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- Goddard Space Flight CenterUS158 papers
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13 papers · 1 filter
Circular Holonomy and Clock Effects in Stationary Axisymmetric Spacetimes
Donato Bini, Robert T. Jantzen, Bahram Mashhoon
Stationary axisymmetric spacetimes containing a pair of oppositely-rotating periodically-intersecting circular geodesics allow the study of various so-called `clock effects' by com…
Absolute dimensions of the M-type eclipsing binary YY Geminorum (Castor C): a challenge to evolutionary models in the lower main-sequence
Guillermo Torres, Ignasi Ribas
We present new spectroscopic observations of the detached late-type double-lined eclipsing binary YY Gem, a member of the Castor sextuple system and one of the benchmarks for the c…
The Cotton, Simon-Mars and Cotton-York Tensors in Stationary Spacetimes
Donato Bini, Robert T Jantzen, Giovanni Miniutti
The Cotton-York and Simon-Mars tensors in stationary vacuum spacetimes are studied in the language of the congruence approach pioneered by Hawking and Ellis. Their relationships wi…
A Systematic Spectroscopic X-Ray Study of Stellar Coronae with XMM-Newton: Early Results
M. Guedel, M. Audard, K. W. Smith +10
We have been conducting a comprehensive survey of stellar coronae with the XMM-Newton Reflection Grating Spectrometers during the commissioning, calibration, verification, and guar…
Hubble Space Telescope Spectroscopy of V471 Tauri: Oversized K Star, Paradoxical White Dwarf
M. Sean O'Brien, Howard E. Bond, Edward M. Sion
We have used the GHRS onboard the HST to obtain Lyman-alpha spectra of the hot white-dwarf (WD) component of the short-period eclipsing DA+dK2 pre-cataclysmic binary V471 Tauri, a…
Detection of Coronal Mass Ejections in V471 Tauri with the Hubble Space Telescope
Howard E. Bond, D. J. Mullan, M. Sean O'Brien +1
V471 Tauri, an eclipsing system consisting of a hot DA white dwarf (WD) and a dK2 companion in a 12.5-hour orbit, is the prototype of the pre-cataclysmic binaries. The late-type co…