Search Publications
New infrared object in the field of the SMC cluster NGC 330
Sauvage, M.; Tanabé, T.; Vansevičius, V. +1 more
We report ISO (Infrared Space Observatory) observations of a new infrared source discovered in the vicinity of the young populous cluster NGC 330 in the Small Magellanic Cloud. The object was observed with ISOCAM at 4.5, 6.75 and 11.5 mu m and shows a prominent mid-infrared excess, indicating the presence of a dust shell. The available observation…
Unusual spectral energy distribution of a galaxy previously reported to be at redshift 6.68
Chen, Hsiao-Wen; Lanzetta, Kenneth M.; Pascarelle, Sebastian +1 more
Observations of distant galaxies are important both for understanding how galaxies form and for probing the physical conditions of the Universe at early times. It is, however, very difficult to identify galaxies at redshifts <italic>z</italic> > 5, because they are so faint and have few spectral characteristics. We previously report…
ISO LWS Observations of Mars—Detection of Rotational Modulation in the Far Infrared
de Graauw, Th.; Lellouch, E.; Burgdorf, M. +7 more
A series of far infrared (FIR) spectra of Mars between 43 and 196 µm was taken with the Long Wavelength Spectrometer (LWS) on board the European Space Agency's Infrared Space Observatory (ISO). Analysis of these medium-resolution data reveals a rotational modulation of the disk-averaged FIR brightness temperature. The observed variability of…
On the processing and transport of inner source hydrogen
Geiss, J.; Schwadron, N. A.
The inferred spatial distribution, inferred dust grain properties, and abundances of inner source pickup ions have been discussed recently by Gloeckler et al. [this issue] and Schwadron et al. [this issue]. The abundances of all observed inner source constituents, with the exception of protons, appear to be very similar to solar wind abundances. T…
VLA, SOHO and TRACE Observations of Nonthermal Burst Activity, Coronal Mass Ejections, and EUV Transient Events
Willson, Robert F.
Very Large Array (VLA) observations of the Sun at 91 and 400 cm wavelength have been used to investigate the radio signatures of EUV heating events and coronal mass ejections (CMEs) detected by SOHO and TRACE. Our 91 cm observations show the onset of Type I noise storm emission about an hour after an EUV ejection event was detected by EIT and TRAC…
The Hipparcos, Tycho, TRC, and ACT catalogues --- A whole sky comparison of the proper motions
Hoogerwerf, R.; Blaauw, A.
We present a whole sky comparison of the proper motions contained in the Hipparcos Catalogue, the Tycho Catalogue, the Tycho Reference Catalogue (TRC), and the Astrographic Catalogue plus Tycho Reference Catalogue (ACT). The catalogues are compared in the 20 declination zones defined by the original Carte du Ciel project. We find that (1) the prop…
On the Electron Temperatures, Densities and Hot Ions in Coronal Hole Plasma Observed by Sumer on SOHO
Dwivedi, B. N.; Mohan, A.; Wilhelm, K.
Making use of high-resolution ultraviolet observations obtained with SUMER (Solar Ultraviolet Measurements of Emitted Radiation) on the spacecraft SOHO (Solar and Heliospheric Observatory), we study plasma temperatures, densities and hot ions in polar coronal holes (source region of the high-speed solar wind). In particular, we present spectroscop…
CCD measurements of visual double stars made with the 50 cm refractor of the Nice Observatory (2nd series)
Gili, R.; Salaman, M.; Morlet, G.
We present the measurements of 65 visual double stars made in 1998 with the 50 cm refractor of the Nice Observatory (Table 1). A CCD camera was attached to this refractor. 6 new binaries discovered by Hipparcos have been measured. The algorithm used for these measurements is based on the adjustment of a tridimensional mathematical surface. Table 1…
Adaptive Optics Observations of Saturn's Ring Plane Crossing in August 1995
Owen, T.; Brahic, A.; Dumas, C. +4 more
Adaptive optics (0.15″ resolution) infrared images of the rings and satellites of Saturn were obtained in August 1995 as the Earth was crossing the ring plane. Twelve clumps were detected in the F ring, including HST S5 and S7 objects. For the first time H magnitudes were obtained for Prometheus, Pandora, Telesto, and Calypso, and J magnitudes for…
The nature of the DAB white dwarf HS 0209+0832
Reimers, D.; Wolff, B.; Jordan, S. +1 more
The DAB white dwarf