Journal Publications
2022
Kathryn V. Lester, Gail H. Schaefer, Francis C. Fekel, Douglas R. Gies, Todd J. Henry, Wei-Chun Jao, Leonardo A. Paredes, Hodari-Sadiki Hubbard-James, Christopher D. Farrington, Kathryn D. Gordon, S. Drew Conjnowski, John D. Monnier, Stefan Kraus, Jean-Baptiste Le Bouquin, Narsireddy Anugu, Theo Ten Brummelaar, Claire L. Davies, Tyler Gardner, Aaron labdon, Cyprien Lanthermann, Benjamin R. Setterholm
[2022, Astron. J., 164, 228]
An Analysis of the Eclipsing Binaries HD 71636, V1022~Cassiopeiae, and OT Andromedae
Francis C. Fekel, Gregory W. Henry, James R. Sowell, Ethan R. Partington, Joanna M. Wedemeyer, ArjunSinh Nakum
[2022, Astron. J., 164, 224]
ARMADA II: Further Detections of Inner Companions to Intermediate Mass Binaries with Micro-arcsecond Astrometry at CHARA and VLTI
Tyler Gardner, John D. Monnier, Francis C. Fekel, Jean-Baptiste Le Bouquin, Adam Scovera, Gail Schaefer, Stefan Kraus, Fred C. Adams, Narsireddy Anugu, Jean-Philippe Berger, Theo Ten Brummelaar, Claire L. Davies, Jacob Ennis, Doublas R. Gies, Keith J. C. Johnson, Pierre Kervella, Kaitlin M. Kratter, Aaron Labdon, Cyprien Lanthermann, Johannes Sahlmann, Benjamin R. Setterholm
[2022, Astron. J., 164, 184]
Nine Bright gamma Doradus Variables Discovered with Ground-based Photometry
Gregory W. Henry, Francis C. Fekel, Michael H. Williamson
[2022, Astron. J., 163, 180]
2021
Tyler Gardner, John D. Monnier, Francis C. Fekel, Michael Williamson, Fabien Baron, Sasha Hinkley, Michael Ireland, Adam L. Kraus, Stefan Kraus, Rachael M. Roettenbacher, Gail Schaefer, Judit Sturmann, Laszio Sturmann, Theo Ten Brummelaar
[2021, Astrophys. J. 921, 41]
Observations with the Differential Speckle Survey Instrument. X. Preliminary Orbits of K-dwarf Binaries and Other Stars
Elliott P. Horch, Kyle G. Broderick, Dana I. Casetti-Dinescu, Todd J. Henry, Francis C. Fekel, Matthew W. Muterspaugh, Daryl W. Willmarth, Jennifer G. Winters, Gerald T. van Belle, Catherine A. Clark, Mark E. Everett
[2021, Astron. J. 161, 295]
ARMADA. I. Triple Companions Detected in B-type Binaries alpha Del and nu Gem
Tyler Gardner, John D. Monnier, Francis C. Fekel, Gail Schaefer, Keith J. C. Johnson, Jean-Baptiste Le Bouquin, Stefan Kraus, Narsireddy Anugu, Benjamin R. Setterholm, Aaron Labdon, Claire L. Davies, Cyprien Lanthermann, Jacob Ennis, Michael Ireland, Kaitlin M. Kratter, Theo Ten Brummelaar, Judit Sturmann, Laszlo Sturmann, Chris Farrington, Doublas R. Gies, Robert Klement, Fred C. Adams
[2021, Astron. J., 161, 40]
2020
Kenneth H. Hinkle, Thomas Lebzelter, Francis C. Fekel, Oscar Straniero, Richard R. Joyce, Lisa Prato, Nicole Karnath, Nolan Habel
[2020, Astrophys. J., 904, 143]
Visual Orbits of Spectroscopic Binaries with the CHARA Array. III. HD 8374 and HD 24546
Kathryn V. Lester, Francis C. Fekel, Matthew Muterspaugh, Douglas R. Gies, Gail H. Schaefer, Christopher D. Farrington, Zhao Guo, Rachel A. Matson, John D. Monnier, Theo ten Brummelaar, Judit Sturmann, Samuel A. Weiss
[2020, Astron J., 160, 58]
KR Persei, A Mid-F Eclipsing Binary with a One-day Period
