Search Publications
Physical properties of the pulsating hydrogen-deficient star LSS 3184 (BX Cir )
Jeffery, C. S.; Woolf, V. M.
We report new determinations of the radius and mass of the pulsating helium-rich, hydrogen-deficient star
Comparative abundance analysis of the hot main sequence stars and their progeny in open cluster M 25
Korotin, S. A.; Andrievsky, S. M.; Kovtyukh, V. V. +2 more
Remarkable inconsistencies between elemental abundances in the main sequence stars and their progeny F-G supergiants are discussed. Comparative abundance analysis of the hot main sequence stars, the cepheid U Sgr and two cool supergiants belonging to young open cluster M 25 is performed. The detected disaccord in the abundances of carbon, oxygen a…
Lensing properties of 7 damped Lyalpha absorbing galaxy-QSO pairs
Surdej, J.; Smette, A.; Le Brun, V. +1 more
Le Brun et al. (1997) presented the first identifications of the galaxies giving rise to 7 intermediate redshift damped Lyalpha (DLA) absorption systems. Here, we study the gravitational lensing properties of these foreground galaxies based on their observed optical appearance and on the absence of any secondary lensed quasar image. We consider th…
Eclipse mapping of the accretion stream in UZ Fornacis
Gänsicke, B. T.; Beuermann, K.; Kube, J.
We present a new method to map the surface brightness of the accretion streams in
Photometric and spectroscopic studies of cool stars discovered in EXOSAT X-ray images. IV. The northern hemisphere sample
Tagliaferri, G.; de Medeiros, J. R.; Messina, S. +4 more
We present high-precision photometry, high- and medium-resolution spectroscopy for a sample of 32 stars likely to be the optical counterparts of X-ray sources serendipitously detected by the EXOSAT satellite. Using also recent results from the Hipparcos satellite, we infer spectral types, compute X-ray luminosities and Li abundances and investigat…
The protostellar system HH108MMS
Siebenmorgen, R.; Krügel, E.
We probe the region around the protostar HH108MMS by deep mid infrared photometric and polarimetric imaging. The protostar is detected at 14mu m in absorption against the diffuse background. Next to HH108MMS, we find a second absorbing core, named Q1, and the young stellar object IRAS18331-0035 which is more advanced in its evolution and already s…
The active binary star II Pegasi with it BeppoSAX
Covino, S.; Tagliaferri, G.; Mewe, R. +2 more
CLASS B0827+525: `Dark lens' or binary radio-loud quasar?
Pearson, T. J.; Blandford, R. D.; Hoekstra, H. +12 more
We present radio, optical, near-infrared and spectroscopic observations of the source B0827+525. We consider this source as the best candidate from the Cosmic Lens All-Sky Survey (CLASS) for a `dark-lens' system or binary radio-loud quasar. The system consists of two radio components with somewhat different spectral indices, separated by 2.815 arc…
The search for YSOs from ISOGAL data. Application to the l = +45 field
Felli, M.; Omont, A.; Testi, L. +2 more
The 7 and 15 mu m observations of the Galaxy obtained by the ISOGAL program offer an unique possibility to investigate and separate the different populations of stars in the Galactic Plane, in particular to study the population of low flux density YSOs which could not be detected with IRAS. Considering the results obtained by ISOCAM in nearby star…
ISO detection of a 60 mu m source near GRB 970508
Altieri, B.; Piro, L.; Palazzi, E. +18 more
The Infrared Space Observatory observed the field of the gamma -ray burst GRB 970508 with the CAM and PHT instruments on May 21 and 24, 1997 and with PHT in three filters in November 1997. A source at 60 mu m (flux in May of 66+/- 10 mJy) was detected near the position of the host galaxy of this gamma -ray burst. The source was detected again in N…