Science Archives Publication System

Variable Star Candidates in an Advanced Camera for Surveys Field of M31

DOI: 10.1086/429735 Bibcode: 2005AJ....129.2663W

Williams, Benjamin F.

A search for variable stars is performed using two epochs of Hubble Space Telescope Advanced Camera for Surveys imaging data for a 9.28 arcmin² portion of M31. This data set reveals 254 sources that vary by at least 4 σ between epochs. The positions and two-epoch B-band (equivalent) photometry of these sources are presented. The photome…

2005 • The Astronomical Journal

eHST 2

The COSMOS 2-degree HST/ACS survey [review article]

DOI: 10.1016/j.newar.2005.08.023 Bibcode: 2005NewAR..49..461K

Koekemoer, Anton M.; Scoville, Nick Z.

The COSMOS survey is the largest contiguous imaging project ever undertaken with the Hubble Space Telescope, using ACS/WFC to image a 2 square degree low-background equatorial field in 600 orbits with the F814W ( I) filter. The survey is providing over 2 million objects with a 10σ detection limit AB( I) < 27, with a sky coverage of 10 billion A…

2005 • New Astronomy Reviews

eHST 2

The HeI abundance in Solar filaments

DOI: 10.1051/0004-6361:20053341 Bibcode: 2005A&A...443.1055C

Chiuderi Drago, F.

Three filaments observed with the CDS instrument on the SOHO satellite are analysed to determine the HeI/HI ratio. The HI and Hel bound-free absorptions are the major processes responsible for the lower intensity of transition region (TR) lines observed above filaments. One of the filaments was also observed by SUMER at λ > 912 Å, thus supplyin…

2005 • Astronomy and Astrophysics

SOHO 2

The electric potential at the Earth's quasi-parallel bow shock: Initial Cluster results

DOI: 10.1063/1.2032678 Bibcode: 2005AIPC..781...79B

André, M.; Bale, S. D.; Lucek, E. A. +2 more

We present multi-spacecraft measurements of a quasi-parallel shock crossing obtained by the Cluster satellites. Observations commonly show the presence of Short Large-Amplitude Magnetic Structures (SLAMS) at the Earth's quasi-parallel bow shock. These structures are thought to play an important role for decelerating, heating and deflecting the inc…

2005 • The Physics of Collisionless Shocks: 4th Annual IGPP International Astrophysics Conference

Cluster 2

What is Cluster telling us about magnetotail dynamics?

DOI: 10.1016/j.asr.2004.02.021 Bibcode: 2005AdSpR..36.1909B

Nakamura, Rumi; Baumjohann, Wolfgang

In this review, we report on some new aspects of magnetotail dynamics found in the data of the first traversal of the magnetotail by the Cluster quartet in summer and autumn 2001: (1) The electron drift instrument made the first direct measurements of tail lobe convection. The statistical data shows convection toward the center of the plasma sheet…

2005 • Advances in Space Research

Cluster 2

A search for temporal variability in the surface chemistry of the icy Galilean satellites

DOI: 10.1016/j.icarus.2004.10.005 Bibcode: 2005Icar..173...50D

Hendrix, Amanda; Domingue, Deborah

The purpose of this study was to determine if any temporal variability in the broadband UV spectral properties of the icy Galilean satellites exists, and if so, to characterize its spatial distribution as a function of longitude in order to attempt to correlate any temporal changes with satellite surface interactions with the space environment. Th…

2005 • Icarus

IUE 2

A Flare and Umbral Flashes in a Sunspot

DOI: 10.1007/s11207-005-1715-0 Bibcode: 2005SoPh..227...75T

Turova, I. P.; Ozhogina, O. A.; Yurysheva, O. V.

We studied the evolution and dynamic processes in the chromosphere above a sunspot umbra. A relatively rarely occurring phenomenon of bright long-lasting emission observed in the umbra of a unipolar sunspot of the AR 9570 group on August 11, 2001 was investigated. It was found that during the course of the observation, emission was spreading, grad…

2005 • Solar Physics

SOHO 1

Planetary science: The impact of Deep Impact

DOI: 10.1038/437958a Bibcode: 2005Natur.437..958F

Feldman, Paul D.

A good look at the Deep Impact cometary encounter was taken by the Rosetta mission, itself on the way to a rendezvous with a comet in 2014. So what is a comet - icy dustball or dusty iceball?

2005 • Nature

Rosetta 1

Energetic particle acceleration during a major magnetic storm

DOI: 10.1016/j.asr.2004.03.023 Bibcode: 2005AdSpR..36.1835K

Grande, M.; Baker, D.; Blake, J. B. +6 more

We study the global properties of energetic (>30 keV) particles during the main and early recovery phase of a major magnetic storm of March 31, 2001, using data of the NOAA 15 and 16 and the CLUSTER satellites. During the storm main phase the ring current energetic electron and ion fluxes were increased by nearly two orders of magnitude, and th…

2005 • Advances in Space Research

Cluster 1

Annihilation of positrons in the Galaxy

DOI: 10.1007/s10686-006-9039-0 Bibcode: 2005ExA....20...15S

Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +1 more

Observations of electron-positron annihilation radiation from the Galactic Center region with the SPI instrument aboard INTEGRAL are summarized. The measured width of the 511 keV line and inferred fraction of positrons annihilating through positronium formation are consistent with the annihilation taking place in the warm ISM phase, although combi…

2005 • Experimental Astronomy

INTEGRAL 1