Search Publications
Calibration of the PRONAOS/SPM submillimeter photometer
Bernard, J. -P.; Dupac, X.; Giard, M. +12 more
Context: .
Aims: .PRONAOS is a stratospheric balloon-borne project dedicated to submillimeter astronomy. Sensitive to low emission gradients, PRONAOS allowed pointed observations in four photometric bands between 200 µm and 1.2 mm with an angular resolution of 2' to 3.5'. We present here the PRONAOS calibration strategy and the accuracy …
Multi-aperture photometry of extended IR sources with ISOPHOT. I. The nature of extended IR emission of planetary Nebulae
Walker, H. J.; Richards, P. J.; Müller, T. G. +2 more
Context: .ISOPHOT multi-aperture photometry is an efficient method to resolve compact sources or to detect extended emission down to relatively faint levels with single detectors in the wavelength range 3 to 100 µm.
Aims: .Using ISOPHOT multi-aperture photometry and complementary ISO spectra and IR spectral energy distributions we discus…
Multifractality in a ring of star formation: the case of Arp 220
de La Fuente Marcos, R.; de La Fuente Marcos, C.
Context: .Formation of super star-clusters can be triggered during the final stages of galaxy mergers or galactic interactions, when significant numbers of massive stars are formed out of large gas-cloud systems. Giant cloud complexes show a fractal structure due to turbulence and/or self-gravitation; therefore, super clusters formed out of these …
Arp 116: interacting system or chance alignment?
de Grijs, R.; Robertson, A. R. I.
Using high spatial resolution Hubble Space Telescope/Advanced Camera for Surveys archival imaging observations of
Multi-wavelength study of a high velocity event near a sunspot
Doyle, J. G.; Banerjee, D.; O'Shea, E. +1 more
Context: .Jets with velocities higher than 200 km s-1 are often observed in the X-ray spectral range in the solar atmosphere, however, very few such objects are observed in the EUV range.
Aims: .We report on an eruptive event observed in the south-west side of a sunspot, within active region, AR0554, in a range of spectral lines for…
Radial mean velocity in the solar neighbourhood
Cubarsi, R.; Alcobé, S.
A large sample with the full space motions drawn from the Hipparcos Catalogue allows us to select some nested subsamples containing an increasing number of thick disk stars. Segregated thick disk populations show a progressive decreasing vertex deviation according to a trend of axial symmetry, as well as an increasing velocity dispersion and mean …
Swift and XMM-Newton observations of the dark GRB 050326
Campana, S.; Tagliaferri, G.; Cusumano, G. +30 more
We present Swift and XMM-Newton observations of the bright gamma-ray burst GRB 050326, detected by the Swift Burst Alert Telescope. The Swift X-Ray Telescope (XRT) and XMM-Newton discovered the X-ray afterglow beginning 54 min and 8.5 h after the burst, respectively. The prompt GRB 050326 fluence was (7.7±0.9) × 10-6 erg cm-2…
Doppler redistribution of anisotropic radiation and resonance polarization in moving scattering media. Predicted results for the coronal O VI 1032 Å line
Raouafi, N. -E.; Sahal-Bréchot, S.
The present paper puts the Doppler redistribution theory of anisotropic radiation and resonance polarization in moving scattering media into a predictive application following Sahal-Bréchot et al. (1998, A&A, 340, 579; P{{II}}), using the example of the O VI 1032 Å line of the corona. Numerical results are presented for different heights over …
X-ray variability of NGC 2516 stars in the XMM-Newton observations
Micela, G.; Peres, G.; Marino, A. +1 more
We present the characteristics of the X-ray variability of stars in the cluster NGC 2516 as derived from XMM-Newton/EPIC/pn data. The X-ray variations on short (hours), medium (months), and long (years) time scales have been explored. We detected 303 distinct X-ray sources by analysing six EPIC/pn observations; 194 of them are members of the clust…
FH Leonis, the first dwarf nova member of a multiple star system?
Vogt, N.
Aims.Sudden brightenings of HD 96273 or BD+07 2411B were observed with the HIPPARCOS satellite in 1992, which still require a convincing explanation.
Methods: .A new analysis of all known data of these two stars is given, including additional information on the Balmer line equivalent widths.
Results: .The brightenings can be explained as S…