James R. Sowell, Emily Hollingsworth, Francis C. Fekel, Matthew W. Muterspaugh, Horace Dale, Alexander D. Savello, Jeffrey L. Coughlin, Richard M. Williamon
[2020, Astron J., 160, 13]
Absolute Dimensions of the Early-F Eclipsing Binary BT Vulpeculae
Guillermo Torres, Claud H. Sandberg Lacy, Francis C. Fekel, Matthew W. Muterspaugh
[2020, Astrophys. J., 894, 96]
Observations of Binary Stars with the Differential Speckle Survey Instrument. IX. Observations of Known and Suspected Binaries, and a Partial Survey of Be Stars
Elliott P. Horch, Gerard T. van Belle, James W. Davidson, Jr., Daryl W. Willmarth, Francis C. Fekel, Matthew Muterspaugh, Dana I. Casetti-Dinescu, Frederick W. Hahne, Nicole M. Granucci, Catherine Clark, Jennifer G. Winters, Justin D. Rupert, Samuel A. Weiss, Nicole M Colton, Daniel A. Nusdeo, Todd J. Henry
[2020, Astron. J., 159, 233]
35,000 Radial Velocities for 348 Stars from the Tennessee State University Automatic Spectroscopic Telescope
Joel A. Eaton
[2020, JAAVSO, 48, 91]
2019
Francis C. Fekel, Gregory W. Henry, James R. Sowell
[2019, Astron. J., 158, 189]
Absolute Dimensions of the Early-F Eclipsing Binary V506 Oph
Guillermo Torres, Claud H. Sandberg Lacy, Francis C. Fekel, Matthew W. Muterspaugh
[2019, Astrophys. J., 876, 41]
Infrared Spectroscopy of Symbiotic Stars. XII. The Neutron Star SyXB System 4U 1700+24 = V934 Herculis
Kenneth H. Hinkle, Francis C. Fekel, Richard R. Joyce, Joanna Mikolajewska, Cezary Galan, Thomas Lebzelter
[2019, Astrophys. J., 872, 43]
2018
C. D. Farrington, Francis C. Fekel, G. H. Schaefer, T. A. ten Brummelaar
[2018, Astron J. 156, 144]
Spectroscopic Orbits for Late-Type Stars. II.
Francis C. Fekel, Daryl W. Willmarth, Helmut A. Abt, Dimitri Pourbaix
[2018, Astron. J., 156, 117]
Precision Orbit of δ Delphini and Prospects for Astrometric Detection of Exoplanets
Tyler Gardner, John D. Monnier, Francis C. Fekel, Mike Williamson, Douglas K. Duncan, Timothy R. White, Michael Ireland, Fred C. Adams, Travis Barman, Fabien Baron, Theo ten Brummelaar, Xiao Che, Daniel Huber, Stefan Kraus, Rachel M. Roettenbacher, Gail Schaefer, Judit Sturmann, Laszlo Sturmann, Samuel J. Swihart, Ming Zhao
[2018, Astrophys. J., 855, 1]
2017
G. Torres, C.H.S. Lacy, F.C. Fekel, M. Wolf, M.W. Muterspaugh
[2017, Astrophy. J., 846, 115]
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. X. HD 96511, HR 7578, and KZ Andromedae
Francis C. Fekel, Gregory W. Henry, Jocelyn Tomkin
[2017 Astron. J., 154, 120]
Kepler sheds new and unprecedented light on the variability of a blue supergiant: gravity waves in the O9.5Iab star HD 188209
C. Aerts, S. Simon-Diaz, S. Bloemen, J. Debosscher, P. Papics, S. Bryson, M. Still, E. Moravveji, M.H. Williamson, F. Grundahl, M. Fredslund Anderson, V. Antoci, P.L. Palle, J. Christensen-Dalsgaard, and T.M. Rogers
[2017, Astronomy & Astrophysics (accepted)]
2016
Richard Williamon, Horace Dale, Charles L. Evavold, Alexander Langoussis, Francis C. Fekel, Matthew W. Muterspaugh, Stephen Williams, Kate Napier, and James R. Sowell
[2016, PASP, 128:124202]
Very Low-Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS VI: A Giant Planet and a Brown Dwarf Candidate in a Close Binary System HD 87646
