Search Publications
Intensity variations in EIT shutterless mode: Waves or flows?
Berghmans, D.; van Driel-Gesztelyi, L.; Poedts, S. +1 more
On 11 July 2001 an EIT shutterless campaign was conducted which provided 120 high-cadence (68 s) 304 Å images of the north eastern quarter of the Sun. The most interesting feature seen in the data is an off-limb half loop structure along which systematic intensity variations are seen which appear to propagate from the top of the loop towards its f…
HST/WFPC2 morphologies and color maps of distant luminous infrared galaxies
Pelat, D.; Flores, H.; Hammer, F. +2 more
Using HST/WFPC2 imaging in F606W (or F450W) and F814W filters, we obtained the color maps in observed frame for 36 distant (0.4 < z < 1.2) luminous infrared galaxies (LIRGs, LIR(8-1000 µm) ≥ 1011 L⊙), with average star formation rates of ∼100 M⊙ yr-1. Stars and compact sources are …
VLT spectroscopy of globular cluster systems. I. The photometric and spectroscopic data set
Saglia, R. P.; Thomas, D.; Bender, R. +6 more
We present Lick line-index measurements of extragalactic globular clusters in seven early-type galaxies (NGC 1380, 2434, 3115, 3379, 3585, 5846, and 7192) with different morphological types (E-S0) located in field and group/cluster environments. High-quality spectra were taken with the FORS2 instrument at ESO's Very Large Telescope. ∼50% of our da…
Properties of the nuclei of Centaurs Chiron and Chariklo
Jorda, L.; Lamy, P.; Groussin, O.
We analyze visible, infrared, radio and spectroscopic observations of 2060 Chiron in a synthetic way to determine the physical properties of its nucleus. From visible observations performed from 1969 to 2001, we determine an absolute V magnitude for the nucleus of 7.28±0.08 with an amplitude of 0.16±0.03, implying a nearly spherical nucleus with a…
The ISOPHOT - MAMBO survey of 3CR radio sources: Further evidence for the unified schemes
Meisenheimer, K.; Siebenmorgen, R.; Krause, O. +9 more
We present the complete set of ISOPHOT observations of 3CR radio galaxies and quasars, which are contained in the ISO Data Archive, providing 75 mid- and far-infrared spectral energy distributions (SEDs) between 5 and 200 µm. For 28 sources they are supplemented with MAMBO 1.2 mm observations and for 15 sources with new submillimetre data fr…
The XMM-NEWTON Ω project. I. The X-ray luminosity-temperature relation at z>0.4
Bartlett, J. G.; Giard, M.; Nichol, R. C. +9 more
We describe XMM-Newton Guaranteed Time observations of a sample of eight high redshift (0.45<z<0.62) clusters. The goal of these observations was to measure the luminosity and the temperature of the clusters to a precision of ∼10%, leading to constraints on the possible evolution of the luminosity-temperature (Lx-Tx) re…
Key parameters of W UMa-type contact binaries discovered by HIPPARCOS
Selam, S. O.
A sample of W UMa-type binaries which were discovered by the HIPPARCOS satellite was constructed with the aid of well defined selection criteria described in this work. The selection process showed up that several systems of which the variability types have been assigned as EB in HIPPARCOS catalogue are genuine contact binaries of W UMa-type. The …
Rings in the haloes of planetary nebulae
Corradi, R. L. M.; Sánchez-Blázquez, P.; Mellema, G. +2 more
We present a search for rings or arcs in the haloes of planetary nebulae (PNe). We discovered such structures in eight PNe, tripling the sample of PNe with known rings. This shows that, contrary to what was believed to date, the occurrence of mass loss fluctuations with timescales of 102-103 yrs at the end of the asymptotic g…
Two-dimensional spectroscopy of a sunspot. I. Properties of the penumbral fine structure
Bellot Rubio, L. R.; Schlichenmaier, R.; Tritschler, A. +3 more
We investigate the properties of the fine structure of a sunspot penumbra based on spectroscopic measurements with high spectral (λ/δλ=250 000) and high spatial (≈0.5 arcsec) resolution. The magnetically insensitive Fe I 557.6 nm line is used to probe the penumbral atmosphere. The data was taken at the German Vacuum Tower Telescope with the 2D-spe…
Far Infrared mapping of NGC 891
Tuffs, R. J.; Kylafis, N. D.; Madore, B. F. +1 more
We present deep maps of dust emission from the edge-on spiral galaxy NGC 891, obtained with the ISOPHOT instrument on board the Infrared Space Observatory in broad band filters with reference wavelengths centered on 170 and 200 µm. Using new processing methods to remove the effects of detector transients from the data, we detect cold dust at…