Science Archives Publication System

New Mass-Loss Measurements from Astrospheric Lyα Absorption

DOI: 10.1086/432716 Bibcode: 2005ApJ...628L.143W

Linsky, J. L.; Redfield, S.; Zank, G. P. +2 more

Measurements of stellar mass-loss rates are used to assess how wind strength varies with coronal activity and age for solar-like stars. Mass loss generally increases with activity, but we find evidence that winds suddenly weaken at a certain activity threshold. Very active stars are often observed to have polar starspots, and we speculate that the…

2005 • The Astrophysical Journal

eHST 393

Star Formation in NGC 5194 (M51a): The Panchromatic View from GALEX to Spitzer

DOI: 10.1086/466518 Bibcode: 2005ApJ...633..871C

Helou, G.; Roussel, H.; Leitherer, C. +32 more

Far-ultraviolet to far-infrared images of the nearby galaxy NGC 5194 (M51a), from a combination of space-based (Spitzer, GALEX, and Hubble Space Telescope) and ground-based data, are used to investigate local and global star formation and the impact of dust extinction. The Spitzer data provide unprecedented spatial detail in the infrared, down to …

2005 • The Astrophysical Journal

eHST 392

A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)

DOI: 10.1086/427854 Bibcode: 2005AJ....129.1483L

Lépine, Sébastien; Shara, Michael M.

The LSPM catalog is a comprehensive list of 61,977 stars north of the J2000 celestial equator that have proper motions larger than 0.15" yr^-1 (local-background-stars frame). The catalog has been generated primarily as a result of our systematic search for high proper motion stars in the Digitized Sky Surveys using our SUPERBLINK softwar…

2005 • The Astronomical Journal

Hipparcos 382

Discovery of the binary pulsar PSR B1259-63 in very-high-energy gamma rays around periastron with HESS

DOI: 10.1051/0004-6361:20052983 Bibcode: 2005A&A...442....1A

Raux, J.; Ripken, J.; Funk, S. +99 more

We report the discovery of very-high-energy (VHE) γ-ray emission of the binary system PSR B1259-63/SS 2883 of a radio pulsar orbiting a massive, luminous Be star in a highly eccentric orbit. The observations around the 2004 periastron passage of the pulsar were performed with the four 13 m Cherenkov telescopes…

2005 • Astronomy and Astrophysics

INTEGRAL 375

Shock Geometry, Seed Populations, and the Origin of Variable Elemental Composition at High Energies in Large Gradual Solar Particle Events

DOI: 10.1086/429384 Bibcode: 2005ApJ...625..474T

Cohen, C. M. S.; Mewaldt, R. A.; Maclennan, C. G. +5 more

Above a few tens of MeV per nucleon, large, gradual solar energetic particle (SEP) events are highly variable in their spectral characteristics and elemental composition. The origin of this variability has been a matter of intense and ongoing debate. In this paper, we propose that this variability arises from the interplay of two factors-shock geo…

2005 • The Astrophysical Journal

SOHO Ulysses 370

The Morphology-Density Relation in z ~ 1 Clusters

DOI: 10.1086/428881 Bibcode: 2005ApJ...623..721P

Ford, H. C.; Demarco, R.; Infante, L. +39 more

We measure the morphology-density relation (MDR) and morphology-radius relation (MRR) for galaxies in seven z~1 clusters that have been observed with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope. Simulations and independent comparisons of our visually derived morphologies indicate that ACS allows one to distinguish bet…

2005 • The Astrophysical Journal

eHST 365

The structural and scaling properties of nearby galaxy clusters. II. The M-T relation

DOI: 10.1051/0004-6361:20052856 Bibcode: 2005A&A...441..893A

Arnaud, M.; Pointecouteau, E.; Pratt, G. W.

Using a sample of ten nearby (z≲ 0.15), relaxed galaxy clusters in the temperature range [2-9]~keV, we have investigated the scaling relation between the mass at various density contrasts (δ=2500,1000,500,200) and the cluster temperature. The masses are derived from NFW-type model fits to mass profiles, obtained under the hydrostatic assumption us…

2005 • Astronomy and Astrophysics

XMM-Newton 362

Olivine and Pyroxene Diversity in the Crust of Mars

DOI: 10.1126/science.1109098 Bibcode: 2005Sci...307.1594M

Mangold, N.; Bibring, J. -P.; Gendrin, A. +6 more

Data from the Observatoire pour la Minéralogie, l'Eau, les Glaces, et l'Activité (OMEGA) on the Mars Express spacecraft identify the distinct mafic, rock-forming minerals olivine, low-calcium pyroxene (LCP), and high-calcium pyroxene (HCP) on the surface of Mars. Olivine- and HCP-rich regions are found in deposits that span the age range of geolog…

2005 • Science

MEx 358

Ion Neutral Mass Spectrometer Results from the First Flyby of Titan

DOI: 10.1126/science.1110652 Bibcode: 2005Sci...308..982W

Ip, Wing-Huen; McNutt, Ralph L.; Waite, J. Hunter +19 more

The Cassini Ion Neutral Mass Spectrometer (INMS) has obtained the first in situ composition measurements of the neutral densities of molecular nitrogen, methane, molecular hydrogen, argon, and a host of stable carbon-nitrile compounds in Titan's upper atmosphere. INMS in situ mass spectrometry has also provided evidence for atmospheric waves in th…

2005 • Science

Cassini 357

A planetary system as the origin of structure in Fomalhaut's dust belt

DOI: 10.1038/nature03601 Bibcode: 2005Natur.435.1067K

Kalas, Paul; Graham, James R.; Clampin, Mark

The Sun and >15per cent of nearby stars are surrounded by dusty disks that must be collisionally replenished by asteroids and comets, as the dust would otherwise be depleted on timescales <10⁷years (ref. 1). Theoretical studies show that the structure of a dusty disk can be modified by the gravitational influence of planets, but t…

2005 • Nature

eHST 345