Science Archives Publication System

Central Proper-Motion Kinematics of NGC 6752

DOI: 10.1086/374789 Bibcode: 2003AJ....125.2559D

Bailyn, C. D.; Drukier, G. A.; Van Altena, W. F. +1 more

We present proper motions derived from Wide Field Planetary Camera 2 (WFPC2) imaging for stars in the core of the peculiar globular cluster NGC 6752. The central velocity dispersion in both components of the proper motion is 12 km s^-1. We discuss the implications of this result, as well as the intrinsic difficulties in making such measu…

2003 • The Astronomical Journal

eHST 22

Astrometric Positions and Proper Motions of 19 Radio Stars

DOI: 10.1086/375462 Bibcode: 2003AJ....126..484B

Zacharias, N.; Claussen, M. J.; de Vegt, C. +4 more

We have used the Very Large Array, linked with the Pie Town Very Long Baseline Array antenna, to determine the astrometric positions of 19 radio stars in the International Celestial Reference Frame (ICRF). The positions of these stars were directly linked to the positions of distant quasars through phase-referencing observations. The positions of …

2003 • The Astronomical Journal

Hipparcos 22

Helium Abundance in the Corona and Solar Wind: Gyrotropic Modeling from the Chromosphere to 1 AU

DOI: 10.1086/377640 Bibcode: 2003ApJ...596..621L

Hansteen, Viggo H.; Lie-Svendsen, Øystein; Leer, Egil

We have developed a solar wind model including helium that extends from the chromosphere to 1 AU. The model is based on the gyrotropic approximation to the 16-moment set of fluid transport equations, which allows it to accommodate temperature anisotropies, as well as nonclassical heat transport. We find that, as in a pure electron-proton solar win…

2003 • The Astrophysical Journal

SOHO 22

Crystalline water ice in OH32.8-0.3

DOI: 10.1046/j.1365-8711.2003.07013.x Bibcode: 2003MNRAS.345..912M

Maldoni, M. M.; Robinson, G.; Wright, C. M. +2 more

The 2.2-200 µm spectrum of OH32.8-0.3 has been modelled. Mie theory and radiative transfer models of the 3-µm band of H₂O ice are consistent with a strongly crystalline structural phase. This is also confirmed by the presence of a 44/62-µm band complex analogous to that of laboratory crystalline H₂O ice anal…

2003 • Monthly Notices of the Royal Astronomical Society

ISO 22

CTQ 327: A New Gravitational Lens

DOI: 10.1086/376470 Bibcode: 2003AJ....126..696M

Becker, R.; Wisotzki, L.; Gregg, M. D. +4 more

We present the second gravitationally lensed quasar discovered during the course of a Hubble Space Telescope Space Telescope Imaging Spectrograph snapshot survey for small-separation gravitational lenses. CTQ 327 is a double quasar with an image separation of 1.22" and a g-band flux ratio of roughly 5 to 1. Spectra reveal both components to be z=1…

2003 • The Astronomical Journal

eHST 22

On the solar origin of interplanetary disturbances observed in the vicinity of the Earth

DOI: 10.5194/angeo-21-847-2003 Bibcode: 2003AnGeo..21..847V

Schwenn, R.; Pick, M.; Vilmer, N. +2 more

The solar origin of 40 interplanetary disturbances observed in the vicinity of the Earth between January 1997 and June 1998 is investigated in this paper. Analysis starts with the establishment of a list of Interplanetary Mass Ejections or ICMEs (magnetic clouds, flux ropes and ejecta) and of Interplanetary Shocks measured at WIND for the period f…

2003 • Annales Geophysicae

SOHO 22

Transneptunian Binaries

DOI: 10.1023/B:MOON.0000031954.78421.34 Bibcode: 2003EM&P...92..395N

Noll, Keith S.

The discovery of binaries among the population of transneptunian objects isa landmark advance in the study of this remote region of the solar system.Determination of binary orbits will enable direct determination of systemmasses, fundamental for determination of density, internal structure, and bulkcomposition. The mere existence of binaries with …

2003 • Earth Moon and Planets

eHST 22

The Star Formation Histories of Four Fields Spanning the Minor Axis of NGC 6822

DOI: 10.1086/375208 Bibcode: 2003AJ....125.3097W

Wyder, Ted K.

The star formation histories of four fields within the Local Group dwarf irregular galaxy NGC 6822 are presented. Each of the fields was imaged by the WFPC2 aboard the Hubble Space Telescope and were used to obtain VI color-magnitude diagrams for each field reaching V~=26. The magnitude of the tip of the red giant branch and the red clump were use…

2003 • The Astronomical Journal

eHST 22

A far-infrared view of the Lockman Hole from ISO 95-µm observations - I. A new data reduction method

DOI: 10.1046/j.1365-8711.2003.06730.x Bibcode: 2003MNRAS.343.1155R

Rodighiero, G.; Franceschini, A.; Lari, C. +2 more

We report results from a new analysis of a deep 95-µm imaging survey with the photopolarimeter ISOPHOT on-board the Infrared Space Observatory, over a 40 × 40 arcmin² area within the Lockman Hole. To this end we exploit a newly developed parametric algorithm able to identify and clean spurious signals induced by cosmic rays impact…

2003 • Monthly Notices of the Royal Astronomical Society

ISO 22

Flare-Induced Excitation of Solar p modes

DOI: 10.1023/B:SOLA.0000013043.45512.20 Bibcode: 2003SoPh..218..151A

Basu, Sarbani; Antia, H. M.; Ambastha, Ashok

Solar flares release large amounts of energy at different layers of the solar atmosphere, including at the photosphere in the case of exceptionally major events. Therefore, it is expected that large flares would be able to excite acoustic waves on the solar surface, thereby affecting the p-mode oscillation characteristics. We have applied the ring…

2003 • Solar Physics

SOHO 22