Search Publications
An X-ray selected sample of radio-loud quasars
Wolter, A.; Celotti, A.
We construct the first X-ray selected sample of broad line radio-loud AGN from the EMSS survey. In order to test unifying schemes for radio-loud objects, their spectral and statistical properties (both flat and steep spectrum objects) are examined and compared with those of other samples of blazars. The X-ray selection allows us to explore propert…
H2, HD, and CO at the edge of 30 Dor in the LMC: The line of sight to Sk-69 246
de Boer, K. S.; Bluhm, H.
FUSE and IUE observations of
XMM-Newton EPIC observation of SMC SNR 0102-72.3 EPIC Observation of SMC SNR 0102-72.3
Haberl, F.; Filipović, M. D.; Sasaki, M. +2 more
Results from observations of the young oxygen-rich supernova remnant
UV spectra of T Tauri stars from the HST and IUE satellites: BP Tau
Vittone, A. A.; Errico, L.; Lamzin, S. A.
Ultraviolet spectra of BP Tau observed with HST/GHRS and IUE satellites were analysed. We found that BP Tau activity can be explained in the frame of a disk accretion model if we assume that the stellar magnetic axis is strongly inclined to the disk plane. The following set of accretion process parameters were derived: relative surface area of the…
Molecular gas and dust in NGC 4550. A galaxy with two counterrotating stellar disks
Henkel, C.; Wiklind, T.
We report the detection of 1 x 107 Msun of molecular gas in the central region of the S0/E7 galaxy NGC 4550, inferred from observations of CO(1-0) emission. Dust is detected in HST WFPC2 images and found to be asymmetrically distributed around the nucleus, only extending to a galactocentric distance of 7'' (600 pc). The shape…
Is SBS 0335-052 a young galaxy?
Östlin, G.; Kunth, D.
The metal-poor blue compact galaxy SBS 0335-052 has been put forward as a local primeval galaxy candidate, with a proposed age less than 108 years. If true, this would imply that galaxy formation was not confined to high red-shifts, but is still occurring in the local Universe, albeit at a slower rate. In this paper we show that some of…
Speckle observations of binary systems measured by Hipparcos
Lampens, P.; Prieur, J. -L.; Aristidi, E. +4 more
From speckle observations made with the PISCO speckle camera at the Pic du Midi Observatory, we present high angular resolution astrometric data for 43 binary stars already observed by the Hipparcos satellite. This sample consists of mainly new Hipparcos eclipsing binaries with a visual companion closer than one arcsecond, chosen with the aim to s…
The proper motions of fundamental stars. I. 1535 stars from the Basic FK5
Gontcharov, G. A.; Andronova, A. A.; Titov, O. A. +1 more
A direct combination of the positions given in the HIPPARCOS catalogue with astrometric ground-based catalogues having epochs later than 1939 allows us to obtain new proper motions for the 1535 stars of the Basic FK5. The results are presented as the catalogue Proper Motions of Fundamental Stars (PMFS), Part I. The median precision of the proper m…
The electron temperature of the inner halo of the Planetary Nebula NGC 6543
Hyung, S.; Kim, H.; Mellema, G. +1 more
We investigate the electron temperature of the inner halo and nebular core regions of
Optical variability of the B-type star HD 105382: Pulsation or rotation?
Aerts, C.; Briquet, M.; De Cat, P.
We present ground-based multi-colour Geneva photometry and high-resolution high S/N spectra of the variable B-type star HD 105382. We provide evidence that this star is not a Be star, as indicated in the literature. The monoperiodic variability found in the Hipparcos data is confirmed in our ground-based follow-up observations. All existing data g…