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Time-distance helioseismology
Kosovichev, A. G.; Scherrer, P. H.; Duvall, T. L.
The time-distance helioseismology (or helioseismic tomography) is a new promising method for probing 3-D structures and flows beneath the solar surface, which is potentially important for studying the birth of active regions in the sun's interior and for understanding the relation between the internal dynamics of active regions and chromospheric a…
Spectroscopic binary orbits from ultraviolet radial velocities. Paper 30: HD 164402
Stickland, D. J.; Lloyd, C.
Properties of Coronal Hole/Streamer Boundaries and Adjacent Regions as Observed by SPARTAN 201
Guhathakurta, M.; Strachan, L.; Kohl, J. L. +4 more
The Spartan 201 flights from 1993 to 1995 provided us with observations in H I Lyman-α of several coronal hole/streamer boundaries and adjacent streamers during the declining phase of the current solar cycle: Analysis of the latitudinal dependence of the line intensities clearly shows that there is a boundary region at the coronal hole/streamer in…
The peak flux distribution of bright gamma-ray bursts measured with ULYSSES
Hurley, K.; Atteia, J. -L.; Boër, M.
Observations of gamma-ray burst afterglows have shown that these events come from formidable explosions at cosmological distances. If the most distant GRBs seen by BATSE have redshifts of the order of 3-6 (e.g. GB 971214), it is a coincidence that the bright end of the GRB intensity distribution displays the -3/2 slope expected for a Euclidean dis…
Contribution à l'étude des spectres composites. VIII. HD 174016-7, une étoile Ap associée à une géante G Contribution to the study of composite spectra VIII. HD 174016-7, an Ap star with a giant G
Udry, S.; Griffin, R. F.; Ginestet, N. +1 more
HD 174016-7, listed by \cite[Hynek (1938)]{Hynek} as a star having a composite spectrum, was on our observing programmes of such objects carried out both at the Cambridge Observatories and at the Observatoire Midi-Pyrénées. Most of the observations were made with the CORAVEL spectrovelocimeter of the Swiss telescope at the Observatoire de Haute-Pr…
An INFRARED SPACE OBSERVATORY Upper Limit to the Low-Mass Star Halo in the Edge-on Galaxy NGC 4565
Helou, George; Beichman, Charles; Desert, F. X. +2 more
We present deep ISOCAM observations taken at 4.5 µm (LW1) in search of a faint halo surrounding the edge-on spiral galaxy NGC 4565. Such a halo might exist if the massive halo that is needed to explain the flat rotation curve of this galaxy were attributable to a population of faint, red objects. The upper limit, 5.4 kJy sr-1 (3 σ…
Spectroscopic Monitoring of the BE/X-Ray Pulsar X Persei-4U 0352+309 with the Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer SPAS II and the IUE
Smith, Myron A.; Roche, Paul
We present phase-resolved spectra of the Be/X-ray pulsar system X Persei/4U 0352+309 obtained with the Tübingen far-UV echelle spectrometer of the Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer SPAS II (ORFEUS-SPAS II). Data were obtained in 1996 November and folded on the ~837.5 s pulsar period derived from contemporaneous X-ra…
The proper and space motions of globular cluster NGC 4147 on Hipparcos system.
Wu, Zhenyu; Wang, Jiaji
The positions and proper motions of 82 stars in the field of the globular cluster NGC 4147, reduced with the 11 reference stars from the Hipparcos Catalogue, are kindly provided by M. Geffert, Bonn. 54 of these stars are used as reference stars to re-reduce the observations by Wang & Gupta (1998). Based on the new proper motions obtained from …
The Raman signature of H2 in the uv spectra of Uranus and Neptune: Constraints on the haze optical properties and on the para-H2 fraction
Courtin, Régis
The geometric albedos of Uranus and Neptune, inferred from archived Hubble Space Telescope observations and from the ground-based measurements of Karkoschka, 1994, are modeled in the wavelength range 2200-4200 Å. The radiative transfer model, which includes Rayleigh-Raman scattering and Mie scattering by haze particles, aims at reproducing the fin…
A survey of unresolved objects in the Hubble Deep Field South
Elson, Rebecca A. W.; Tanvir, Nial R.; Johnson, Rachel A. +1 more
We present a survey of unresolved objects in the Hubble Deep Field South. We find 39 such objects with V606>27.3. Of these, 29 are candidate main-sequence stars. Their number counts are consistent with no extended stellar halo around the Galaxy, in agreement with analyses of the Hubble Deep Field North. We identify 6 objects which ha…