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Thermal coupling of protons and neutral hydrogen in the fast solar wind
Habbal, Shadia R.; Allen, Lorraine A.; Hu, You Q.
We investigate the coupling between neutral hydrogen atoms and protons in the corona for a range of proton temperatures reaching a maximum of 6×106K, as recently inferred from observations of the Ly α spectral line profiles by Kohl et al. [1996]. We adopt the approach used by Olsen et al. [1994], whereby the neutral hydrogen atoms are t…
First Measurement of the Submillimeter Sunyaev-Zeldovich Effect
Bock, J. J.; Giard, M.; Pajot, F. +10 more
We report the first detection of the Sunyaev-Zeldovich (S-Z) increment on the cosmic microwave background at submillimeter wavelengths in the direction of a cluster of galaxies. It was achieved toward the rich cluster Abell 2163, using the PRONAOS 2 m stratospheric telescope. Together with data from the SuZIE, Diabolo, and ISO-PHT experiments, the…
Kinetic properties of solar wind minor ions and protons measured with SOHO/CELIAS
Wurz, P.; Bochsler, P.; Geiss, J. +14 more
Using observations of the Charge Time-of-Flight (CTOF) charge and mass spectrometer of the Charge, Element and Isotope Analysis System (CELIAS), and of CELIAS/proton monitor on board the Solar and Heliospheric Observatory (SOHO), we present an overview of speeds and kinetic temperatures of minor ions and protons in the solar wind near solar minimu…
The Very Highly Ionized Broad Absorption Line System of the QSO SBS 1542+541
Green, Richard F.; Kriss, Gerard A.; Zheng, Wei +2 more
We have analyzed the broad absorption line system of the bright (V ~ 16.5) high-redshift (z = 2.361) QSO SBS 1542+541 using UV spectra from the Hubble Space Telescope Faint Object Spectrograph, along with optical data from the Multiple Mirror Telescope and the Steward Observatory 2.3 m telescope. These spectra offer continuous wavelength coverage …
Hubble Space Telescope Imaging of the Optical Transient Associated with GRB 970508
Piro, L.; Pian, E.; Palazzi, E. +15 more
We report on Hubble Space Telescope observations of the optical transient (OT) discovered in the error box of the gamma-ray burst GRB 970508. The object was imaged on 1997 June 2 with the Space Telescope Imaging Spectrograph and Near-Infrared Camera and Multiobject Spectrometer. The observations reveal a pointlike source with R = 23.1+/-0.2 and H …
Structure, Excitation, and Kinematics of the Luminous Herbig-Haro Objects 80/81
Raga, A. C.; Reipurth, Bo; Heathcote, Steve
We present a detailed study of the Herbig-Haro objects HH 80/81, twin working surfaces in the highly collimated outflow driven by a luminous young star. High angular resolution emission line images obtained with the Hubble Space Telescope are used together with ground-based low- and high-dispersion spectroscopy, and proper motion measurements to p…
Is There a Deficit of S0 Galaxies at Intermediate Redshift?
Andreon, S.
Two contradictory results on the evolution of SO galaxies now exist in the recent literature: either S0's are old (zformation > 2) and are evolving passively or most of them form at z < 0.5, as implied by the deficit of S0's in intermediate-redshift (z ~ 0.5) clusters. The resolution of this controversy may be that the apparent de…
HIPPARCOS results on massive X-ray binaries
Chevalier, Claude; Ilovaisky, Sergio A.
We present results on parallaxes, magnitudes and proper motions for 17 optically identified massive X-ray binaries (MXRB) which were observed during the Hipparcos astrometry mission. This sample includes the sources detected in the medium-energy range (2-10 keV) having optical counterparts brighter than V=12. We compare the Hipparcos results with …
The gas/solid methane abundance ratio toward deeply embedded protostars
van Dishoeck, E. F.; Whittet, D. C. B.; Schutte, W. A. +3 more
We present the detection of ro-vibrational absorption lines of the deformation mode of gaseous CH_4 toward the massive protostars W 33A, and NGC 7538 : IRS9, using the SWS spectrometer on board of the Infrared Space Observatory. The observed lines indicate that the CH_4 gas is warm (T ~ 90 K), and has a low abundance ( ~ 4 10(-7) ). The CH_4 ice i…
Full Adaptive Optics Images of Asteroids Ceres and Vesta; Rotational Poles and Triaxial Ellipsoid Dimensions
Drummond, Jack D.; Fugate, Robert Q.; Christou, Julian C. +1 more
Adaptive optics (AO) images of asteroids Ceres and Vesta were obtained on September 18-20, 1993, with the 1.5-m telescope at the Starfire Optical Range of the USAF Phillips Laboratory located near Albuquerque, NM. The light source for higher-order wavefront correction was a Rayleigh laser beacon focused at a range of 10.5 km generated by a copper …