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- Goddard Space Flight CenterUS158 papers
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9 papers · 1 filter
Gravitoelectromagnetism and the Integral Formulation of MAxwell's Equations
D. Bini, C. Germani, R. T. Jantzen
The integral formulation of Maxwell's equations expressed in terms of an arbitrary observer family in a curved spacetime is developed and used to clarify the meaning of the lines o…
AD Leo from X-Rays to Radio: Are Flares Responsible for the Heating of Stellar Coronae?
M. Guedel, M. Audard, E. F. Guinan +4
In spring 1999, a long coordinated observing campaign was performed on the flare star AD Leo, including {\it EUVE}, {\it BeppoSAX}, the {\it VLA}, and optical telescopes. The campa…
An Ultraviolet Study of the Short-Period Binary OO Aquilae
Bruce J. Hrivnak, Edward F. Guinan, Laurence E. DeWarf +1
OO Aql is a rare W UMa-type eclipsing binary in which the two solar-type stars may have only recently evolved into contact. The binary has an unusually high mass ratio (0.84), and…
The Best Brown Dwarf Yet?: A Companion to the Hyades Eclipsing Binary V471 Tau
Edward F. Guinan, Ignasi Ribas
We have carried out an analysis of about 160 eclipse timings spanning over 30 years of the Hyades eclipsing binary V471 Tauri that shows a long-term quasi-sinusoidal modulation of…
A List of References on Spacetime Splitting and Gravitoelectromagnetism
Donato Bini, Robert T. Jantzen
Revised version to be published in the Proceedings of the Encuentros Relativistas Españoles, September, 2000 [ http://hades.eis.uva.es/EREs2000 ]
The Mg II and Lyman-alpha Lines of Nearby K Dwarfs: ISM Components and Flux Measurements
Brian E. Wood, Carol W. Ambruster, Alexander Brown +1
We analyze local ISM absorption observed in the Lyman-alpha and Mg II h & k lines of six nearby K dwarf stars, using UV spectra of these stars obtained with the Goddard High Resolu…