Search Publications
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…
CCD astrometric observations of Phoebe in 2003-2004
Qiao, R. C.; Yu, Y.; Shen, K. X. +5 more
In 2003-2004, we obtained 115 new observations of Phoebe, the 9th Saturnian faint satellite (visual magnitude of about 16.5). We used a large CCD detector (2048×2048 pixels) mounted on the 1.56 m astrometric reflector at the Sheshan Station, near Shanghai. In our reduction, an up-to-date catalogue of stars, UCAC2 (Zacharias et al. 2004), was chose…
The ultra-compact binary 4U 1850-087 observed with INTEGRAL: hard X-ray emission from an X-ray burster
Mereghetti, S.; Sidoli, L.; Bazzano, A. +1 more
Context: .The X-ray burster 4U 1850-087, located in the Galactic globular cluster NGC 6712, is an ultracompact binary (orbital period ~21 min), likely harbouring a degenerate companion.
Aims: .The source has been observed at soft γ-rays several times with the INTEGRAL satellite, during the monitoring of the Galactic plane, with an unprecedente…
Slow halo CMEs with shock signatures
Pohjolainen, S.; Lehtinen, N. J.
Context: .In the solar corona, shocks are formed when the speed of a disturbance exceeds the local magnetosonic speed. In the active region corona the Alfvén speed can drop to a few hundred km s-1, but globally it is much higher. There has been a long debate on whether the shocks responsible for type II bursts are created by bow shocks …
GRB 030406 - an extremely hard burst outside of the INTEGRAL field of view
Goldoni, P.; Rau, A.; Bulik, T. +3 more
Using the IBIS Compton mode, the INTEGRAL satellite is able to detect and localize bright and hard GRBs, which happen outside of the nominal INTEGRAL field of view. We have developed a method of analyzing such INTEGRAL data to obtain the burst location and spectra. We present the results for the case of
Low mass pre-main sequence stars in the Large Magellanic Cloud
Panagia, N.; Romaniello, M.; Blanco, C. +2 more
As a part of an ongoing effort to characterise the young stellar populations in the Large Magellanic Cloud, we present HST-WFPC2 broad and narrow band imaging of two fields with recent star formation activity in the Tarantula region. A population of objects with Hα and/or Balmer continuum excess was identified. On account of the intense Hα emissio…