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Cassini radio detection and ranging (RADAR): Earth and venus observations
Lorenz, R. D.; West, R. D.; Janssen, M. A. +11 more
The Cassini Radio Detection and Ranging (RADAR) was operated in scatterometric and radiometric modes during the Venus 1 and Earth swingbys to verify its functionality. At Venus, only the thermal emission from the thick absorbing atmosphere was detected. At Earth both the radar echo and the microwave emission from the surface were detected and reve…
Contribution of the Solar Constant (SOLCON) program to the long-term total solar irradiance observations
Dewitte, S.; Helizon, R.; Wilson, R. S.
On long timescales the variation of the total solar irradiance (TSI) received by the Earth is believed to be one of the climate change drivers. Therefore accurate and time-stable measurements of the total solar irradiance are necessary. The Solar Constant (SOLCON) instrument made TSI measurements in April 1992 and during the International Extreme …
Hipparcos and MAP Studies of the Triple Star π Cephei
Han, Inwoo; Gatewood, George; Pourbaix, Dimitri +2 more
We reexamine the visual and radial velocity data for the π Cephei triple star system and derive the masses of the three components. Our study is based upon the analysis of Hipparcos Intermediate Astrometric Data (IAD) measurements obtained with the red light Thaw refractor's Multichannel Astrometric Photometer (Thaw/MAP) and positions obtained fro…
Search for the [C{{II}}] 158 micron emission toward the blue compact dwarf galaxy I Zw 36
Onaka, T.; Mochizuki, K.
We observed the blue compact dwarf galaxy I Zw 36 in the [C Ii] 158 mu m line with the Infrared Space Observatory obtaining an upper limit for the line flux, F_[ion {C{ii}]} <= 1.1 10-20 W cm-2 (3 sigma ). A comparison with previous CO observations yields an upper limit for the [C Ii]/CO J = 1-0 line flux ratio, F_[ion {C{…
ISO continuum observations of quasars at z=1-4. I. Spectral energy distributions of quasars from the UV to far-infrared
Kawara, K.; Taniguchi, Y.; Oyabu, S. +8 more
Eight luminous quasars with -30 < MB < -27 at z = 1.4-3.7 have been observed in the mid- and far-infrared using ISO. All the quasars have been detected in the mid-infrared bands of ISOCAM, while no far-infrared detections have been made with ISOPHOT. SEDs (Spectral Energy Distributions) from the UV to far-infrared have been obtain…
The Fossil Starburst in M82
O'Connell, Robert W.; Gallagher, John S., III; De Grijs, Richard
We present high-resolution optical and near-infrared HST observations of two adjacent regions in the fossil starburst region inM82, M82 B1 and B2. The presence of both the active and the fossil starburst in M82 provides a unique physical environment to study the stellar and dynamical evolution of star cluster systems. The cluster population in B2 …
Hubble Space Telescope Color-Magnitude Data for Globular Clusters. I. Transformations between STIS LP Magnitudes and WFPC2 F606W and F814W Magnitudes
Wyse, Rosemary F. G.; Gilmore, Gerard; Houdashelt, Mark L.
We present deep Hubble Space Telescope optical imaging observations of two Galactic globular clusters, 47 Tucanae and M15, using the Space Telescope Imaging Spectrograph (STIS) longpass (LP) filter and the Wide Field and Planetary Camera 2 (WFPC2) F606W and F814W filters. These globular clusters have very different metallicities ([Fe/H]~-0.7 dex f…
The brightness of SN 1991T and the uniformity of decline-rate and colour corrected absolute magnitudes of supernovae Ia
Tonry, J.; Richtler, T.; Jensen, J. B. +2 more
We present a distance to
X-type interactions of the loops in the flare of 25 September 1997 - Part II
Mandrini, C. H.; Siarkowski, M.; Falewicz, R. +1 more
The interaction of magnetic structures and the conversion of magnetic free energy into heating of the plasma and acceleration of particles are commonly accepted as the origin of solar flares. The 3-dimensional (3D) structure and evolution of the coronal magnetic field can be investigated indirectly by the analysis of the images of various loops fi…
The Accretion Disk and White Dwarf during the Quiescence of the Dwarf Novae VW Vulpeculae and χ Leonis
Sion, Edward M.; Henry, Colleen K.
We have carried out an International Ultraviolet Explorer archival comparative study of the two U Geminorum type dwarf novae VW Vulpeculae and χ Leonis. The spectrum of χ Leo does not show any C IV, a feature normally seen in the vast majority of other dwarf novae. For VW Vul, a single-temperature high-gravity photosphere does not produce a consis…