Christian I. Johnson

Contact Information:

University of California, Los Angeles
Division of Astronomy, PAB 3-548
430 Portola Plaza, PO BOX 951547
Los Angeles, CA 90095-1547

Phone: (310) 825-3845
Email: cijohnson[at]astro.ucla.edu

About Me: I am currently a National Science Foundation Astronomy and Astrophysics Postdoctoral Fellow
working with UCLA researcher R. Michael Rich on determining the detailed chemical composition of the
Milky Way bulge via high resolution spectroscopy. In addition to working on the Galactic bulge, I also employ
the techniques of stellar spectroscopy to understanding the formation and evolution of globular clusters.

Curriculum Vitae: CV

Refereed Publications:

Kunder, A., Rich, R. M., Johnson, C. I., De Propris, R., Chiappini, C., Gerhard, O., Martinez-Valpuesta, I., Martin, N., Ibata, R., Shen, J., & Li, Z.-Y., 2014, "APOGEE Post--Commissioning Bulge Radial Velocities: Where is the 200 km s-1 Cold Population Prominent?", ApJL, Submitted

Overbeek, J. C., Friel, E. D., Jacobson, H. R., Johnson, C. I., Pilachowski, C. A., & Meszaros, Sz., 2014, "NGC 7789: An Open Cluster Case Study", AJ, Submitted

Hendricks, B., Koch, A., Walker, M., Johnson, C. I., Penarrubia, J., & Gilmore, G., 2014, "Insights from the Outskirts: Chemical and Dynamical Properties in the outer parts of the Fornax Dwarf Spheroidal Galaxy", A&A, Submitted

Hsyu, T., Johnson, C. I., Lee, Y.-W., & Rich, R. M., 2014, "Light Element Chemistry and the Double Red Giant Branch in the Galactic Globular Cluster NGC 288", PASP, 126, 597

Johnson, C. I., Rich, R. M., Kobayashi, C., Kunder, A., & Koch, A., 2014, "Light, Alpha, and Fe-Peak Element Abundances in the Galactic Bulge", AJ, In Press

Cordero, M. J., Pilachowski, C. A., Johnson, C. I., & Vesperini, E., 2014, "Light-Element Abundances of Giant Stars in the Globular Cluster M71 (NGC 6838)", ApJ, submitted

Kacharov, N., Bianchini, P., Koch, A., Frank, M.J., Martin, N.F., Puzia, T.H., McDonald, I., Johnson, C. I., & Zijlstra, A.A., 2014, "A study of rotating globular clusters - the case of the old, metal poor globular cluster NGC 4372", A&A, 567, 69

Hendricks, B., Koch, A., Lanfranchi, G., Boeche, C., Walker, M., Johnson, C. I., Penarrubia, J., & Gilmore, G. 2014, ``The Metal-poor Knee in the Fornax Dwarf Spheroidal Galaxy", ApJ, 785, 102

Cordero, M. J., Pilachowski, C. A., Johnson, C. I., McDonald, I., Zijlstra, A. A., & Simmerer, J. 2014, "Detailed Abundances for a Large Sample of Giant Stars in the Globular Cluster 47 Tucanae (NGC 104)", ApJ, 780, 94

Johnson, C. I., McWilliam, A., & Rich, R. M. 2013, "Chemical Abundance Analysis of a Neutron-capture Enhanced Red Giant in the Bulge Plaut Field", ApJL, 775, 27

Johnson, C. I., Rich, R. M., Kobayashi, C., Kunder, A., Pilachowski, C. A., Koch, A., & de Propris, R. 2013, "Metallicity Distribution Functions, Radial Velocities, and Alpha Elements Abundances in Three Off-Axis Bulge Fields", ApJ, 765, 157

McDonald, I., Zijlstra, A. A., Rajoelimana, A., & Johnson, C. I. 2013, "On the Impossible NGC 4372 V1 and V2: an extended AGB to the [Fe/H]=-2.2 Cluster", MNRAS, 429L, 65

Johnson, C. I. & Pilachowski, C. A. 2012, "Oxygen and Sodium Abundances in M13 (NGC 6205) Giants: Linking Globular Cluster Formation Scenarios, Deep Mixing, and Post-RGB Evolution", ApJL, 754L, 38J

