Search Publications
Vector Magnetic Fields and Electric Currents From the Imaging Vector Magnetograph
van Ballegooijen, A. A.; Li, Jing; Mickey, Don
First, we describe a general procedure to produce high-quality vector magnetograms using the Imaging Vector Magnetograph (IVM) at Mees Solar Observatory. Two IVM effects are newly discussed and taken into account: (1) the central wavelength of the Fabry-Pérot is found to drift with time as a result of undiagnosed thermal or mechanical instabilitie…
NSCC—A New Scheme of Classification of C-Rich Stars Devised from Optical and Infrared Observations
de Araújo, F. X.; Lorenz-Martins, S.; De Mello, A. B. +2 more
A new classification system for carbon-rich stars is presented based on an analysis of 51 asymptotic giant branch carbon stars through the most relevant classifying indices available. The extension incorporated, which also represents the major advantage of this new system, is the combination of the usual optical indices that describe the photosphe…
Impacts of Source Properties on Strong Lensing by Rich Galaxy Clusters
Mao, S.; Kong, X.; Jing, Y. P. +2 more
We use a high-resolution N-body simulation to investigate the influence of background galaxy properties, including redshift, size, shape, and clustering, on the efficiency of forming giant arcs by gravitational lensing of rich galaxy clusters. Two large sets of ray-tracing simulations are carried out for 10 massive clusters at two redshifts, i.e.,…
Observation of Universality in the Generalized Similarity of Evolving Solar Wind Turbulence as Seen by Ulysses
Carbone, V.; Chapman, S. C.; Leonardis, E. +2 more
We perform statistical analysis of the fluctuating magnetic field observed in-situ by the Ulysses spacecraft, from the perspective of quantitative characterization of the evolving magnetohydrodynamic (MHD) turbulence. We focus on two successive polar passes around solar minimum which provide extended intervals of quiet, fast solar wind at a range …
The White Dwarf in EM Cygni: Beyond the Veil
Sion, Edward M.; Godon, Patrick; Barrett, Paul E. +1 more
We present a spectral analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectra of the eclipsing double-line spectroscopic binary EM Cygni (EM Cyg), a Z Cam DN system. The FUSE spectrum, obtained in quiescence, consists of four individual exposures (orbits): two exposures, at orbital phases phi ~ 0.65 and phi ~ 0.90, have a lower flux;…
Far-Ultraviolet Dust Albedo Measurements in the Upper Scorpius Cloud Using the Spinr Sounding Rocket Experiment
France, K.; Gordon, K. D.; Chakrabarti, S. +3 more
The Spectrograph for Photometric Imaging with Numeric Reconstruction sounding rocket experiment was launched on 2000 August 4 to record far-ultraviolet (912-1450 Å) spectral and spatial information for the giant reflection nebula in the Upper Scorpius region. The data were divided into three arbitrary bandpasses (912-1029 Å, 1030-1200 Å, and 1235-…
Analysis of Breit-Pauli Transition Probabilities for Lines in O III
Rubin, R. H.; Froese Fischer, C.; Tachiev, G. +1 more
Accurate atomic data are essential for understanding the properties of both O III lines produced by the Bowen fluorescence mechanism and [O III] forbidden lines observed in numerous gaseous nebulae. Improved Breit-Pauli transition probabilities have been published for the carbon sequence. Included were revised data for O III. The present paper ana…
D/H Along the Line of Sight of REJ 1738+665
Moos, H. W.; Dupuis, J.; Sonnentrucker, P. +2 more
We present a new D/H measurement along the sightline to REJ 1738+665, one of the hottest DA stars (T eff ~ 76,000 K, log g ~ 7.85), probing a line of sight in the direction (l = 96fdg89, b = 31fdg95) and extending over a path-length of ~243 pc. Hot DA stars are useful sources for mapping interstellar absorption because of the lack of me…
A Multi-Wavelength Investigation of the Unidentified Gamma-Ray Source HESS J1708-410
Funk, Stefan; Hinton, Jim; Van Etten, Adam
We report on recent XMM-Newton observations, archival radio continuum and CO data, and spectral energy distribution (SED) modeling of the unidentified Galactic plane source HESS J1708-410. No significant extended X-ray emission is observed, and we place an upper limit of 3.2 × 10-13 erg cm-2 s-1 in the 2-4 keV rang…
Clustering of Red Galaxies Around the z = 1.53 Quasar 3C 270.1
Wilkes, Belinda J.; Fazio, G. G.; Ashby, M. L. N. +6 more
In the paradigm of hierarchical galaxy formation, luminous radio galaxies mark mass assembly peaks that should contain clusters of galaxies. Observations of the z = 1.53 quasar 3C 270.1 with the Spitzer Space Telescope at 3.6-24 µm and with the 6.5 m MMT in the z' and Y bands allow the detection of potential cluster members via photometric r…