Search Publications
Symbiotic Nova V1016 Cyg as Interacting Binary
Chochol, D.; Pribulla, T.; Parimucha, S.
Long-term UBV photoelectric and photographic photometry of the symbiotic nova V1016 Cyg is discussed. The pre-outburst brightening in 1949, main nova-like outburst in 1964 and two small brightenings in 1980 and 1994 suggest 15.1±0.2 years period of activity. It is shown that a variation in the (J-K) colour index as well as that in the UV continuum…
V505 Mon - An early-type binary with a disk
Chochol, D.; Drechsel, H.; Lorenz, R. +4 more
New spectra of the eclipsing binary V505 Mon (usually classified as B5 Ib) were obtained in the optical and UV regions. Only spectral lines of one component are visible, with K = 93 km s-1. According to arguments based on the extent of the disk the mass ratio might be about 0.30. The star with the visible spectral lines would then have …
The Jovian HOM and bKOM radio emissions observed by Wind//WAVES and by Ulysses//URAP
MacDowall, R. J.; Kaiser, M. L.; Lecacheux, A. +1 more
During 1995 and into 1996, both the Jovian hectometric radio emission (HOM) and the Jovian broadband radio emission (bKOM) were received occasionally by the Radio and Plasma Wave Investigation (WAVES) on board the Wind spacecraft and by the Unified Radio and Plasma Experiment (URAP) on board the Ulysses spacecraft. Ulysses was then at distances of…
The cosmic ray radial and latitudinal gradients in the heliosphere near solar minima
Zhang, M.; McDonald, F. B.
Based on existing measurements of galactic and anomalous cosmic ray gradients obtained by the heliopsheric network spacecraft in the last three solar minima, we found that there is an approximately linear relationship between the magnitudes of the radial gradient and latitudinal gradient. Cosmic rays of a particular species/energy that exhibit a l…
Fragmented structure of interplanetary type II bursts
MacDowall, R. J.; Thejappa, G.
We present the Ulysses observations of a highly fragmented interplanetary type II burst and an associated pair of forward shocks. We argue that the coupling of Langmuir waves excited by one of these shocks with escaping radiation at the sharp density gradient associated with the companion shock is responsible for the clumpiness of the type II even…
NIR Narrow- and Broad-Band Study of the SSA 22 Field
Tamura, Naoyuki; Ohta, Kouji; Takata, Tadafumi +4 more
Deep narrow- and broad-band near-infrared imaging observations of the central 2'×2' region of the SSA 22 field were made with the near-infrared camera (CISCO) attached to the Subaru Telescope. Using a narrow-band filter centered at 2.033µm, [O III] λ5007 emitters at z ~ 3.06 +/- 0.02 were searched to examine star-forming activities in an ove…
The Ulysses Fast Latitude Scan at Solar Maximum: COSPIN/LET energetic particle observations
Forsyth, R. J.; Sanderson, T. R.; Marsden, R. G. +3 more
Having completed the second survey of the southern polar regions of the heliosphere in late 2000, the Ulysses spacecraft is presently engaged in its second so-called Fast Latitude Scan (FSL). During this phase of the out-of-ecliptic orbit, the spacecraft makes a rapid transit from south to north, covering 160° in solar latitude in less than 320 da…
Stellar and circumstellar evolution of long period variable stars
Luri, X.; Mennessier, M. O.
In a first paper, HIPPARCOS astrometric and kinematic data were used to calibrate both infrared K and IRAS luminosities at the same time as kinematic parameters of Long Period Variable stars (LPVs). Individual estimated absolute magnitudes and a probabilistic assignation to galactic populations were deduced from these calibrations for each LPV of …
Radial velocities of giant M stars near the ecliptic
Bettoni, D.; Galletta, G.
A search dedicated to the identification of new, dwarf and cold stars close to the Sun has allowed us to measure the radial velocities of a set of stars of late spectral type. The stars selected were M-type stars present in the Hipparcos Input Catalogue located in a strip of +/-20° around the Ecliptic and observables from La Silla. Our inal set co…
Comparison of quiet-Sun radiances measured by CDS and SUMER on SOHO
Solanki, S. K.; Wilhelm, K.; Schühle, U. +6 more
Since the beginning of the SOHO (Solar and Heliospheric Observatory) mission an intercalibration programme was carried out which included simultaneous observations of the EUV instruments CDS (Coronal Diagnostic Spectrometer) and SUMER (Solar Ultraviolet Measurements of Emitted Radiation) of common targets on the quiet Sun. The observations in the …