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A study of the two northern open clusters NGC 1582 and NGC 1663
Baume, G.; Villanova, S.; Carraro, G.
We present CCD UBV(I)C observations obtained in the field of the previously unstudied northern open clusters NGC 1582 and NGC 1663. For the former, we also provide high-resolution spectra of the brightest stars and complement our data with Two-Micron All-Sky-Survey (2MASS) near-infrared photometry and with astrometric data from the Tych…
The Whisper Relaxation Sounder Onboard Cluster: A Powerful Tool for Space Plasma Diagnosis1, 2 around the Earth
Décréau, P. M. E.; Canu, P.; Darrouzet, F. +3 more
The WHISPER relaxation sounder that is onboard the four CLUSTER spacecraft has as its main scientific objectives to monitor the natural waves in the 2 kHz-80 kHz frequency range and, mostly, to determine the total plasma density from the solar wind down to the Earth's plasmasphere. To fulfill these objectives, the WHISPER uses the two long double …
Near-Infrared Observations of Powerful High-Redshift Radio Galaxies: 4C 40.36 and 4C 39.37
Armus, L.; Egami, E.; Matthews, K. +4 more
We present near-infrared imaging and spectroscopic observations of two Fanaroff-Riley type II high-redshift radio galaxies (HzRGs), 4C 40.36 (z=2.3) and 4C 39.37 (z=3.2), obtained with the Hubble Space Telescope and the Keck and Hale Telescopes. High-resolution images were taken with filters both in and out of strong emission lines, and together w…
The Ulysses fast latitude scans: COSPIN/KET results
Kunow, H.; Wibberenz, G.; Posner, A. +6 more
Ulysses, launched in October 1990, began its second out-of-ecliptic orbit in December 1997, and its second fast latitude scan in September 2000. In contrast to the first fast latitude scan in 1994/1995, during the second fast latitude scan solar activity was close to maximum. The solar magnetic field reversed its polarity around July 2000. While t…
Advances in magnetospheric radio wave analysis and tomography
Gurnett, D. A.; Escoubet, C. P.; Pickett, J. S. +7 more
Initial theoretical studies of multi-spacecraft radio tomographic imaging of the magnetosphere have shown the potential scientific value of the technique. We report a series of multistatic radio propagation experiments with the goal of testing and verifying the capabilities of radio tomography. These experiments focused specifically on measuring t…
Balmer absorption variability and the disc wind of V592 Cassiopeiae
Prinja, R. K.; Wagner, R. M.; Howell, S. B. +1 more
We present results from time-series optical spectroscopy of the low-inclination, nova-like cataclysmic variable, V592 Cas. The data span the wavelength range from ~4000 to 5000 Å, and include Balmer lines (Hβ to Hɛ) as well as He I and He II. The Balmer lines are generally characterized by shallow absorption troughs with superimposed narrower cent…
A Detailed Analysis of the Operational Orbit of the Hipparcos Satellite
van Leeuwen, Floor; Dalla Torre, Andrea
An analysis of the orbital evolution of the ESA's Hipparcos satellite is presented. Hipparcos operated between August 1989 and March 1993 in a highly elliptical orbit: a geostationary transfer orbit with increased perigee height. The requirements of the scientific mission included high accuracy knowledge of the position and velocity vectors of the…
Time resolved spectroscopy of GRB 030501 using INTEGRAL
Götz, D.; Mereghetti, S.; von Kienlin, A. +8 more
The gamma-ray instruments on-board INTEGRAL offer an unique opportunity to perform time resolved analysis on GRBs. The imager IBIS allows accurate positioning of GRBs and broad band spectral analysis, while SPI provides high resolution spectroscopy. GRB 030501 was discovered by the INTEGRAL Burst Alert System in the ISGRI field of view. Although t…
Variability of the H_alpha and Na I D Line Profiles in the Spectrum of FU Ori
Errico, L.; Lamzin, S. A.; Vittone, A.
The variations of line profiles in the spectrum of FU Ori during several consecutive nights, from January 3 through January 8, 1999, have been traced for the first time in the entire history of studying this star. The variations of the H_alpha and Na I D line profiles are regular in pattern; at each time, the profiles of these lines were similar t…
Hubble Space Telescope Observations of the Old Nova DI Lacertae
Szkody, Paula; Sion, Edward M.; Starrfield, Sumner +3 more
We have carried out a synthetic spectral analysis of a Hubble Space Telescope Space Telescope Imaging Spectrograph observation of the old nova DI Lacertae (Nova Lacerta 1910). The spectrum, obtained with the E140M disperser, reveals a rising continuum shortward of 1560 Å, a C IV P Cygni profile indicative of wind outflow associated with disk accre…