·v1published
Preprints & journals
77 papers in the corpus · 2008–2026Is the Nuclear Star Cluster a Bulge Fossil Fragment?2609.02230v1 · R. Michael Rich, Brian Thorsbro, Christian Johnson2026 · 0 citationsarXiv
LP-Infinity: overcoming limits to the number of lifetime positions in the COS FUV channel2608.25863v1 · David J. Sahnow, Christian I. Johnson2026 · 0 citationsarXiv
Disco in the Dust: Reflected light at the bow shock around Betelgeuse's companion explains its observed luminosity2608.11672v1 · Jared A. Goldberg, Meridith Joyce, Anna J. G. O'Grady et al.2026 · 0 citationsarXiv
COS2035: Extending COS/FUV Operations Through the 2030s2607.14241v1 · Marc Rafelski, David Sahnow, Christian I. Johnson et al.2026 · 0 citationsarXiv
Reference File Updates Following the Application of New Geometric Distortion and Walk Corrections I: Overview2602.09917v1 · Nick Indriolo, William J. Fischer, Elaine Frazer et al.2026 · 0 citationsarXiv
The Milky Way Bulge Extra-Tidal Star Survey: NGC 65692512.19074v2 · Joanne Hughes, Andrea Kunder, Kevin Covey et al.2025 · 0 citationsarXiv
The Two-infall Model Revisited: Constraints on Milky Way Bulge Assembly from >30,000 Galactic Chemical Evolution Models and Machine Learning2512.08090v2 · Niall Miller, Meridith Joyce, Christian I. Johnson et al.2025 · 0 citationsThe Astrophysical Journal, 1006:41 (2026)
An excess of luminous white dwarfs in the peculiar Galactic globular cluster NGC 28082509.26190v2 · Laksh Gupta, Samyaday Choudhury, Annalisa Calamida et al.2025 · 1 citationarXiv
A Wavelength-Aware Unsupervised Learning Approach for Large, Multicolor, Photometric Surveys2507.17882v2 · Bradley D. Hutchinson, Catherine A. Pilachowski, Christian I. Johnson2025 · 0 citationsarXiv
Betelgeuse, Betelgeuse, Betelgeuse, Betel-buddy? Constraints on the dynamical companion to Orionis from HST2505.18375v2 · Jared A. Goldberg, Anna J. G. O'Grady, Meridith Joyce et al.2025 · 4 citationsarXiv
Betelgeuse's Buddy: X-Ray Constraints on the Nature of Ori B2505.18376v2 · Anna J.G. O'Grady, Brendan O'Connor, Jared A. Goldberg et al.2025 · 4 citationsarXiv
RR Lyrae Stars Belonging to the Candidate Globular Cluster Patchick 992401.13825v2 · Evan Butler (1, Andrea Kunder, Zdenek Prudil et al.2024 · 5 citationsarXiv
The Milky Way Bulge extra-tidal star survey: BH 261 (AL 3)2310.18575v1 · Andrea Kunder, Zdenek Prudil, Kevin Covey et al.2023 · 5 citationsarXiv
The Blanco DECam Bulge Survey (BDBS) VIII: Chemo-kinematics in the southern Galactic bulge from 2.3 million red clump stars with Gaia DR3 proper motions2310.17542v1 · Tommaso Marchetti, Meridith Joyce, Christian Johnson et al.2023 · 0 citationsarXiv
To Grow Old and Peculiar: A Survey of Anomalous Variable Stars in M80 and Age Determination using K2 and Gaia2308.01560v2 · L'aszl'o Moln'ar, Emese Plachy, Attila B'odi et al.2023 · 6 citationsA&A 678, A104 (2023)on Valency
A Wide View of the Galactic Globular Cluster NGC 2808: Red Giant and Horizontal Branch Star Spatial Distributions2305.06419v1 · Christian I. Johnson, Annalisa Calamida, Justin A. Kader et al.2023 · 3 citationsarXiv
