Search Publications
Reprocessing the Hipparcos data for evolved giant stars II. Absolute magnitudes for the R-type carbon stars
Jorissen, A.; Pourbaix, D.; Knapp, G.
The Hipparcos Intermediate Astrometric Data for carbon stars have been reprocessed using an algorithm which provides an objective criterion for rejecting anomalous data points and constrains the parallax to be positive. New parallax solutions have been derived for 317 cool carbon stars, mostly of types R and N. In this paper we discuss the results…
Infrared spectrum and proper motion of the brown dwarf companion of HR 7329 in Tucanae
Neuhäuser, R.; Guenther, E. W.; Huélamo, N. +2 more
Up to now only four brown dwarf companions to normal stars have been found and confirmed by both spectroscopy and proper motion (namely
Broadband infrared photometry of comet Hale-Bopp with ISOPHOT
Krüger, H.; Lamy, P.; Keller, H. U. +21 more
Comet Hale-Bopp was observed five times with ISOPHOT, the photometer on board ESA's Infrared Space Observatory (ISO) between 4.6 and 2.8 AU. Each time, broadband photometry was performed using 4 different detectors, 5 apertures and 10 filters covering the range between 3.6 and 170 mu m. Background observations were performed with identical instrum…
Water in K and M giant stars unveiled by ISO
Tsuji, T.
Based on the spectra obtained with Infrared Space Observatory, ISO, we detected the 6.3 mu m bands of water in the late K giant Aldebaran (alpha Tau) and several early M giant stars (between M0 and M3.5), which have been deemed to be too warm for tri-atomic H2O molecule to reside in their photospheres. The water column densities range (…
Bands of solid CO2 in the 2-3 mu m spectrum of S 140:IRS1
Schutte, W. A.; Tielens, A. G. G. M.; Boogert, A. C. A. +2 more
We investigate the 2-3 µm ISO-SWS spectrum of the luminous protostellar object S 140:IRS1. Two narrow absorption features are detected at 2.70 and 2.77 mu m, which are well fitted with laboratory spectra of the nu1 + nu3 and the 2nu2 + nu3 combination modes of solid CO2. The ice in this …
A spectroscopic survey for lambda Bootis stars. III. Final results
Paunzen, E.
In the third paper of a series dedicated to the spectroscopic survey for new lambda Bootis stars, we present all new and confirmed members of the group as well as a detailed analysis of the observed sample. The nature of this small group of chemically peculiar stars of the upper main sequence still challenges our understanding of processes like di…
VLBI, MERLIN and HST observations of the giant radio galaxy 3C 236
Dallacasa, D.; Gurvits, L. I.; Miley, G. K. +6 more
We present VLBI and MERLIN data at 1.66 and 4.99 GHz on the central component coincident with the nucleus of the giant radio galaxy, 3C 236. The nuclear radio structure is composed of two complexes of emission which are resolved on scales from 1 milli-arcsec (mas) to 1 arcsec. Oscillations with an amplitude of ~ 5degr can be seen in the compact ra…
The extended X-ray halo of the Crab-like SNR G21.5-0.9
Haberl, F.; Bernard, J. -P.; Read, A. M. +12 more
Recent XMM-Newton observations reveal an extended (r ~ 150'') low-surface brightness X-ray halo in the supernova remnant G21.5-0.9. The near circular symmetry, the lack of any limb brightening and the non-thermal spectral form, all favour an interpretation of this outer halo as an extension of the central synchrotron nebula rather than as a shell …
Monitoring of the optical and 2.5-11.7 mu m spectrum and mid-IR imaging of the Seyfert 1 galaxy Mrk 279 with ISO
Altieri, B.; Malkan, M. A.; Clavel, J. +29 more
Mid-infrared images of the Seyfert 1 galaxy
HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4
Zoccali, M.; Rich, R. M.; Bica, E. +4 more
We present results from NICMOS Hubble Space Telescope observations of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4, obtained through the filters F110W (1.1 mu m) and F160W (1.6 mu m) (nearly equivalent to J and H). For the first time the turnoff region of Liller 1 and the main sequence of Terzan 5 and Terza…