Bo Ma, Jian Ge, Alex Wolszczan, Matthew W. Muterspaugh, Brian Lee, Greg Henry, Donald P. Schneider, Eduardo L. Martin, Andrzej Niedzielski, Jiwei Xie, Scott W. Fleming, Neil Thomas, Michael Williamson, Zhaohuan Zhu, Eric Agol, Dmitry Bizyaev, Luiz Nicolaci da Costa, Peng Jiang, A.F. Martinez Fiorenzano, Jonay I. Gonzalez Hernandez, Pengcheng Guo, Nolan Grieves, Rui Li, Jane Liu, Suvrath Mahadevan, Tsevi Mazeh, Duy Cuong Nguyen, Martin Paegert, Sirinrat Sithajan, Keivan Stassun, Sivarani Thirupathi, Julian C. van Eyken, Xiaoke Wan, Ji Wang, John P. Wisniewski, Bo Zhao, Shay Zucker
[2016, Astron. J., (submitted)]
Absolute Properties of the Pre-Main-Sequence Eclipsing Binary Star NP Persei
Claud H. Sandberg Lacy, Francis C. Fekel, Kresimir Pavlovski, Guillermo Torres, and Matthew W. Muterspaugh
[2016, Astron. J., 152, 2]
The Spectroscopic Orbits of Five Gamma Doradus Stars
Francis C. Fekel, Gregory W. Henry, and Dimitri Pourbaix
[2016, Astron. J., 151, 26]
Spectroscopic Orbits for 15 Late-Type Stars
Daryl W. Willmarth, Francis C. Fekel, Helmut A. Abt, and Dimitri Pourbaix
[2016, Astron. J., Volume 152, Number 2, Article 46]
2015
Rachael M. Roettenbacher, John D. Monnier, Francis C. Fekel, Gregory W. Henry, Heidi Korhonen, David W. Latham, Matthew W. Muterspaugh, Michael H. Williamson, Fabien Baron, Theo A. Ten Brummelaar, Xiao Che, Robert O. Harmon, Gail H. Schaefer, Nicholas J. Scott, Judit Sturmann, Laszlo Sturmann, and Nils H. Turner
[2015, Astrophys. J., 809, 159]
Detecting the Companions and Ellipsoidal Variations of RS CVn Primaries. I. Sigma Geminorum
Rachael M. Roettenbacher, John D. Monnier, Gregory W. Henry, Francis C. Fekel, Michael H. Williamson, and 15 others
[2015, Astrophys. J., 807, 23]
HD 207651, A Composite Spectrum Triple System
F.C. Fekel
[2015, Astron. J., 149, 83]
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. IX. HD 54371, HR 2692, 16 Ursa Majoris
F.C. Fekel, M.H. Williamson, M.W. Muterspaugh, D. Willmarth, D. Pourbaix
[2015, Astron. J., 149, 63]
Absolute Properties of the Eclipsing Binary Star IM Persei
C.H.S. Lacy, G. Torres, F.C. Fekel, M.W. Muterspaugh, and J. Southworth
[2015, Astron. J., 149, 34]
2014
C.H.S. Lacy and F.C. Fekel
[2014, Astron. J. 148, 71]
The Pulsation Amplitude of the Cepheid Polaris Continues to Increase
D.E. Mkrtichian, H. Brunt, Byeong-Cheol Lee, J. Eaton, M. Williamson, F. Fekel, N. Evans, and I. Han
[2014, ASP Conference Series, Vol. 482]
Absolute Properties of the Eclipsing Binary Star AP Andromedae
C.H.S. Lacy, G. Torres, F.C. Fekel, M.W. Muterspaugh
[2014, Astron. J., 147, 148](arXiv)
The Orbit of the Triple-star System 1 Geminorum from Phases Differential Astrometry and Spectroscopy
B.F. Lane, M.W. Muterspaugh, R.F. Griffin, C.D. Scarfe, F.C. Fekel, M.H. Williamson, J.A. Eaton, M. Shao, M.M. Colavita, M. Konacki
[2014, Astrophys. J., 783, 3](pdf)
Orbital Solutions and Absolute Elements of the Eclipsing Binary ES Librae
N.E. Cabrera, J.R. Sowell, R.M. Williamon, T.F Collins, F.C Fekel, M.H. Williamson, and M.W. Muterspaugh
[2014, PASP, 126, 121]
2013