Metal Mixing in the R-Process Enhanced Ultra-Faint Dwarf Galaxy Reticulum II2207.03499v2 · Alexander P. Ji, Joshua D. Simon, Ian U. Roederer et al.2022 · 37 citationsarXiv
Blanco DECam Bulge Survey (BDBS) IV: Metallicity Distributions and Bulge Structure from 2.6 Million Red Clump Stars2206.14851v1 · Christian I. Johnson, R. Michael Rich, Iulia T. Simion et al.2022 · 29 citationsarXiv
Blanco DECam Bulge Survey (BDBS) V. Cleaning the foreground populations from Galactic bulge colour-magnitude diagrams using Gaia EDR32206.12817v1 · Tommaso Marchetti, Christian I. Johnson, Meridith Joyce et al.2022 · 10 citationsA&A 664, A124 (2022)
The Ages of Galactic Bulge Stars with Realistic Uncertainties2205.07964v2 · Meridith Joyce, Christian I. Johnson, Tommaso Marchetti et al.2022 · 40 citationsarXiv
HST observations of the globular cluster NGC 6402 (M14) and its peculiar multiple populations2201.02546v1 · Francesca D'Antona, Antonino P. Milone, Christian I. Johnson et al.2022 · 13 citationsarXiv
Blanco DECam Bulge Survey (BDBS) III: A new view of the double red clump in the Milky Way bulge through luminosity and color distribution2101.06269v1 · Dongwook Lim, Andreas J. Koch-Hansen, Chul Chung et al.2021 · 16 citationsA&A 647, A34 (2021)
Difference in chemical composition between the bright and faint red clump stars in the Milky Way bulge2012.03954v1 · Dongwook Lim, Young-Wook Lee, Andreas Koch et al.2020 · 14 citationsarXiv
The Blanco DECam Bulge Survey. I. The Survey Description and Early Results2008.09255v2 · R. Michael Rich, Christian I. Johnson, Michael Young et al.2020 · 21 citationsarXiv
Blanco DECam Bulge Survey (BDBS) II: Project Performance, Data Analysis, and Early Science Results2008.09257v1 · Christian I. Johnson, R. Michael Rich, Michael D. Young et al.2020 · 33 citationsarXiv
The Bulge Radial Velocity Assay for RR Lyrae stars (BRAVA-RR) DR2: a Bimodal Bulge?2004.11382v1 · Andrea Kunder, Angeles Perez-Villegas, R. Michael Rich et al.2020 · 63 citationsarXiv
The Most Metal-poor Stars in Omega Centauri (NGC 5139)2004.09023v1 · Christian I. Johnson, Andrea K. Dupree, Mario Mateo et al.2020 · 29 citationsarXiv
Spectroscopy of LMC Cluster Stars1910.12922v1 · Andrea K. Dupree, Christian I. Johnson, Mario Mateo et al.2019 · 1 citationarXiv
The Globular Cluster Origin of the Milky Way Outer Bulge: Evidence from Sodium Bimodality1905.08809v1 · Young-Wook Lee, Jenny J. Kim, Christian I. Johnson et al.2019 · 19 citationsarXiv
Are the double-mode bulge RR Lyrae stars with identical period-ratios the relic of a disrupted stellar system?1905.03256v1 · Andrea Kunder, Alex Tilton, Dylon Maertens et al.2019 · 7 citationsarXiv
The Chemical/Dynamical Evolution of the Galactic Bulge1904.04393v1 · R. Michael Rich, Adam Burgasser, Will Clarkson et al.2019 · 1 citationarXiv
Light Element Discontinuities Suggest an Early Termination of Star Formation in the Globular Cluster NGC 6402 (M14)1903.01951v1 · Christian I. Johnson, Nelson Caldwell, R. Michael Rich et al.2019 · 19 citationsarXiv
LSST Cadence Optimization White Paper: The Definitive Map of the Galactic bulge1812.08670v1 · Oscar A. Gonzalez, Will Clarkson, Victor P. Debattista (UCLAN) et al.2018 · 3 citationsarXivon Valency
