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Sunshine, Earthshine and Climate Change I. Origin of, and Limits on Solar Variability
Dziembowski, W. A.; Goode, Philip R.
High resolution spectroscopy of HD 207538 from Far-UV (FUSE) to Visible (SARG-TNG). A global picture of the stellar and interstellar features modeled
Leone, F.; André, M. K.; Sonnentrucker, P. +1 more
We present a detailed study of the suspected Chemically Peculiar star HD 207538 based on high resolution spectroscopy in the far Ultraviolet (1000-3350 Å) and visible (4600-7000 Å) ranges. The stellar abundance synthesis analysis was performed by using Kurucz's codes ATLAS9 and SYNTHE to compute the atmospheric model and the synthetic spectrum res…
A spherical model for computing polarized radiation in Titan's atmosphere
Keller, Horst U.; Grieger, Björn; Salinas, Santo V. +1 more
The Huygens descent through Titan's atmosphere in January 2005 will provide invaluable information about Titan's atmospheric composition and aerosol properties. The Descent Imager/Spectral Radiometer (DISR) will perform upward and downward looking radiation observations at various spectral ranges and spatial resolutions. To prepare the DISR data i…
How Many Active Galaxies and QSOs Will Future Space Missions Detect?
Spinoglio, Luigi; Malkan, Matthew A.; Andreani, Paola
Averaged spectral energy distributions (SEDs) of active and starburst galaxies, from the 12 µm sample in the local universe, and QSOs, from an optically selected sample at a mean redshift <z>=0.7, are built from optical, near-IR, and far-IR (FIR; IRAS and Infrared Space Observatory) photometric observations. These SEDs are then used to…
New detections of optical emission from kiloparsec-scale quasar jets
Cheung, C. C.; Wardle, J. F. C.; Chen, Tingdong +1 more
We report initial results from the detection of optical emission in the arcsecond-scale radio jets of two quasars utilizing images from the Hubble Space Telescope archive. The optical emission has a very knotty appearance and is consistent with synchrotron emission from highly relativistic electrons in the jet. Combining these observations with th…
A comparison of some astrometric catalogues with the use of stars with large proper motions
Yatsenko, A. I.; Ivanov, G. A.
Pairwise differences of positions and proper motions of stars from the catalogues HIPPARCOS, CMC11, FONAC, NPM1, and PPM were used to determine their random and systematic errors. A significant relationship between differences of coordinates and proper motions of stars and their B-V colour indices was found for some pairs of the catalogues.
Mars express orbit design
Hechler, M.; Yanez, A.
This paper gives a survey of the orbit design, mission analysis aspects for Mars Express, the ESA mission to Mars. The emphasis is on those features which are unconventional. These are: the launch window with only 9 flight programs on the Fregat launcher upper stage for 30 launch days, and the re-targeting and Planetary protection strategy during …
Close pairs of quasars with different redshifts: New observations and results
Surdej, J.; Iovino, A.; Lee, D. W. +4 more
Burbidge et al. (\cite {burbidge}) argue that the observed number of quasar pairs with small angular separations and different redshifts (typically Delta theta <= 5 arcsec and Delta z > 0.1 ) is not compatible with a random distribution of quasars over the sky. After a brief review of all known quasar pairs with different redshifts, we show …
Ultraviolet Spectroscopy of the Massive LMC Multiple Systems Sk-67^0m#circ;18 (Br 5) and HD 36402 (Br 31)
Koenigsberger, G.; Auer, L. H.; Moffat, A. F. J.
Following previous IUE-based spectroscopic studies of WR+O binaries in the Galaxy and in the SMC, we present a similar study of the two systems, Br 5 [O3 If^*(+O) + O8-B0 I(+OB?)] and Br 31 [WC4(+O?) + O8 I:] in the Large Magellanic Cloud. We detect wind eclipse effects in the WC4+O (P = 3.033 d) pair in Br 31 similar to, but weaker than those obs…
Flares From the Giant ar 9433 on 24 April 2001
Uddin, Wahab; Chandra, Ramesh; Joshi, Anita
We present Hα CCD observations of three small-to-medium-size two-ribbon flares observed in the giant AR 9433 on 24 April 2001. Flare observations at other associated wavelengths (e.g., soft X-rays (SXR), hard X-rays (HXR), microwaves (MW)) obtained from archives are also presented and compared. We have tested the Neupert effect for the most energe…