A.Sodor, P. De Cat, D. Wright, C. Neiner, M. Briquet, P. Lampens, R.J. Dukes, F.C. Fekel, G.W. Henry, M.H. Williamson, M.W. Muterspaugh, E. Brunsden, K. Pollard, P.L. Cottrell, F. Maisonneuve, P. Kilmartin, J. Matthews, T. Kallinger, P.G. Beck, E. Kambe, C.A. Engelbrecht, R.J. Czanik, S. Yang, O. Hashimoto, S. Honda, J.N. Fu, B. Castanheira, H. Lehmann, N. Behara, S. Scaringi, H. Van Winkel, J. Menu, A. Lobel, P. Mathias, S. Saesen, M. Vuckovic
[2013, Monthly Notices of the Royal Astronomical Society, submitted]
New Precision Orbits of Bright Double-Lined Spectroscopic Binaries. VIII. HR 1528, HR 6993, 2 Sagittae, and 18 Vulpeculae
F.C. Fekel, J. Tomkin, M.H. Williamson
[2013, Astron. J., 146, 129](IOP)
The Spectroscopic Orbits of Five Solar Type, Single Lined Binaries
F.C. Fekel, S. Rajavi, M.W. Muterspaugh, and M.H. Williamson
[2013, Astron. J., 145, 111]
Absolute Properties of the Eclipsing Binary VV Corvi
F.C. Fekel, G.W. Henry, and J.R. Sowell
[2013, Astron. J., 146, 146]
The spectroscopic orbit of the K-giant binary γ Canis Minoris
Francis C. Fekel, Michael H. Williamson, Michael Weber, Klaus G. Strassmeier, Dimitri Pourbaix
[2013, Astronomische Nachrichten, 3, 223](ps)
2012
Claud H. Sandberg Lacy, Francis C. Fekel, and Antonion Claret
[2012, AJ, 144:63](pdf)
A Single-mode Echelle Spectrograph: Eliminating Modal Variation, Enabling Higher Precision Doppler Study
Askari Ghasempour, John Kelly, Matthew W. Muterspaugh, Michael H. Williamson
[2012, ](pdf)
Asteroseismology of the nearby SN-II progenitor: Rigel
Part 1: The MOST high precision photometry and radial velocity monitoring
Ehsan Moravveji, Edward F. Guinan, Matt Shultz, Michael H. Williamson, and Andres Moya
[2012, arXiv:1201.0843v1 [astro-ph.SR]](pdf)
Third Component Search and Abundances of the Very Dusty, Short-Period Binary BD+20 307
Francis C. Fekel, Maria J. Cordero, Raphael Galicher, B. Zuckerman, Carl Melis, and Alicia J. Weinberger
[2012, ApJ, 749, 7]
Absolute Properties of the Eclipsing Binary Star BF Draconis
Claud Lacy, Guillermo Torres, Francis C. Fekel, Jeffrey A. Sabby, and Antonio Claret
[2012, AJ, 143, 129]
2011
Claud H. Sandberg Lacy, Francis C. Fekel
[2011, AJ, 142, 185]
The Real Orbital Period of the Double-Lined Spectroscopic Binary HD 31738
Francis C. Fekel and Roger F. Griffin
[2011, The Observatory, v131, 283]()
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. VII. 47 Andromedae, 38 Cassiopeiae, and HR 8467
Francis C. Fekel, Jocelyn Tomkin, Michael H. Williamson, and Dimitri Pourbaix
[2011, AJ, 142, 69]()
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. VI. HD 24623 and V923 Scorpii
Francis C. Fekel, Michael H. Williamson, and Gregory W. Henry
[2011, AJ, 141, 145]()
2010
The Triple Star Systems 63 Gem A and HR 2896
Matthew W. Muterspaugh, Francis C. Fekel, Benjamin F. Lane, William I. Hartkopf, S. R. Kulkarni, Maciej Konacki, Bernard F. Burke, M. M. Colavita, M. Shao, and M. Williamson
[2010, AJ, 140, 1646]
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. V. The Am Stars HD 434 and 41 Sextantis
Francis C. Fekel and Michael H. Williamson
[2010, AJ, 140, 1381]()
New Precision Orbits of Bright Double-lined Spectroscopic Binaries. IV. 66 Andromedae, HR 6979, and HR 9059
