Science Archives Publication System

X-ray spectroscopy of the W UMa-type binary 44 Bootis

DOI: 10.1051/0004-6361:20040494 Bibcode: 2004A&A...426.1035G

Gondoin, P.

44 Boo B, a W UMa-type binary system, was observed in June 2001 during one entire revolution period with the XMM-Newton observatory. The count rate in the 0.3 to 2 keV band is constant in average with 5 to 20% count rate increases reminiscent of flares. Spectral fitting of the EPIC spectra indicates a corona configuration with little contribution …

2004 • Astronomy and Astrophysics

XMM-Newton 16

XMM-Newton observations of the two X-ray weak quasars PG 1411+442 and Mrk 304

DOI: 10.1051/0004-6361:20031617 Bibcode: 2004A&A...414..107B

Papadakis, I. E.; Brinkmann, W.; Ferrero, E.

We present the results of XMM-Newton observations of two X-ray weak quasars, PG 1411+442 and Mrk 304. In both cases the spectra can basically be represented by hard power laws with photon indices typical for radio-quiet quasars, heavily intrinsically absorbed by column densities of ∼2×10²³ cm^-2 in PG 1411+442 and ∼4×10^22…

2004 • Astronomy and Astrophysics

XMM-Newton 16

Statistical comparison of transition region blinkers and explosive events

DOI: 10.1051/0004-6361:20040479 Bibcode: 2004A&A...422..709B

Peter, H.; Brković, A.

Explosive events and blinkers are two observational classes of transients seen on the quiet Sun and an investigation of the significance of and relationship between such events may be critical for understanding basic processes at work in the solar atmosphere. We analysed five time-series spectra of the quiet Sun of transition region O XV 629 Å, O …

2004 • Astronomy and Astrophysics

SOHO 16

Accommodating electric propulsion on SMART-1

DOI: 10.1016/j.actaastro.2004.04.003 Bibcode: 2004AcAau..55..121K

Rathsman, Peter; Kugelberg, Joakim; Bodin, Per +1 more

This paper focuses on the technical challenges that arise when electric propulsion is used on a small spacecraft such as SMART-1. The choice of electric propulsion influences not only the attitude control system and the power system, but also the thermal control as well as the spacecraft structure. A description is given on how the design of the a…

2004 • Acta Astronautica

SMART-1 16

XMM-Newton observations of the giant H II region N 11 in the LMC

DOI: 10.1051/0004-6361:20035633 Bibcode: 2004A&A...418..841N

Gosset, E.; Nazé, Y.; Chu, Y. -H. +3 more

Using the sensitive XMM-Newton observatory, we have observed the giant H II region N 11 in the LMC for ∼30 ks. We have detected several large areas of soft diffuse X-ray emission along with 37 point sources. One of the most interesting results is the possible association of a faint X-ray source with BSDL 188, a small extended object of uncertain n…

2004 • Astronomy and Astrophysics

XMM-Newton 16

Constraining the X-Ray Luminosities of Asymptotic Giant Branch Stars: TX Camelopardalis and T Cassiopeia

DOI: 10.1086/420877 Bibcode: 2004ApJ...608..978K

Soker, Noam; Kastner, Joel H.

To probe the magnetic activity levels of asymptotic giant branch (AGB) stars, we used XMM-Newton to search for X-ray emission from two well-studied objects, TX Cam and T Cas. The former star displays polarized maser emission, indicating magnetic field strengths of B~5 G, and the latter is one of the nearest known AGB stars. Neither star was detect…

2004 • The Astrophysical Journal

XMM-Newton 16

Observations of lower hybrid cavities in the inner magnetosphere by the Cluster and Viking satellites

DOI: 10.5194/angeo-22-2961-2004 Bibcode: 2004AnGeo..22.2961T

André, M.; Maksimovic, M.; Eriksson, A. +1 more

Available from http://www.copernicus.org/site/EGU/annales/22/8/2961.htm?FrameEngine=false;

2004 • Annales Geophysicae

Cluster 16

Relating magnetic field strengths to hard X-ray emission in solar flares

DOI: 10.1051/0004-6361:20040392 Bibcode: 2004A&A...423..363G

van Driel-Gesztelyi, L.; Harra, L. K.; Matthews, S. A. +1 more

The observation of hard X-ray (HXR) emission in solar flares provides important diagnostic information about the acceleration and subsequent transport of energetic electrons in the flare process. However, while hard X-rays are thought to be emitted from the flare footpoints through thick-target bremsstrahlung interactions, the details of the trans…

2004 • Astronomy and Astrophysics

SOHO 16

An Extreme, Blueshifted Iron-Line Profile in the Narrow-Line Seyfert 1 PG 1402+261: An Edge-on Accretion Disk or Highly Ionized Absorption?

DOI: 10.1086/424478 Bibcode: 2004ApJ...615..150R

Turner, T. J.; Porquet, D.; Reeves, J. N.

We report on a short XMM-Newton observation of the radio-quiet narrow-line Seyfert 1 galaxy PG 1402+261. The EPIC X-ray spectrum of PG 1402+261 shows a strong excess of counts between 6 and 9 keV in the rest frame. This feature can be modeled by an unusually strong (equivalent width 2 keV) and very broad (FWHM velocity of 110,000 km s^-1…

2004 • The Astrophysical Journal

XMM-Newton 16

The Beagle 2 environmental sensors: science goals and instrument description

DOI: 10.1016/j.pss.2004.07.015 Bibcode: 2004P&SS...52.1141T

Patel, M. R.; Zarnecki, J. C.; Wilson, C. F. +12 more

A suite of instruments on the Beagle 2 Mars lander was designed and built in order to investigate the environmental conditions at the landing site. The sensor suite was capable of measuring air temperature at two heights, surface level pressure, wind speed and direction, saltated particle momentum, UV flux (diffuse and direct at five wavelengths),…

2004 • Planetary and Space Science

MEx 16