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Helium, Carbon and Silicon Abundances in the HW VIR Eclipsing Binary Subdwarf-B Primary
Lynas-Gray, A. E.; Mortimore, A. N.
Light curve solutions show HW Vir and PG 1336-018 to be remarkably similar eclipsing binaries. The subdwarf-B (sdB) primary of PG 1336-018 is a pulsator but pulsation is not detected in the sdB primary of HW Vir. Ultraviolet spectra were used to obtain carbon and silicon abundances in the sdB primary of HW Vir; in due course these should be compar…
Modeling the Evolution of Dusty Starburst Galaxies in Multiband Deep Surveys
Wang, Y. P.
We model the constraints set on the evolution of dusty starburst galaxies by the current deep extragalactic surveys performed in the far-infrared with Spitzer, and at radio wavelengths with the VLA. Our models fit the number counts in all the available spectral bands well and also provide a reasonably close match to the redshift distribution of th…
Great Storm Particle Event on 2000 August 11 Observed by SOHO ERNE
Riihonen, E.; Torsti, J.; Mäkelä, P. +1 more
We report on an energetic storm particle event on 2000 August 11 observed by ERNE on board SOHO. A large-intensity enhancement started simultaneously in all energy channels between 2 and 50 MeV at 11 UT. The concurrence of the onsets indicates the local nature of the particle event. Intensities increased 100-fold from the background level before 1…
Probing the ionized ISM of the CSS quasar 3C 277.1. I. Observations
Fanti, R.; Cotton, W. D.; Fanti, C. +2 more
We present new multi-wavelength high resolution VLA polarimetric images of the CSS quasar 3C 277.1 and analyze them with older Merlin and HST [OIII] images. These observations were made to test the hypothesis that the [OIII] emission as well as the long wavelength radio opacity arise in shocks that the quasar jet induces in the ISM. The multi-wave…
Multiwavelength Analyses of Faint Infrared Galaxies
Berta, Stefano
The present work follows a chronological outline covering the development of infrared space facilities in recent decades. The Infrared Astronomical Satellite (launched in 1984), Infrared Space Observatory (1995), and Spitzer Space Telescope (2003 August) constitute a logical sequence in the study of galactic infrared properties, with a well-modula…
Contribution to the study of binaries with spectral types F, G, K, and M XI. Orbital elements of three red-giant spectroscopic binaries: HR 1304, HR 1908, and HD 126947
Griffin, R. F.; Prieur, J. -L.; Carquillat, J. -M.
The orbital elements of three red-giant single-lined spectroscopic binaries, HR 1304, HR 1908 and HD 126947, are presented. They are obtained from observations made with two photoelectric spectrometers of CORAVEL type, the first located at the Observatoire de Haute-Provence and the second at the Cambridge Observatories. HR 1304 and HR 1908 are kno…
First ground-based photometry and light-curve analysis of the eccentric eclipsing binary V744 Cas
Bulut, İ.; Erdem, A.; Bakis, V. +3 more
The first ground-based BVR photometric observations of the recently discovered eclipsing binary V744 Cas are presented. From these measurements, timings for two primary and one secondary minima have been calculated. The light curves of the system were analyzed by using the Wilson-Devinney program. The analysis shows that the system is detached wit…
Laboratory astrophysics and atomic physics using the NASA/GSFC microcalorimeter spectrometers at the LLNL electron beam ion trap and radiation properties facility
Boyce, K. R.; Kilbourne, C. A.; Porter, F. S. +10 more
The 32 pixel laboratory microcalorimeter spectrometer built by the NASA/Goddard Space Flight Center (GSFC) is now an integral part of the spectroscopy suite used routinely by the electron beam ion trap and radiative properties group at the Lawrence Livermore National Laboratory. The second generation laboratory instrument, dubbed the XRS/EBIT, is …
XMM-Newton Detection of the Rare Fanaroff-Riley Type II Broad Absorption Line Quasar FIRST J101614.3+520916
White, Richard L.; Gregg, Michael D.; Lacy, Mark +5 more
We have detected FIRST J101614.3+520916 with the XMM-Newton X-ray observatory. FIRST J101614.3+520916, one of the most extreme radio-loud, broad absorption line (BAL) quasars so far discovered, is also a Fanaroff-Riley type II radio source. We find that, compared to its estimated intrinsic X-ray flux, the observed X-rays are likely suppressed and …
The MEGA Project for Medium Energy Gamma-ray Astronomy
Hartmann, D. H.; Ajello, M.; Di Cocco, G. +22 more
The Medium Energy Gamma-ray Astronomy (MEGA) telescope concept will soon be proposed as a MIDEX mission. This mission would enable a sensitive all-sky survey of the medium-energy gamma-ray sky (0.4 50 MeV) and bridge the huge sensitivity gap between the COMPTEL and OSSE experiments on the Compton Gamma Ray Observatory and the visionary Advanced Co…