Francis C. Fekel, Jocelyn Tomkin, and Michael H. Williamson
[2010, AJ, 139, 1579](pdf)
2009
Francis C. Fekel, Jocelyn Tomkin, and Michael H. Williamson
[2009, AJ, 137, 3900](pdf)
Asteroseismology of Hybrid Pulsators Made Possible: Simultaneous MOST Space Photometry and Ground-Based Spectroscopy of &gamma Peg
G. Handler, J. M. Matthews, J. A. Eaton, J. Daszyńska-Daszkiewicz, R. Kuschnig, H. Lehmann, E. Rodríguez, A. A. Pamyatnykh, T. Zdravkov, P. Lenz, V. Costa, D. Díaz-Fraile, A. Sota, T. Kwiatkowski, A. Schwarzenberg-Czerny, W. Borczyk, W. Dimitrov, M. Fagas, K. Kamiński, A. Roźek, F. van Wyk, K. R. Pollard, P. M. Kilmartin, W. W. Weiss, D. B. Guenther, A. F. J. Moffat, S. M. Rucinski, D. D. Sasselov, and G. A. H. Walker
[2009, AJ, 698, L56](pdf)
2008
Joel A. Eaton, Gregory W. Henry, and Andrew P. Odell
[2008, ApJ, 679, 1490](pdf),
Spurious Eccentricities of Distorted Binary Components
Joel A. Eaton
[2008, ApJ, 681, 562](pdf),
Polaris the Cepheid Returns: 4.5 Years of Monitoring from Ground and Space
H. Bruntt, N. R. Evans, D. Stello, A. J. Penny, J. A. Eaton, D. L. Buzasi, D. D. Sasselov, H. L. Preston, and E. Miller-Ricci
[2008, AJ, 683, 433](pdf),
Planetary Systems around Close Binary Stars: the Case of the Very Dusty, Sun-like, Spectroscopic Binary BD+20 307
B. Zuckerman, Francis C. Fekel, Michael H. Williamson, Gregory W. Henry, and M. P. Muno
[2008, ApJ, 688, 1345](pdf),
2007
Joel A. Eaton and Gregory W. Henry
[2007, PASP, 119, 259](pdf),
Starspots and relativity: Applied Doppler imaging for the Gravity Probe B mission
Marsden, S.C., Berdyugina, S.V., Donati, J.-F., Eaton, J.A., Williamson, M.H.
[2007, Astronomische Nachrichten, 328, 1047](pdf),
The Spectroscopic and Astrometric Orbits of HR 672
Francis C. Fekel, Michael H. Williamson, and D. Pourbaix
[2007, AJ, 133, 2431](pdf),
Properties of the &zeta Aur-Type Binary System 22 Vul = QS Vul
Joel A. Eaton and Felecia G. Shaw
[2007, AJ, 133, 2669](pdf)
The Tennessee State University Automatic Spectroscopic Telescope: Data Processing and Velocity Variation of Cool Giants
Joel A. Eaton and Michael H. Williamson
[2007, PASP, 119, 886](pdf)
Chromospherically Active Stars. XXVI. The Double-Lined Late-Type Binary HD 19485 = WZ Arietis
Francis C. Fekel and C. T. Bolton
[2007, AJ, 134, 2079](pdf)
The Orbits of the Quadruple Star System 88 Tauri A from PHASES Differential Astrometry and Radial Velocity
Benjamin F. Lane, Matthew W. Muterspaugh, Francis C. Fekel, Michael Williamson, Stanley Browne, Maciej Konacki, Bernard F. Burke, M. M. Colavita, S. R. Kulkarni, and M. Shao
[2007, AJ, 669, 1209](pdf)
2006
Fekel, F.C., Willimson, M.H.,Buggs, C., Onuohu, G., and Smith, B.
[2006, AJ, 132, 1490](pdf)
2005
Gregory W. Henry and Francis C. Fekel
[2005, AJ, 129, 2026](pdf)
A Sun in the Spectroscopic Binary IM Pegasi, the Guide Star for the Gravity Probe B Mission
S. C. Marsden, S. V. Berdyugina, J.-F. Donati, J. A. Eaton, M. H. Williamson, I. Ilyin, D. A. Fischer, M. Muñoz, H. Isaacson, M. I. Ratner, M. Semel, P. Petit, and B. D. Carter
[2005, ApJ, 634, L173](pdf)
2004
Joel A. Eaton and Michael H. Williamson
[2004, Astronomische Nachrichten, 325, 522](pdf)