Bradford J. Wargelin

Smithsonian Astrophysical Observatory
60 Garden Street, MS-70, Cambridge, MA 02138
bwargelin [at] // (617) 496-7702 // office B-305


1993 Ph.D. Physics, University of California, Berkeley
1985 S.B. Physics, Massachusetts Institute of Technology

Professional History

2016-present X-Ray Surveyor (XRS) Science & Technology Definition Team: Stellar Cycles
2009 International X-ray Observatory (IXO) Science Team Associate
2008-2009 Generation-X (Gen-X) Facility Science Team: Planets, Stars, and the Galaxy
2008 Constellation-X (Con-X) Facility Science Teams: Solar System, Planet Formation, and Evolution
   • MHD Physics in Stellar Environments • Plasma Diagnostics and Atomic Astrophysics
1998-present Chandra X-Ray Center Calibration Scientist, Smithsonian Astrophysical Observatory
1993-1998 AXAF Ground Calibration Scientist, Smithsonian Astrophysical Observatory

Recent Research Awards

2017 PI, "Proxima Centauri's Stellar Cycle," Swift Guest Investigator/Cycle 13
2017 PI, "The Stellar Cycle of Proxima Centauri," XMM Guest Observer/Cycle 16
2016 PI, "Proxima Cen's Stellar Cycle," Chandra Director's Discretionary Time/Cycle 18
2016 PI, Proxima Cen monitoring, Swift TOO observations/Cycle 12
2013 PI, "3D Modeling of Solar Wind Charge Exchange X-ray Emission," Smithsonian Competitive Grants Program for Science
2012 PI, "Measuring Proxima Cen's Rotation Period and Possible Stellar Cycle," Swift Guest Investigator & TOO/Cycle 8
2010 PI, "Chandra Deep Field-South: Solar Wind Charge Exchange and the SXRB," Chandra Archive/Cycle 12
2009 PI, "Stellar Cycles and Rotation Periods of M Dwarfs," Swift Guest Investigator/Cycle 5

General Fields of Interest

Laboratory X-ray astrophysics: High-resolution spectroscopy, electron impact excitation, charge exchange
High-energy astrophysics: Stellar coronae, solar wind charge exchange, soft X-ray background, local ISM
Solar/stellar astrophysics: Stellar cycles and winds, interaction of winds and planetary atmospheres

Selected Publications

  • "Optical, UV, and X-Ray Evidence for a 7-year Stellar Cycle in Proxima Centauri,"
    B.J. Wargelin, S.H. Saar, G. Pojmański, J.J. Drake, and V.L. Kashyap,
    MNRAS, 464, 3281 (2017)

  • "Observation and Modeling of Geocoronal Charge Exchange X-Ray Emission During Solar Wind Gusts,"
    B.J. Wargelin, M. Kornbleuth, P.L. Martin, and M. Juda,
    Astrophys. J., 796, 28 (2014)

  • "Solar Wind Charge Exchange Emission in the Chandra Deep Field North,"
    J.D. Slavin, B.J. Wargelin, and D. Koutroumpa,
    Astrophys. J., 779, 13 (2013)

  • "X-Ray Flaring on the dMe Star, Ross 154,"
    B.J. Wargelin, V.L. Kashyap, J.J. Drake,
    D. García-Alvarez, and P.W. Ratzlaff,
    Astrophys. J., 676, 610 (2008)

  • "EBIT Charge-Exchange Measurements and Astrophysical Applications,"
    B.J. Wargelin, P. Beiersdorfer, and G.V. Brown,
    Can. J. Physics, 86, 151 (2008)

  • "Charge Exchange Spectra of Hydrogenic and He-like Iron,"
    B.J. Wargelin, P. Beiersdorfer, P.A. Neill, R.E. Olson, and J.H. Scofield,
    Astrophys. J., 634, 687 (2005)

  • "Chandra Observations of the Dark Moon and Geocoronal Solar-Wind Charge Transfer,"
    B.J. Wargelin, M. Markevitch, M. Juda, V. Kharchenko, R. Edgar, and A. Dalgarno,
    Astrophys. J., 607, 596 (2004)