Search Publications
Mira kinematics in the post-Hipparcos era
Schilbach, E.; Kharchenko, N.; Malkov, O. +1 more
The complete data set of Mira variables from the 4th edition of the General Catalog of Variable Stars was analyzed and supplemented by the proper motions and radial velocities presently available for Miras. The resulting sample of 724 Miras with periods between 78 and 612 days contains proper motions reduced to the Hipparcos system, radial velocit…
XMM-Newton observations of MR Vel/RX J0925.7-4758
Motch, C.; Neiner, C.; Bearda, H.
We report on XMM-Newton observations of the galactic supersoft X-ray source
Stokes parameters of resonance lines scattered by a moving, magnetic medium. Theory of the two-level atom
Raouafi, N. -E.
The aim of the present work is to present theoretical results on the Stokes parameters of a resonance spectral line, scattered by moving atoms (or ions) in the presence of a local magnetic field. We assume that the scattered line is sensitive to the Hanle effect due to the magnetic field and also to Doppler redistribution due to the atomic motions…
A study of accretion discs around rapidly rotating neutron stars in general relativity and its applications to four low mass X-ray binaries
Bhattacharyya, Sudip
We calculate the accretion disc temperature profiles, disc luminosities and boundary layer luminosities for rapidly rotating neutron stars considering the full effect of general relativity. We compare the theoretical values of these quantities with their values inferred from EXOSAT data for four low mass X-ray binary sources: XB 1820-30, GX 17+2, …
HD 112 mu m in absorption and extreme CO depletion in a cold molecular cloud
Maret, S.; Ceccarelli, C.; Pagani, L. +3 more
We present ISO-LWS observations at high spectral resolution (R ~ 104) towards a cold molecular cloud in the line of sight of W49. The HD ground state transition at 112 mu m is detected, showing the first observation of this line in absorption outside the solar system. The 112 mu m absorption depth gives a straightforward measure of the …
The 3-D ionization structure of the planetary nebula NGC 6565
Sabbadin, F.; Turatto, M.; Cappellaro, E. +2 more
A detailed study of the planetary nebula NGC 6565 has been carried out on long-slit echellograms (lambda /Delta lambda =60 000, spectral range = lambda lambda 3900-7750 Å) at six, equally spaced position angles. The expansion velocity field, the c(Hβ ) distribution and the radial profile of the physical conditions (electron temperature and density…
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…