Search Publications
UVBLUE: A New High-Resolution Theoretical Library of Ultraviolet Stellar Spectra
Chavez, M.; Rodríguez-Merino, L. H.; Buzzoni, A. +1 more
We present an extended ultraviolet-blue (850-4700 Å) library of theoretical stellar spectral energy distributions computed at high resolution, λ/Δλ=50,000. The UVBLUE grid, as we named the library, is based on LTE calculations carried out with ATLAS9 and SYNTHE codes developed by R. L. Kurucz and consists of nearly 1800 entries that cover a large …
EDisCS - the ESO distant cluster survey. Sample definition and optical photometry
Pelló, R.; White, S. D. M.; Bremer, M. +23 more
We present the ESO Distant Cluster Survey (EDisCS), a survey of 20 fields containing distant galaxy clusters with redshifts ranging from 0.4 to almost 1.0. Candidate clusters were chosen from among the brightest objects identified in the Las Campanas Distant Cluster Survey, half with estimated redshift z_est∼0.5 and half with z_est∼0.8. They were …
The Nonpotentiality of Active-Region Coronae and the Dynamics of the Photospheric Magnetic Field
Title, Alan M.; Schrijver, Carolus J.; Metcalf, Thomas R. +1 more
The magnetic field in the solar photosphere frequently carries strong electric currents, even though the global coronal configuration often resembles a potential field ringed by the heliospheric current sheet. To understand this, we compare TRACE EUV images of active-region coronae and potential-field source-surface extrapolations based on SOHO MD…
Disentangling the composite continuum of symbiotic binaries. I. S-type systems
Skopal, A.
We describe a method of disentangling the composite, 0.12-5 µm continuum of symbiotic binaries. The observed SED is determined by the IUE/HST archival spectra and flux-points corresponding to the optical UBVRI and infrared JHKLM photometric measurements. The modeled SED is given by superposition of fluxes from the cool giant, hot stellar sou…
Molecular hydrogen emission from protoplanetary disks
Nomura, H.; Millar, T. J.
We have modeled self-consistently the density and temperature profiles of gas and dust in protoplanetary disks, taking into account irradiation from a central star. Making use of this physical structure, we have calculated the level populations of molecular hydrogen and the line emission from the disks. As a result, we can reproduce the observed s…
Abundance Profiles and Kinematics of Damped Lyα Absorbing Galaxies at z < 0.651,
Chen, Hsiao-Wen; Rauch, Michael; Kennicutt, Robert C., Jr.
We present a spectroscopic study of six damped Lyα absorption (DLA) systems at z<0.65, based on moderate- to high-resolution spectra of the galaxies responsible for the absorbers. Combining known metallicity measurements of the absorbers with known optical properties of the absorbing galaxies, we confirm that the low metal content of the DLA po…
Chandra Detection of the First X-Ray Forest along the Line of Sight To Markarian 421
Elvis, Martin; Marshall, Herman; Nicastro, Fabrizio +7 more
We present the first >=3.5 (conservative) or >=5.8 σ (sum-of-lines significance) detection of two warm-hot intergalactic medium (WHIM) filaments at z>0, which we find along the line of sight to the blazar Mrk 421. These systems are detected through highly ionized resonant metal absorption in high-quality Chandra ACIS and HRC Low Energy Tr…
Absolute dimensions of detached eclipsing binaries - I. The metallic-lined system WW Aurigae
Maxted, P. F. L.; Southworth, J.; Claret, A. +2 more
WW Aurigae is a detached eclipsing binary composed of two metallic-lined A-type stars orbiting each other every 2.5 d. We have determined the masses and radii of both components to accuracies of 0.4 and 0.6 per cent, respectively. From a cross-correlation analysis of high-resolution spectra we find masses of 1.964 +/- 0.007 Msolar for t…
Propagation of the 12 May 1997 interplanetary coronal mass ejection in evolving solar wind structures
Arge, C. N.; Odstrcil, D.; Pizzo, V. J.
Recently, we simulated the 12 May 1997 coronal mass ejection (CME) event with a numerical three-dimensional magnetohydrodynamic model (Odstrcil et al., 2004), in which the background solar wind was determined from the Science Applications International Corporation (SAIC) coronal model (Riley et al., 2001) and the transient disturbance was determin…
Morphological differences between Saturn's ultraviolet aurorae and those of Earth and Jupiter
Kim, J.; Hill, T.; Crary, F. +10 more
It has often been stated that Saturn's magnetosphere and aurorae are intermediate between those of Earth, where the dominant processes are solar wind driven, and those of Jupiter, where processes are driven by a large source of internal plasma. But this view is based on information about Saturn that is far inferior to what is now available. Here w…