Search Publications
Multiwavelength evidence for a 15-year periodic activity in the symbiotic nova V1016 Cygni
Chochol, D.; Buson, L. M.; Vittone, A. A. +2 more
The ~ 15.1 years period found in the long-term UBV photoelectric and photographic photometry of the symbiotic nova V1016 Cyg is detected also in the (J-K) colour index and in the UV continuum and emission line fluxes from IUE and HUT spectra. It could be interpreted either as the effect of recurrent enhanced mass loss episodes from the Mira type v…
Asteroids observations with the Hubble Space Telescope. I. Observing strategy, and data analysis and modeling process
Lattanzi, M.; Tanga, P.; Berthier, J. +5 more
Five main belt asteroids and one Trojan - selected mainly on the basis of their possible binary nature as deduced from light curve morphology - have been observed with the Fine Guidance Sensors (FGS#3 and FGSR#1) of the Hubble Space Telescope (HST). In this first paper we present the selection and observation strategy, data reduction and analysis.…
Search for duplicity in periodic variable Be stars
Carrier, F.; Burki, G.; Burnet, M.
Four Be stars,
On the theory of MAG waves and a comparison with sunspot observations from CDS/SoHO
Doyle, J. G.; Poedts, S.; Banerjee, D. +2 more
We examine the influence of non-adiabatic effects on the modes of an isothermal stratified magnetic atmosphere. We present new solutions for magneto-acoustic-gravity (or MAG) waves in the presence of a radiative heat exchange based on Newton's law of cooling. An analytic expression for the dispersion relation is derived, which allows the effect of…
Intermittent behavior in the transition region and the low corona of the quiet Sun
Vial, J. -C.; Patsourakos, S.
We present an analysis of light-curves obtained in the O IV and Ne VIII transition region and low corona lines, that were simultaneously recorded in a quiet Sun region by SUMER/SOHO. By using the flatness spectrum of the observed light-curves we searched for intermittency signatures. It was found that a significant proportion of points in the obse…
A photometric study of the two poorly known northern open clusters NGC 133 and NGC 1348
Carraro, G.
We present CCD UBVI observations obtained in the field of the previously unstudied northern open clusters NGC 133 and NGC 1348. We argue that NGC 133 is a heavily contaminated cluster, for which we identify 13 candidate members down to V=14.50 mag on the basis of the position in the two-color Diagram. Membership has been checked against proper mot…
Thick disk and old disk carbon-rich giants in the Sun vicinity
Bergeat, J.; Knapik, A.; Rutily, B.
Making use of the HIPPARCOS data and refining a previous study of the space distribution of the carbon-rich giant stars located in the vicinity of the Sun (Paper I), we fully investigate their space distributions and space velocities on the basis of our photometric grouping (CVi i.e. carbon variable stars with i=1 to 7; HCj i.e. hot carbon stars w…
The ISO Galactic metallicity gradient revisited
Morisset, C.; Sternberg, A.; Giveon, U.
Two independent groups (Giveon et al. \cite{giveon}; Martín-Hernández et al. \cite{martin}) have recently investigated the Galactic metallicty gradient as probed by ISO observations of mid-infrared emission-lines from HII regions. We show that the different gradients inferred by the two groups are due to differing source selection and differing ex…
First XMM-Newton observations of the globular cluster M 22
Webb, N. A.; Barret, D.; Gendre, B.
We have examined preliminary data of the globular cluster, M 22, from the EPIC MOS detectors on board XMM-Newton. We have detected 27 X-ray sources within the centre of the field of view, 24 of which are new detections. Three sources were found within the core of the cluster. From spectral analysis of the X-ray sources, it is possible that the obj…
Determination of limits on disc masses around six pulsars at 15 and 90 µm
Pantin, E.; Sauvage, M.; Naylor, T. +3 more
We have searched for evidence of emission at 15 µm with ISOCAM and at 90 µm with ISOPHOT from dust orbiting six nearby pulsars, both in binaries and in isolation, located at distances between about 100 to 1000 pc. No emission was detected at any of the pulsar positions, and for the nearest pulsar J0108-1431 the 3 sigma ma upper limits …