Science Archives Publication System

Inverse radiation modeling of Titan's atmosphere to assimilate solar aureole imager data of the Huygens probe

DOI: 10.1016/S0032-0633(02)00142-3 Bibcode: 2003P&SS...51..147G

Keller, H. U.; Grieger, B.; Markiewicz, W. J. +1 more

During the descent of the Huygens probe through Titan's atmosphere in January 2005, the Descent Imager/Spectral Radiometer (DISR) will perform upward and downward looking measurements at various spectral ranges and spatial resolutions. This internal radiation density could be estimated by radiative transfer calculations for Titan's atmosphere. How…

2003 • Planetary and Space Science

Huygens 5

XMM-Newton local bubble and galactic halo survey

DOI: 10.1002/asna.200310061 Bibcode: 2003AN....324..162F

Freyberg, M. J.; Breitschwerdt, D.

2003 • Astronomische Nachrichten

XMM-Newton 5

Optical identifications in the Marano field XMM-Newton survey

DOI: 10.1002/asna.200310005 Bibcode: 2003AN....324...16L

Hasinger, G.; Mignoli, M.; Zamorani, G. +4 more

The ``Marano field'', a deep optical quasar survey field, has been observed by the XMM Newton EPIC camera with 16 overlapping pointings totalling at ~ 120 ksec integration time. Source detection in the merged observations resulted in more than 600 X-ray sources. Here we present the status of optical follow up observations which were undertaken to …

2003 • Astronomische Nachrichten

XMM-Newton 5

HST observation of the atmospheric composition of Jupiter's equatorial region: evidence for tropospheric C ₂H ₂

DOI: 10.1016/S0019-1035(03)00086-1 Bibcode: 2003Icar..163..414B

Griffith, Caitlin A.; Yelle, Roger V.; Bétrémieux, Yan

This paper presents the first detailed analysis of acetylene absorption features observed longward of 190.0 nm in a jovian spectrum by the Faint Object Spectrograph on board the Hubble Space Telescope. The presence of two features located near 207.0 nm can only be explained by a substantial abundance of acetylene in the upper troposphere. Using a …

2003 • Icarus

eHST 5

Spectroscopic mode identification for the slowly pulsating B star HD 147394

DOI: 10.1051/0004-6361:20030086 Bibcode: 2003A&A...401..281B

Mathias, P.; Aerts, C.; Briquet, M. +2 more

We present ground-based high-resolution high S/N spectra of the slowly pulsating B star HD 147394. Two frequencies are clearly found in the moments of the Si II 4128-4130 doublet: f₁=0.8008 c d^-1 and f₂=0.7813 c d^-1. The frequency f₁ is also found in the HIPPARCOS data. A third frequency is al…

2003 • Astronomy and Astrophysics

Hipparcos 5

The metallicity of β Cephei stars on the basis of the satellite ultraviolet spectra

DOI: 10.1016/S0273-1177(02)00631-2 Bibcode: 2003AdSpR..31..387D

Niemczura, E.; Cugier, H.; Daszyńska, J.

We derive the mean stellar parameters like angular diameter, effective temperature, and metallicity from ultraviolet spectra for all β Cephei stars observed during the IUE satellite mission, including those belonging to the three open clusters. For this purpose we fit the theoretical flux distributions of Kurucz's models to observed low-resolution…

2003 • Advances in Space Research

IUE 5

The Ultraviolet Continuum Emission of FR I and FR II Radio Galaxies and a Proposal for a Unified AGN Model for FR I sources

DOI: 10.1086/323102 Bibcode: 2003AJ....125.1795Z

Baum, Stefi A.; Zirbel, Esther L.

This paper is the second in a series of two on the UV continuum emission (in the range from 1400 to 3700 Å) of radio galaxies that were extracted from the Hubble Space Telescope (HST) Archives. The sample consists of 31 3C and Parkes radio galaxies that have redshifts below 0.2 (the majority have redshifts of ~0.03) and radio powers of ~10^25<…

2003 • The Astronomical Journal

eHST 5

JEM-X observations of the Be/X-ray binary EXO 2030+375

DOI: 10.1051/0004-6361:20031205 Bibcode: 2003A&A...411L.411M

Reig, P.; Kretschmar, P.; Lund, N. +3 more

We have used data from the Joint European Monitor (JEM-X) to perform an X-ray spectral and timing analysis of the 42-s transient pulsar EXO 2030+375 during an X-ray outburst. X-ray pulsations are clearly detected with an average pulse period of 41.66+/-0.05 s and an average pulse fraction of 60%. The profile of the energy spectrum did not change a…

2003 • Astronomy and Astrophysics

INTEGRAL 5

Repeated Flaring from Loop-Loop Interaction

DOI: 10.1023/A:1023960716826 Bibcode: 2003SoPh..213..319P

Pohjolainen, S.

A series of solar flares was observed near the same location in NOAA active region 8996 on 18-20 May 2000. A detailed analysis of one of these flares is presented where the emitting structures in soft and hard X-rays, EUV, Hα, and radio at centimeter wavelengths are compared. Hard X-rays and radio emission were observed at two separate loop footpo…

2003 • Solar Physics

SOHO 5

Simultaneous retrieval of optical depths and scattering phase functions in Titan's atmosphere from Huygens/DISR data

DOI: 10.1016/j.pss.2003.06.002 Bibcode: 2003P&SS...51..991G

Keller, H. U.; Grieger, B.; Rodin, A. V. +1 more

In January 2005, the Huygens probe will descent through Titan's atmosphere and the Descent Imager/Spectral Radiometer (DISR) will perform upward and downward looking observations at various spectral ranges and spatial resolutions. One of the subinstruments, the Upward Looking Visible Spectrometer (ULVS), measures the total downward radiation flux …

2003 • Planetary and Space Science

Huygens 5