Geisler, D., Villanova, S., Carraro, G., Pilachowski, C., Cummings, J., Johnson, C. I., & Bresolin, F. 2012, "The Unique Na:O Abundance Distribution in NGC 6791: The First Open(?) Cluster with Multiple Populations", ApJL, 756L, 40G

Johnson, C. I., Rich, R. M., Kobayashi, C., & Fulbright, J. P. 2012, "Constraints on the Formation of the Galactic Bulge from Na, Al, and Heavy Element Abundances in Plaut's Field", ApJ, 749, 175

Kunder, A., Koch, A., Rich, R. M., de Propris, R., Howard, C. D., Stubbs, S. A., Johnson, C. I., Shen, J., Frinchaboy, P., Reitzel, D. B., Zhao, H., Wang, Y., & Kormendy, J. 2011, "The Bulge Radial Velocity Assay (BRAVA): II. Complete Sample and Data Release", AJ, 143, 57

O'Connell, J., Johnson, C. I., Pilachowski, C., & Burks, G. 2011, "Chemical Abundances of Red Giant Stars in the Globular Cluster M107 (NGC 6171)", PASP, 123, 1139

Gratton, R. G., Johnson, C. I., Lucatello, S., D'Orazi, V., & Pilachowski, C. 2011, "Multiple Populations in Omega Centauri: A Cluster Analysis of Spectroscopic Data", A&A, 534, A72

McDonald, I., Johnson, C. I., & Zijlstra, A. A. 2011, "Empirical Determination of the Integrated Red Giant and Horizontal Branch Stellar Mass Loss in Omega Centauri", MNRAS, 416, L6

McDonald, I., van Loon, J. Th., Sloan, G. C., Dupree, A. K., Zijlstra, A. A., Boyer, M. L., Gehrz, R. D., Evans, A., Woodward, C. E., & Johnson, C. I. 2011, "Spitzer Spectra of Evolved Stars in Omega Centauri and Their Low-Metallicity Dust Production", MNRAS, 417, 20

de Propris, R., Rich, R. M., Kunder, A., Johnson, C. I., Koch, A., Brough, S., Conselice, C. J., Gunawardhana, M., Palamara, D., Pimbblet, K., & Wijesinghe, D. 2011, "Separating the Conjoined Red Clump in the Galactic ulge: Kinematics and Abundances", ApJL, 732L, 36

Johnson, C. I., Rich, R. M., Fulbright, J. P., Valenti, E., & McWilliam, A. 2011, "Alpha Enhancement and the Metallicity Distribution Function of Plaut's Window", ApJ, 732, 108

Johnson, C. I. & Pilachowski, C. A. 2010, "Chemical Abundances for 855 Giants in the Globular Cluster Omega Centauri (NGC 5139)", ApJ, 722, 1373

Johnson, C. I., Pilachowski, C. A., Rich, R. M., & Fulbright, J. P. 2009, "A Large Sample Study of Red Giants in the Globular Cluster Omega Centauri (NGC 5139)", ApJ, 698, 2048

Haynes, S., Burks, G., Johnson, C. I. & Pilachowski, C. A. 2008, "Chemical Analysis of Five Red Giants in the Globular Cluster M10 (NGC 6254)", PASP, 120, 1097

Johnson, C. I., Pilachowski, C. A., Simmerer, J., & Schwenk, D. 2008, "Fe and Al Abundances for 180 Red Giants in the Globular Cluster Omega Centauri (NGC 5139)", ApJ, 681, 1505

Johnson, C. I. & Pilachowski, C. A. 2006, "A Moderate Sample Size, Multielement Analysis of the Globular Cluster M12 (NGC 6218)", AJ, 132, 2346

Johnson, C. I., Kraft, R. P., Pilachowski, C. A., Sneden, C., Ivans, I. I., & Benman, G. 2005, "A 235 Star Sample Sodium, Magnesium, and Aluminum Abundance Study in the Globular Clusters M3 (NGC 5272) and M13 (NGC 6205)", PASP, 117, 1308