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Evolution of the electronic excitation spectrum with strongly diminishing hole-density in superconducting Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}
J. W. Alldredge, Jinho Lee, K. McElroy +8
A complete knowledge of its excitation spectrum could greatly benefit efforts to understand the unusual form of superconductivity occurring in the lightly hole-doped copper-oxides.…
2MASS Galaxies in the Fornax Cluster Spectroscopic Survey
R. A. H. Morris, S. Phillipps, J. B. Jones +5
The Fornax Cluster Spectroscopic Survey (FCSS) is an all-object survey of a region around the Fornax Cluster of galaxies undertaken using the 2dF multi-object spectrograph on the A…
Star Formation at Zero and Very Low Metallicities
Jonathan C. Tan, Christopher F. McKee
We describe how star formation is expected to proceed in the early metal-free Universe, focusing on the very first generations of stars. We then discuss how the star formation proc…
Spots, plages, and flares on lambda Andromedae and II Pegasi
A. Frasca, K. Biazzo, G. Tas +2
We present the results of a contemporaneous photometric and spectroscopic monitoring of lambda And and II Peg aimed at investigating the behavior of surface inhomogeneities in the…
An Ammonia Spectral Atlas of Dense Cores in Perseus
E. W. Rosolowsky, J. E. Pineda, J. B. Foster +5
We present ammonia observations of 193 dense cores and core candidates in the Perseus molecular cloud made using the Robert F. Byrd Green Bank Telescope. We simultaneously observed…
A multispectral view of the periodic events in eta Carinae
A. Damineli, D. J. Hillier, M. F. Corcoran +13
A full description of the 5.5-yr low excitation events in Eta Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two co…
FUV Spectroscopy of the sdOB Primary of the Eclipsing Binary System AA Dor
Johannes Fleig, Thomas Rauch, Klaus Werner +1
AA Dor is an eclipsing, close, post common-envelope binary (PCEB). We present a detailed spectral analysis of its sdOB primary star based on observations obtained with the Far Ultr…
HAT-P-6b: A Hot Jupiter transiting a bright F star
R. W. Noyes, G. A. Bakos, G. Torres +17
In the ongoing HATNet survey we have detected a giant planet, with radius 1.33 +/- 0.06 RJup and mass 1.06 +/- 0.12 MJup, transiting the bright (V = 10.5) star GSC 03239-00992. The…
High redshift FRII radio sources: large-scale X-ray environment
Elena Belsole, Diana M. Worrall, Martin J. Hardcastle +1
We investigate the properties of the environment around 20 powerful radio galaxies and quasars at redshifts between 0.45 and 1. Using XMM-Newton and Chandra observations we probe t…
Quasar optical variability and black hole mass
M. Wold, M. S. Brotherton, Z. Shang
In order to investigate the dependence of quasar optical-UV variability on fundamental physical parameters like black hole mass, we have matched quasars from the QUEST1 variability…
A Morphological and Statistical Analysis of Ansae in Barred Galaxies
I. Martinez-Valpuesta, J. H. Knapen, R. Buta
Many barred galaxies show a set of symmetric enhancements at the ends of the stellar bar, called {\it ansae}, or the ``handles'' of the bar. The ansa bars have been in the literatu…
The potential for Earth-mass planet formation around brown dwarfs
Matthew J. Payne, Giuseppe Lodato
Recent observations point to the presence of structured dust grains in the discs surrounding young brown dwarfs, thus implying that the first stages of planet formation take place…
Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
A. J. Korn, F. Grundahl, O. Richard +5
We present a homogeneous photometric and spectroscopic analysis of 18 stars along the evolutionary sequence of the metal-poor globular cluster NGC 6397 ([Fe/H] = -2), from the main…
Evidence for a J/psi-ppbar Pauli Strong Coupling ?
T. Barnes, X. Li, W. Roberts
The couplings of charmonia and charmonium hybrids (generically Psi) to ppbar are of great interest in view of future plans to study these states using an antiproton storage ring at…
Spectral Analysis of Central Stars of Planetary Nebulae
Thomas Rauch, Klaus Werner, Marc Ziegler +2
Spectral analysis by means of NLTE model atmospheres has presently arrived at a high level of sophistication. High-resolution spectra of central stars of planetary nebulae can be r…
Two-Dimensional Spectroscopy of Photospheric Shear Flows in a Small delta Spot
C. Denker, N. Deng, A. Tritschler +1
In recent high-resolution observations of complex active regions, long-lasting and well-defined regions of strong flows were identified in major flares and associated with bright k…
Warp diffusion in accretion discs: a numerical investigation
Giuseppe Lodato, J. E. Pringle
In this paper we explore numerically the evolution of a warped accretion disc. Here, we focus here on the regime where the warp evolves diffusively. By comparing the numerical resu…
Probing e-e interactions in a periodic array of GaAs quantum wires
Y. Jompol, C. J. B. Ford, I. Farrer +5
We present the results of non-linear tunnelling spectroscopy between an array of independent quantum wires and an adjacent two-dimensional electron gas (2DEG) in a double-quantum-w…
The dwarf low surface brightness population in different environments of the Local Universe
S. Sabatini, J. I. Davies, S. Roberts +1
The nature of the dwarf galaxy population as a function of location in the cluster and within different environments is investigated. We have previously described the results of a…
Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b
M. Gillon, B. -O. Demory, T. Barman +6
We present Spitzer Space Telescope infrared photometry of a primary transit of the hot Neptune GJ 436b. The observations were obtained using the 8 microns band of the InfraRed Arra…
Electron fishbones: Theory and experimental evidence
F. Zonca, P. Buratti, A. Cardinali +13
We discuss the processes underlying the excitation of fishbone-like internal kink instabilities driven by supra-thermal electrons generated experimentally by different means: Elect…
Searching for tidal tails - investigating galaxy harassment
J. I. Davies, S. Roberts, S. Sabatini
Galaxy harassment has been proposed as a physical process that morphologically transforms low surface density disc galaxies into dwarf elliptical galaxies in clusters. It has been…
Characterization of the hot Neptune GJ 436b with Spitzer and ground-based observations
B. -O. Demory, M. Gillon, T. Barman +11
We present Spitzer Space Telescope infrared photometry of a secondary eclipse of the hot Neptune GJ436b. The observations were obtained using the 8-micron band of the InfraRed Arra…
High-resolution FUSE and HST ultraviolet spectroscopy of the white dwarf central star of Sh 2-216
T. Rauch, M. Ziegler, K. Werner +5
LS V +4621 is the DAO-type central star of the planetary nebula Sh 2-216. We perform a comprehensive spectral analysis of high-resolution, high-S/N ultraviolet observations obtaine…