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Astrophysical parameters of Galactic open clusters
Scholz, R. -D.; Piskunov, A. E.; Kharchenko, N. V. +2 more
We present a catalogue of astrophysical data for 520 Galactic open clusters. These are the clusters for which at least three most probable members (18 on average) could be identified in the ASCC-2.5, a catalogue of stars based on the Tycho-2 observations from the Hipparcos mission. We applied homogeneous methods and algorithms to determine angular…
In situ measurements of the physical characteristics of Titan's environment
Neubauer, F. M.; Rodrigo, R.; Barucci, M. A. +40 more
On the basis of previous ground-based and fly-by information, we knew that Titan's atmosphere was mainly nitrogen, with some methane, but its temperature and pressure profiles were poorly constrained because of uncertainties in the detailed composition. The extent of atmospheric electricity (`lightning') was also hitherto unknown. Here we report t…
Wave acceleration of electrons in the Van Allen radiation belts
Meredith, Nigel P.; Horne, Richard B.; Glauert, Sarah A. +11 more
The Van Allen radiation belts are two regions encircling the Earth in which energetic charged particles are trapped inside the Earth's magnetic field. Their properties vary according to solar activity and they represent a hazard to satellites and humans in space. An important challenge has been to explain how the charged particles within these bel…
Spitzer View on the Evolution of Star-forming Galaxies from z = 0 to z ~ 3
Papovich, Casey; Pérez-González, Pablo G.; Rieke, George H. +11 more
We use a 24 µm-selected sample containing more than 8000 sources to study the evolution of star-forming galaxies in the redshift range from z=0 to z~3. We obtain photometric redshifts for most of the sources in our survey using a method based on empirically built templates spanning from ultraviolet to mid-infrared wavelengths. The accuracy o…
The Effective Temperature Scale of FGK Stars. II. Teff:Color:[Fe/H] Calibrations
Meléndez, Jorge; Ramírez, Iván
We present up-to-date metallicity-dependent temperature versus color calibrations for main-sequence and giant stars based on temperatures derived with the infrared flux method (IRFM). Seventeen colors in the photometric systems UBV, uvby, Vilnius, Geneva, RI(Cousins), DDO, Hipparcos-Tycho, and Two Micron All Sky Survey (2MASS) have been calibrated…
Optimization of Starburst99 for Intermediate-Age and Old Stellar Populations
Leitherer, Claus; Vázquez, Gerardo A.
We have incorporated the latest release of the Padova models into the evolutionary synthesis code Starburst99. The Padova tracks were extended to include the full asymptotic giant branch (AGB) evolution until the final thermal pulse over the mass range 0.9-5 Msolar. With this addition, Starburst99 accounts for all stellar phases that co…
The afterglow of GRB 050709 and the nature of the short-hard γ-ray bursts
Cenko, S. B.; Peterson, B. A.; Price, P. A. +33 more
The final chapter in the long-standing mystery of the γ-ray bursts (GRBs) centres on the origin of the short-hard class of bursts, which are suspected on theoretical grounds to result from the coalescence of neutron-star or black-hole binary systems. Numerous searches for the afterglows of short-hard bursts have been made, galvanized by the revolu…
Measurement of the Electric Fluctuation Spectrum of Magnetohydrodynamic Turbulence
Bale, S. D.; Horbury, T. S.; Reme, H. +2 more
Magnetohydrodynamic (MHD) turbulence in the solar wind is observed to show the spectral behavior of classical Kolmogorov fluid turbulence over an inertial subrange and departures from this at short wavelengths, where energy should be dissipated. Here we present the first measurements of the electric field fluctuation spectrum over the inertial and…
The Solar Wind as a Turbulence Laboratory
Bruno, Roberto; Carbone, Vincenzo
In this review we will focus on a topic of fundamental importance for both plasma physics and astrophysics, namely the occurrence of large-amplitude low-frequency fluctuations of the fields that describe the plasma state. This subject will be treated within the context of the expanding solar wind and the most meaningful advances in this research f…
Toward an Understanding of the Rapid Decline of the Cosmic Star Formation Rate
Papovich, Casey; Pérez-González, Pablo G.; Bell, Eric F. +11 more
We present a first analysis of deep 24 µm observations with the Spitzer Space Telescope of a sample of nearly 1500 galaxies in a thin redshift slice, 0.65<=z<0.75. We combine the infrared data with redshifts, rest-frame luminosities, and colors from COMBO-17 and with morphologies from Hubble Space Telescope images collected by the Gala…