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Iron in Hot DA White Dwarfs
Vennes, Stéphane; Lanz, Thierry; Chayer, Pierre +1 more
We present a study of the iron abundance pattern in hot, hydrogen-rich (DA) white dwarfs. The study is based on new and archival far-ultraviolet spectroscopy of a sample of white dwarfs in the temperature range 30,000 K<~Teff<~64,000 K. The spectra obtained with the Far Ultraviolet Spectroscopic Explorer, along with spectra obtain…
The nature of ultraviolet spectra of AG Pegasi and other symbiotic stars: locations, origins, and excitation mechanisms of emission lines
Wahlgren, G. M.; Johansson, S.; Eriksson, M.
A detailed study of ultraviolet spectra of the symbiotic star AG Peg has been undertaken to derive the atomic excitation mechanisms and origin of formation for the lines common in symbiotic systems. More than 600 emission lines are observed in spectra from {IUE}, {HST} and {FUSE} of which 585 are identified. Population mechanisms and origin of for…
A Search for Early Optical Emission at Gamma-Ray Burst Locations by the Solar Mass Ejection Imager (SMEI)
Band, David L.; Jackson, Bernard V.; Buffington, Andrew +2 more
The Solar Mass Ejection Imager (SMEI) views nearly every point on the sky once every 102 minutes and can detect point sources as faint as R~10 mag. Therefore, SMEI can detect or provide upper limits for the optical afterglow from gamma-ray bursts in the tens of minutes after the burst, when different shocked regions may emit optically. Here we pro…
Enhanced transport in the polar mesosphere of Jupiter: Evidence from Cassini UVIS helium 584 Å airglow
Parkinson, C. D.; Stewart, A. I. F.; Wong, A. S. +2 more
The eddy diffusion profile (K) in the auroral regions of Jupiter is not well determined. However, because of the intense auroral energy input, eddy mixing is expected to be much more effective and may be responsible for the enhancement of heavy hydrocarbon production in the polar region. In this paper, we estimate the increased eddy mixing in the …
Non-Uniform Temperature Distribution in the Galaxy Clusters 2A 0335+096 and Abell 496 Observed by XMM-Newton
Kunieda, Hideyo; Furuzawa, Akihiro; Tawara, Yuzuru +2 more
We present the XMM-Newton results of the galaxy clusters 2A 0335+096 and A496. From an investigation of 2-dimensional ICM profiles, we obtained new features related to dynamical activities in the ICM. In 2A 0335+096, we found a spiral cool tail around the central cold core, which is trailing from the opposite side of the cold front observed by Cha…
Nucleosynthesis of 60Fe in massive stars
Limongi, Marco; Chieffi, Alessandro
We discuss certain aspects of the production of 60Fe in massive stars in the range between 11 and 120M⊙, both in the hydrostatic and explosive stages. We also compare the 60Fe/26Al γ-ray line flux ratio obtained in the present calculations to the detected value reported by INTEGRAL/SPI.
X-Ray Emission from the Double Neutron Star Binary B1534+12: Powered by the Pulsar Wind?
Garmire, G. P.; Pavlov, G. G.; Kargaltsev, O.
We report the detection of the double neutron star binary (DNSB) B1534+12 (=J1537+1155) with the Chandra X-Ray Observatory. This DNSB (Porb=10.1 hr) consists of the millisecond (recycled) pulsar J1537+1155A (PA=37.9 ms) and a neutron star not detected in the radio. After the remarkable double pulsar binary J0737-3039, it is t…
Warm-hot intergalactic medium contribution to baryonic matter
Sołtan, A. M.
Context: .Hydrodynamical simulations indicate that a substantial fraction of baryons in the universe remains in a diffuse component - warm-hot intergalactic medium (WHIM).
Aims: .The goal of this paper is to determine the physical properties (spatial distribution, temperature, and density) of the WHIM.
Methods: .Spatial structure of the so…
Supersoft sources in XMM-Newton Small Magellanic Cloud fields. A symbiotic and a close binary or cooling neutron star
Haberl, F.; Kahabka, P.
We report the detection and study of two faint ROSAT supersoft X-ray sources in the SMC field with XMM-Newton, RX J0059.1-7505 and RX J0059.4-7118. Due to the larger effective area of XMM-Newton we can constrain the X-ray spectra of both sources. RX J0059.1-7505 is optically identified with the symbiotic LIN 358 in the SMC. A 20 eV blackbody compo…
Physical properties of Titan's surface at the Huygens landing site from the Surface Science Package Acoustic Properties sensor (API-S)
Lorenz, R. D.; Hagermann, A.; Leese, M. R. +6 more
We present the results from the first sonar to be deployed outside of Earth, and the first active acoustic instrument on Titan, onboard the Huygens probe, and the implications of its data for the geomorphology and characteristics of the Huygens landing site. Signals were recorded from 90 m downwards until impact, with a maximum sensor footprint di…