Science Archives Publication System

ISO LWS Observations of Mars—Detection of Rotational Modulation in the Far Infrared

DOI: 10.1006/icar.2000.6436 Bibcode: 2000Icar..147...35S

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…

2000 • Icarus

ISO 10

On the processing and transport of inner source hydrogen

DOI: 10.1029/1999JA000226 Bibcode: 2000JGR...105.7473S

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…

2000 • Journal of Geophysical Research

Ulysses 10

VLA, SOHO and TRACE Observations of Nonthermal Burst Activity, Coronal Mass Ejections, and EUV Transient Events

DOI: 10.1023/A:1026530627523 Bibcode: 2000SoPh..197..399W

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…

2000 • Solar Physics

SOHO 10

The Hipparcos, Tycho, TRC, and ACT catalogues --- A whole sky comparison of the proper motions

Bibcode: 2000A&A...360..391H

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…

2000 • Astronomy and Astrophysics

Hipparcos 10

On the Electron Temperatures, Densities and Hot Ions in Coronal Hole Plasma Observed by Sumer on SOHO

DOI: 10.1016/S0273-1177(99)00586-4 Bibcode: 2000AdSpR..25.1751D

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…

2000 • Advances in Space Research

SOHO 10

CCD measurements of visual double stars made with the 50 cm refractor of the Nice Observatory (2^nd series)

DOI: 10.1051/aas:2000231 Bibcode: 2000A&AS..145...67M

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…

2000 • Astronomy and Astrophysics Supplement Series

Hipparcos 10

Adaptive Optics Observations of Saturn's Ring Plane Crossing in August 1995

DOI: 10.1006/icar.1999.6251 Bibcode: 2000Icar..143..299R

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…

2000 • Icarus

eHST 10

The nature of the DAB white dwarf HS 0209+0832

Bibcode: 2000A&A...361..629W

Reimers, D.; Wolff, B.; Jordan, S. +1 more

The DAB white dwarf HS 0209+0832 is one of the few white dwarfs with detected helium in the DB gap between 28 000 and 45 000 K. We have obtained ultraviolet and optical spectra with the Hubble Space Telescope (HST). The analysis results in an effective temperature of about 35 000 K and a helium abundance of about 1%. The presenc…

2000 • Astronomy and Astrophysics

eHST 10

Fourier Analysis of Hipparcos Photometry of Cepheid Variables

Bibcode: 2000AcA....50..387Z

Moskalik, P.; Ogloza, W.; Zakrzewski, B.

Fourier parameters have been computed for 240 field Cepheids observed by the Hipparcos satellite. We have identified three new PopulationI overtone Cepheids: V411Lac, V898 Cen and V572 Aql. We have compared Fourier progressions of Population I and Population II Cepheids. The possibility of using Fourier parameters to distinguish between the two ty…

2000 • Acta Astronomica

Hipparcos 10

The nearby M-dwarf system Gliese 866 revisited

DOI: 10.48550/arXiv.astro-ph/9910411 Bibcode: 2000A&A...353..253W

Franz, O. G.; Leinert, Ch.; Jahreiß, H. +3 more

We present an improved orbit determination for the visual pair in the M-dwarf triple system Gliese 866 that is based on new speckle-interferometric and HST observations. The system mass is M = 0.34+/- 0.03 M_sun. The masses of the components derived using the mass-luminosity relation are consistent with this mass sum. …

2000 • Astronomy and Astrophysics

eHST 10