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The first brown dwarf with a disk in Chamaeleon II
Alcalá, J. M.; Frasca, A.; Merín, B. +4 more
In this letter we characterize the candidates for young stars and brown dwarfs detected in a survey with ISOCAM in the Chamaeleon II dark cloud. Photometric data coming from a wide-field optical imaging survey, combined with IR measurements from the 2MASS catalogue and from the Spitzer satellite, allow us to study the nature of the candidates. Usi…
The properties of the circumnuclear regions in the Circinus galaxy
Bianchi, S.; Matt, G.; Nicastro, F. +2 more
We analysed the spectra from the XMM-Newton and the three longest Chandra observations of the Circinus Galaxy, the X-ray brightest, Compton-thick Seyfert 2 galaxy, to derive the physical and morphological parameters of the circumnuclear matter. We compare the line and continuum parameters with extensive calculations performed with the well-known p…
The CdC2000 Bordeaux Carte du Ciel catalogue (+11° ≤ δ ≤ +18°)
Ducourant, C.; Soubiran, C.; Teixeira, R. +9 more
Context: .This work is part of a program of proper motion measurements in the Bordeaux Carte du Ciel zone.Aims.We present the CdC2000 catalogue issued from the reduction of the complete Bordeaux Carte du Ciel zone observed at the begining of last century with the Bordeaux astrograph.Methods.Plates have been individually reduced using the TYCHO-2 C…
Optical identification of IGR J19140+0951
O'Brien, K.; in't Zand, J. J. M.; Nelemans, G. +2 more
IGR J19140+0951 was discovered by INTEGRAL in 2003 in the 4-100 keV band. Observations with INTEGRAL and RXTE provide a tentative identification as a high-mass X-ray binary (HMXB) with a neutron star as accretor. However, an optical counterpart was thus far not established, nor was the presence of a pulsar which is commonly observed in HMXBs. We o…
Searching for X-ray luminous "normal" galaxies in 2dFGRS
Georgakakis, A.; Georgantopoulos, I.; Tzanavaris, P.
Aims.We cross-correlated the Chandra XASSIST and XMM-Newton Serendipitous Source Catalogues with the 2 degree Field Galaxy Redshift Survey (2dFGRS) database. Our aim was to identify the most X-ray luminous (LX > 1042 erg s-1) examples of galaxies in the local Universe whose X-ray emission is dominated by stellar…
Star formation in the Cepheus Flare region: implications from morphology and infrared properties of optically selected clouds
Krause, O.; Kun, M.; Stickel, M. +2 more
Aims.A complex study of visual and infrared properties of ISM and an examination of cloud morphology was carried out using USNO, 2MASS, DIRBE, IRAS, and ISO data of an extended region in Cepheus to explore the conditions of cloud and star formation.
Methods: .We mapped the distribution of visual extinction in a 256 square degree area of Cepheu…
Surface photometry and structure of high redshift disk galaxies in the HDF-S NICMOS field
Tamm, A.; Tenjes, P.
Aims.We report on a photometric study of a sample of 22 disk galaxies in the Hubble Deep Field South NICMOS parallel field. The redshift range of the galaxies is z=0.5{-}2.6.Methods.We use deep NICMOS J and H band and STIS open mode images, taken as part of the HDF-S project, to construct rest-frame B-profiles and (U-V) color profiles of the galax…
First Doppler images of the very young K2-dwarf PW Andromedae = HD 1405
Strassmeier, K. G.; Rice, J. B.
Aims.We present the first Doppler images of the single pre-main-sequence star PW And. Its position in the HR-diagram suggests it to be in the rapid-braking phase just prior to arrival on the ZAMS.
Methods: .Images are obtained from seven individual spectral lines as well as from 5-nm wide chunks of spectrum that invert a total of 58 line profi…
The UV spectrum of HS 1700+6416. I. Predicting the metal line content of the far UV spectrum
Reimers, D.; Sargent, W. L. W.; Fechner, C. +3 more
Aims.In preparation of a study of the He II/H I ratio towards the bright QSO
Methods: .For that purpose, we investigate the s…
Non-gravitational motion of the Jupiter-family comet 81P/Wild 2. I. The dynamical evolution
Szutowicz, S.; Królikowska, M.
We investigated the influence of the non-gravitational effects on the orbital motion of 81P/Wild 2. First, the non-gravitational accelerations on cometary nucleus throughout all five revolutions around the sun were analysed using both the symmetrical and the asymmetrical g(r)-function. Next, the symmetric model was used to examine the past and fut…