Search Publications
Systematic relations between the HIPPARCOS catalogue and major (fundamental) catalogues of the 20th century (Paper I)
Schwan, H.
This paper presents the systematic relations between the HIPPARCOS catalogue and some major catalogues of the 20th century, preferentially fundamental catalogues. These relations allow one to reduce observations given in the system of one of these catalogues to the HIPPARCOS system. Software for performing such a transition can be downloaded from …
Far-ultraviolet extinction and diffuse interstellar bands
Krełowski, J.; Megier, A.; Aiello, S. +2 more
We relate the equivalent widths of the major diffuse interstellar bands (DIBs) near 5797 and 5780Å with different colour excesses, normalized by E(B-V), which characterize the growth of interstellar extinction in different wavelength ranges. It is demonstrated that the two DIBs correlate best with different parts of the extinction curve, and the r…
Disks around hot stars in the Trifid nebula
Cernicharo, J.; Cesarsky, D.; Lefloch, B. +2 more
We report on mid-IR observations of the central region in the Trifid nebula, carried out with ISOCAM in several broad-band infrared filters and in the low resolution spectroscopic mode provided by the circular variable filter. Analysis of the emission indicates the presence of a hot dust component (500 to 1000 K) and a warm dust component at lower…
Markarian 478: A Second Seyfert Galaxy with 1 Micron Fe II Emission Lines
Hamann, F.; Rudy, Richard J.; Puetter, R. C. +3 more
We present infrared spectroscopy of the narrow-line Seyfert 1 galaxy Mrk 478 that shows the 1 µm Fe II lines λ9997, λ10501, λ10863, and λ11126. This is the second active galaxy, after I Zw 1, in which these features have been observed. Like I Zw 1, the 1 µm Fe II lines of Mrk 478 appear to arise from collisional excitation of their com…
Shocking Clouds in the Cygnus Loop
Graham, James R.; Levenson, N. A.
With Hubble Space Telescope Wide-Field Planetary Camera 2 observations of the Cygnus Loop supernova remnant, we examine the interaction of an interstellar cloud with the blast wave on physical scales of 1015 cm. The shock front is distorted, revealing both edge-on and face-on views of filaments and diffuse emission, similar to those obs…
A study of the chromospherically active binaries UX Fornacis and AG Doradus
Strassmeier, K. G.; Washuettl, A.
This paper presents a time-series spectrum analysis of the two chromospherically active binary stars, UX Fornacis and AG Doradus. To investigate the rotational behaviour, in combination with activity in the Hα line, we obtained almost 40 high-resolution, high-S/N spectra for each system. Both binaries, UX For and AG Dor, show Hα of the primary sta…
Erupting Magnetic Structures observed with SOHO/LASCO
Simnett, G. M.; Lyons, M. A.
We report observations, from March 1999 to December 1999, of slow-moving, low-mass (≲1014 g) erupting structures. The 20 events seen in this period appear with a double or multiple loop structure. Their speeds range from approximately 10 to 60 km s−1. There are no significant associated flares or radio signatures. Although th…
First Cluster results of the magnetic field structure of the mid- and high-altitude cusps
Balogh, A.; Dunlop, M. W.; Cargill, P. J. +1 more
Magnetic field measurements from the four Cluster spacecraft from the mid- and high-altitude cusp are presented. Cluster underwent two encounters with the mid-altitude cusp during its commissioning phase (24 August 2000). Evidence for field-aligned currents (FACs) was seen in the data from all three operating spacecraft from northern and southern …
The Cassini/Huygens Venus and earth flybys: An overview of operations and results
Burton, M. E.; Matson, D. L.; Buratti, B. +1 more
The Cassini/Huygens spacecraft flew by Venus on June 24, 1999, and the Earth on August 18, 1999. These two events provided the Cassini Project with its first opportunities to design coordinated scientific observations at planetary encounters. In addition to exercising capabilities of the science instruments as well as the spacecraft and performing…
Large-scale energetic particle layers in the high latitude Jovian magnetosphere
Anagnostopoulos, G. C.; Karanikola, I.; Marhavilas, P.
This study presents an analysis of long lasting (∼2- 3 h) energetic (≳60 keV) ion and (≳40 keV) electron events observed by the HISCALE instrumentation on board Ulysses in the high latitude Jovian magnetosphere. The high latitude events in the prenoon dayside (d 36-38, 1992) and the south duskside (d 40-43, 1992) magnetosphere are different from t…