Science Archives Publication System

Spectral Irradiance Calibration in the Infrared. XIII. ``Supertemplates'' and On-Orbit Calibrators for the SIRTF Infrared Array Camera

DOI: 10.1086/374362 Bibcode: 2003AJ....125.2645C

Megeath, S. T.; Stauffer, John; Cohen, Martin +2 more

We describe the technique that will be used to develop a set of on-orbit calibrators for the Infrared Array Camera (IRAC) and demonstrate the validity of the method for stars with spectral types either K0-M0 III or A0-A5 V. For application to SIRTF, the approach is intended to operate with all available optical, near-infrared (NIR), and mid-infrar…

2003 • The Astronomical Journal

Hipparcos 174

Acceleration of the solar wind as a result of the reconnection of open magnetic flux with coronal loops

DOI: 10.1029/2002JA009284 Bibcode: 2003JGRA..108.1157F

Fisk, L. A.

There are compelling observations of a clear anticorrelation between solar wind flow speed and coronal electron temperature, as determined from solar wind ionic charge states. A simple theory is presented which can account for these observations, including the functional form of the correlation: Solar wind flow speed squared varies essentially lin…

2003 • Journal of Geophysical Research (Space Physics)

SOHO Ulysses 173

Locating the Launching Region of T Tauri Winds: The Case of DG Tauri

DOI: 10.1086/376824 Bibcode: 2003ApJ...590L.107A

Li, Zhi-Yun; Blandford, Roger D.; Krasnopolsky, Ruben +1 more

It is widely believed that T Tauri winds are driven magnetocentrifugally from accretion disks close to the central stars. The exact launching conditions are uncertain. We show that a general relation exists between the poloidal and toroidal velocity components of a magnetocentrifugal wind at large distances and the rotation rate of the launching s…

2003 • The Astrophysical Journal

eHST 173

First results obtained by the Cluster STAFF experiment

DOI: 10.5194/angeo-21-437-2003 Bibcode: 2003AnGeo..21..437C

Maksimovic, M.; Chust, T.; de Conchy, Y. +20 more

The Spatio Temporal Analysis of Field Fluctuations (STAFF) experiment is one of the five experiments, which constitute the Cluster Wave Experiment Consortium (WEC). STAFF consists of a three-axis search coil magnetometer to measure magnetic fluctuations at frequencies up to 4 kHz, a waveform unit (up to either 10 Hz or 180 Hz) and a Spectrum Analy…

2003 • Annales Geophysicae

Cluster 172

Galactic Bulges from Hubble Space Telescope Near-Infrared Camera Multi-Object Spectrometer Observations: The Lack of r^1/4 Bulges

DOI: 10.1086/367783 Bibcode: 2003ApJ...582L..79B

Balcells, Marc; Graham, Alister W.; Domínguez-Palmero, Lilian +1 more

We use Hubble Space Telescope (HST) near-infrared imaging to explore the shapes of the surface brightness profiles of bulges of S0-Sbc galaxies at high resolution. Modeling extends to the outer bulge via bulge-disk decompositions of combined HST-ground-based profiles. Compact, central unresolved components similar to those reported by others are f…

2003 • The Astrophysical Journal

eHST 172

Composition and origin of the atmosphere of Jupiter - an update, and implications for the extrasolar giant planets

DOI: 10.1016/S0032-0633(02)00144-7 Bibcode: 2003P&SS...51..105A

Wong, M. H.; Atreya, S. K.; Owen, T. C. +2 more

New developments have led to this update of the composition and origin of Jupiter's atmosphere that were originally discussed in our Planet. Space Sci. 47 (1999) 1243 paper. Since Jupiter can provide important insight into the atmospheres of extrasolar giant planets (EGP), we also discuss here the possible implications of the first detection of an…

2003 • Planetary and Space Science

ISO 172

Alfvénic Turbulence in the Extended Solar Corona: Kinetic Effects and Proton Heating

DOI: 10.1086/376777 Bibcode: 2003ApJ...594..573C

Cranmer, S. R.; van Ballegooijen, A. A.

We present a model of magnetohydrodynamic (MHD) turbulence in the extended solar corona that contains the effects of collisionless dissipation and anisotropic particle heating. Recent observations have shown that preferential heating and acceleration of positive ions occur in the first few solar radii of the high-speed solar wind. Measurements mad…

2003 • The Astrophysical Journal

SOHO 171

The Tycho-2 Spectral Type Catalog

DOI: 10.1086/345511 Bibcode: 2003AJ....125..359W

Egan, Michael P.; Kraemer, Kathleen E.; Price, Stephan D. +1 more

The Tycho-2 Catalogue contains positions, proper motions, and B_T and V_T magnitudes for approximately 2.5 million stars. We have obtained spectral types for 351,864 of the Tycho-2 stars by cross-referencing Tycho-2 to several catalogs containing spectral types, using the VizieR astronomical database. The positional matching re…

2003 • The Astronomical Journal

Hipparcos 171

Formation of polar ring galaxies

DOI: 10.1051/0004-6361:20030150 Bibcode: 2003A&A...401..817B

Bournaud, F.; Combes, F.

Polar ring galaxies are peculiar systems in which a gas-rich, nearly polar ring surrounds an early-type or elliptical host galaxy. Two formation scenarios for these objects have been proposed: they are thought to form either in major galaxy mergers or by tidal accretion of the polar material from a gas rich donor galaxy. Both scenarios are studied…

2003 • Astronomy and Astrophysics

eHST 170

Formation and development of shock waves in the solar corona and the near-Sun interplanetary space

DOI: 10.1051/0004-6361:20021593 Bibcode: 2003A&A...400..329M

Mann, G.; Classen, H. -T.; Aurass, H. +1 more

At the Sun, shock waves are produced either by flares and/or by coronal mass ejections (CMEs) and are regarded as the source of solar energetic particle events. They can be able to generate solar type II radio bursts. The non-radial propagation of a disturbance is considered away from an active region through the corona into the interplanetary spa…

2003 • Astronomy and Astrophysics

SOHO 170