Radial velocities of RR Lyrae stars in and around NGC 64411802.09562v1 · Andrea Kunder, Arthur Mills, Joseph Edgecomb et al.2018 · 11 citationsarXiv
Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 65691801.10475v1 · Christian I. Johnson, R. Michael Rich, Nelson Caldwell et al.2018 · 28 citationsJohnson, C. I., Rich, R. M., Caldwell, N., et al., 2018, AJ, 155, 71
Occultations from an active accretion disk in a 72 day detached post-Algol system detected by K21801.06188v1 · G. Zhou, S. Rappaport, L. Nelson et al.2018 · 14 citationsarXiv
Light and Heavy Element Abundance Variations in the Outer Halo Globular Cluster NGC 62291709.00048v1 · Christian I. Johnson, Nelson Caldwell, R. Michael Rich et al.2017 · 24 citationsarXiv
NGC 1866: First Spectroscopic Detection of Fast Rotating Stars in a Young LMC Cluster1708.03386v1 · A. K. Dupree, A. Dotter, C. I. Johnson et al.2017 · 79 citationsarXiv
Chemical Complexity in the Eu-enhanced Monometallic Globular Cluster NGC 59861705.10840v1 · Christian I. Johnson, Nelson Caldwell, R. Michael Rich et al.2017 · 34 citationsarXiv
Crater 2: An Extremely Cold Dark Matter Halo1612.06398v1 · Nelson Caldwell (CfA), Matthew G. Walker (CMU), Mario Mateo (UM) et al.2016 · 127 citationsarXiv
A Chemical Composition Survey of the Iron-Complex Globular Cluster NGC 6273 (M 19)1611.05830v1 · Christian I. Johnson, Nelson Caldwell, R. Michael Rich et al.2016 · 46 citationsarXiv
Differences in the rotational properties of multiple stellar populations in M 13: a faster rotation for the "extreme" chemical subpopulation1610.09374v1 · M. J. Cordero, V. H'enault-Brunet, C. A. Pilachowski et al.2016 · 69 citationsarXiv
The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 63661606.08491v1 · Christian I. Johnson, Nelson Caldwell, R. Michael Rich et al.2016 · 22 citationsarXiv
Before the Bar: Kinematic Detection of A Spheroidal Metal-Poor Bulge Component1603.06578v1 · Andrea Kunder, R.M. Rich, J. Storm et al.2016 · 100 citationsarXiv
Chemical abundances in the multiple sub-giant branch of 47 Tucanae: insights on its faint sub-giant branch component1603.02012v1 · A. F. Marino, A. P. Milone, L. Casagrande et al.2016 · 45 citationsarXiv
EU Del: exploring the onset of pulsation-driven winds in giant stars1512.04695v1 · I. McDonald, A. A. Zijlstra, G. C. Sloan et al.2015 · 14 citationsarXiv
Evidence for a chemical enrichment coupling of globular clusters and field stars in the Fornax dSph1510.03880v1 · Benjamin Hendricks, Corrado Boeche, Christian I. Johnson et al.2015 · 16 citationsA&A 585, A86 (2016)
A Spectroscopic Analysis of the Galactic Globular Cluster NGC 6273 (M19)1507.00756v1 · Christian I. Johnson, R. Michael Rich, Catherine A. Pilachowski et al.2015 · 84 citationsarXiv
A comparative study of two 47 Tuc giant stars with different s-process enrichment1506.07874v1 · M. J. Cordero, C. J. Hansen, C. I. Johnson et al.2015 · 9 citationsarXiv
A high-velocity bulge RR Lyrae variable on a halo-like orbit1506.02664v1 · Andrea Kunder, R. Michael Rich, Keith Hawkins et al.2015 · 29 citationsarXiv
Career total: 220 works. 77 are in this corpus.Showing the 50 most recent.
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