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Latitudinal velocity structures up to the solar poles estimated from interplanetary scintillation tomography analysis
Tokumaru, M.; Kojima, M.; Fujiki, K. +3 more
The Ulysses spacecraft observed high-speed wind at high latitudes up to 80° and found that the high-speed solar wind increased in velocity gradually with latitude and that the velocity had asymmetry between Northern and Southern Hemispheres. We have investigated the velocity increase up to the polar regions for the Carrington rotations of 1908-191…
UBV Photometry of the Massive Eclipsing Binary TT Aur
Demircan, O.; Saygaç, A. T.; Özdemir, S. +5 more
UBV observations of the massive binary system TT Aur were carried out mainly at the Turkish National Observatory (TUG). These observations, together with IUE spectra and times of eclipse minima collected from the literature, were used to study the system parameters. Simultaneous solution of the light curves by the Wilson-Devinney code allows a sem…
Middle Ultraviolet Spectroscopy of Pluto and Charon
Krasnopolsky, Vladimir A.
The first Pluto's spectrum in the range 2000 to 2500 Å has been extracted from the Hubble Space Telescope (HST) archive observations acquired during 24 orbits. Although the spectral intensity is very weak and smaller than that for Titan by a factor of 100, the spectrum has a signal-to-noise ratio of 10-15 at the resolution of 10 Å. The mean geomet…
The electron temperature of the inner halo of the Planetary Nebula NGC 6543
Hyung, S.; Kim, H.; Mellema, G. +1 more
We investigate the electron temperature of the inner halo and nebular core regions of
Optical variability of the B-type star HD 105382: Pulsation or rotation?
Aerts, C.; Briquet, M.; De Cat, P.
We present ground-based multi-colour Geneva photometry and high-resolution high S/N spectra of the variable B-type star HD 105382. We provide evidence that this star is not a Be star, as indicated in the literature. The monoperiodic variability found in the Hipparcos data is confirmed in our ground-based follow-up observations. All existing data g…
Stellar Variability in the Metal-rich, Obscured Globular Cluster Terzan 5
Edmonds, Peter D.; Grindlay, Jonathan E.; Cohn, Haldan +1 more
We present the results of a search for variability in and near the core of the metal-rich, obscured globular cluster Terzan 5, using the near-infrared camera and multiobject spectrometer (NICMOS) on board the Hubble Space Telescope. This extreme cluster has approximately solar metallicity and a central density that places it in the upper few perce…
WFPC2 Imaging of Quasar Environments: A Comparison of Large Bright Quasar Survey and Hubble Space Telescope Archive Quasars
Hooper, Eric J.; Impey, Chris D.; Finn, Rose A.
We present Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) data on the large-scale environments of 16 0.39<z<0.51 quasars from the Large Bright Quasar Survey (LBQS). The LBQS quasars are representative of the radio-quiet population, and this is one of the first looks at their large-scale environments. We compare the LBQS e…
The electron pressure in the outer atmosphere of ɛ Eri (K2 V)
McMurry, A. D.; Jordan, C.; Sim, S. A. +1 more
Observations of ɛ Eri (K2 V) have been made with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. The spectra obtained show a number of emission lines which can be used to determine, or place limits on, the electron density and pressure. Values of the electron pressure are required in order to make quantitative models of the…
The Gravitational Lens Candidate FBQ 1633+3134
White, Richard L.; Gregg, Michael D.; Morgan, Nicholas D. +2 more
We present our ground-based optical imaging, spectral analysis, and high-resolution radio mapping of the gravitational lens candidate FBQ 1633+3134. This z=1.52, B=17.7 quasar appears double on CCD images with an image separation of 0.66" and a relatively constant flux ratio of ~3:1 across B, V, R, and I filters. A single 0.27 mJy radio source is …
The Extreme-Ultraviolet Structure and Properties of a Newly Emerged Active Region
Gallagher, Peter T.; Phillips, Kenneth J. H.; Lee, Jeongwoo +2 more
The structure and properties of a newly emerged solar active region (NOAA Active Region 7985) are discussed using the Coronal Diagnostic Spectrometer (CDS) and the Extreme-Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory. CDS obtained high-resolution EUV spectra in the 308-381 Å and 513-633 Å wavelength ranges, w…