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Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer
Ge, Jian; Mahadevan, Suvrath; Fleming, Scott W. +5 more
We demonstrate the ability to measure precise stellar barycentric radial velocities with the dispersed fixed-delay interferometer technique using the Exoplanet Tracker (ET), an instrument primarily designed for precision differential Doppler velocity measurements using this technique. Our barycentric radial velocities, derived from observations ta…
XTE J1901+014—the first low-mass Fast X-ray transient?
Lutovinov, A. A.; Karasev, D. I.; Burenin, R. A.
We continue to study the fast X-ray transient XTE J1901+014 discovered in 2002 by the RXTE observatory, whose nature has not yet been established. Based on the XMM-Newton observations of the source in 2006, we have obtained its energy spectrum, light curves, and power spectrum in the energy range 0.5 10 keV, which are in good agreement with our re…
The dynamics of the solar radiative zone
Turck-Chièze, Sylvaine; Talon, Suzanne
The picture of the solar radiative zone is evolving quickly. This review is separated in two parts. We first recall how the two powerful probes of the solar interior, namely the neutrinos and helioseismology have scrutinized the microscopic properties of the solar radiative plasma. Recent observations stimulate today complementary activities beyon…
The Funnel Geometry of Open Flux Tubes in the Low Solar Corona Constrained by O VI and Ne VIII Outflow
Lie-Svendsen, Øystein; Esser, Ruth; Byhring, Hanne S.
We carry out model calculations to show that observed outflow velocities of order 7-10 km s-1 of C IV and O VI ions, and 15-20 km s-1 of Ne VIII ions, are not only consistent with models of the solar wind from coronal holes but also place unique constraints on the degree of flow tube expansion as well as the location of the e…
Analysis of the FUSE Spectrum of the Hot, Evolved Star GD 605
Chayer, P.; Fontaine, G.; Wesemael, F. +2 more
We present an analysis of the atmospheric properties of the evolved, hydrogen-rich object GD 605 using FUSE, IUE, and optical spectra in conjunction with non-LTE (NLTE) model atmospheres and synthetic spectra. We also present an analysis of the interstellar medium along the line of sight toward this star. Our effective temperature determination re…
Unusual stripes in emission and absorption in solar radio bursts: Ropes of fibers in the meter wave band
Chernov, G. P.
Based on data from the spectrographs of IZMIRAN and Tremsdorf station (Astronomical Institute, Potsdam), we analyze the ropes of narrow-band fibers in the spectra of solar radio bursts in the meter wave band by invoking events of satellite data (SOHO/LASCO, EIT, MDI) for the analysis. We consider in detail basic properties of the ropes in four eve…
Cosmic Ray Transport and Production in the Galaxy: A Stochastic Propagation Simulation Approach
Zhang, Ming; Connell, J. J.; Rassoul, Hamid +1 more
Galactic cosmic-ray composition reflects the effects of nuclear interactions during propagation through the interstellar medium. In order to use measurements to determine the source of cosmic rays, one needs a model to deconvolute the propagation effect. This paper presents a new numerical method to solve cosmic-ray diffusive transport equations w…
OB stars in the Tycho-2 and 2MASS catalogues
Gontcharov, G. A.
The Tycho-2 proper motions and five-band Tycho-2 and 2MASS photometry for approximately 2.5 million common stars have been used to select OB stars and to determine the extinction and photometric distance for each of them. We have selected 37 485 stars and calculated their reddenings based on their positions in the two-color V T - H, J-…
Cluster observations on the thin current sheet in the magnetotail
Dandouras, I.; Rème, H.; Cao, J. B. +3 more
A magnetotail event on 15 September 2001 is analyzed, during which the Cluster spacecraft observed both embedding and bifurcation of the Thin Current Sheet (TCS). It is indicated that the ion anisotropy and nongyrotropy are responsible for those new equilibrium features that represent deviations from the conventional Harris model. Measurements sho…
Multi-Spacecraft Methods of Wave Field Characterisation
Glassmeier, Karl-Heinz; Pinçon, Jean-Louis
Space plasmas are collisionless and thus waves play a major role in the collective interaction between particles. Also, space plasmas are subject to a variety of instabilities, generating a plethora of different plasma wave modes. Thus, for many physical processes the role of waves and turbulence is likely to be predominant. The simultaneous four-…