Search Publications
High-resolution far ultraviolet spectrum of electron-excited SO2
Ajello, Joseph; Bhardwaj, Anil; Vatti Palle, Prahlad
The high-resolution UV capabilities (λ/Δλ = 105) of the Hubble Space Telescope (HST) equipped with the Space Telescope Imaging Spectrograph (STIS) reflects a need for a high-resolution laboratory UV spectral data base for comparison with observation. For the purpose of interpreting the astronomical observations of Io by HST the electron…
Estimating stellar parameters from spectra. I. Goodness-of-fit parameters and lack-of-fit test
Aerts, C.; Decin, L.; Molenberghs, G. +2 more
Estimating stellar parameters from spectrophotometric data is a key tool in the study of stellar structure and stellar evolution. Although many methods have been proposed to estimate stellar parameters from ultraviolet (UV), optical and infrared (IR) data using low, medium or high-resolution observational data of the target(s), only a few address …
XMM-Newton observations of the Vela pulsar
Zane, S.; Hailey, C. J.; Mori, K. +1 more
We present spectral analysis from XMM-Newton observations of the Vela pulsar. We analyzed thermal emission from the pulsar dominating below ~1 keV since extracted spectra are heavily contaminated by nebular emission at higher energy. Featureless high-resolution spectra of the reflection grating spectrometer aboard XMM-Newton suggest the presence o…
Preliminary Orbits for Eight Visual Binaries
Ling, J. F.
This paper reports orbits and masses calculated for the visual binary stars WDS 00427-6537 (I440), WDS 01084-5515 (RST 1205 AB), WDS 01343-0827 (A314), WDS 03590+0947 (HU 27), WDS 10287+4558 (A1993), WDS 12429+0516 (A1602), WDS 20157+4339 (A2095 AB), and WDS 22180-6249 (I20). All the orbits have previously been announced in IAU Commission 26 Infor…
Proper motions of open star clusters from Tycho-2 catalogue data
Beshenov, G. V.; Loktin, A. V.
The results of determinating the proper motions of open clusters on the basis of the Tycho-2 catalogue data are presented here. The resulting catalogue contains mean proper motions for 390 open clusters.
Investigation of the source region of ionospheric oxygen outflow in the cleft/cusp using multi-spacecraft observations by CIS onboard Cluster
Lundin, R.; Dandouras, I.; Klecker, B. +18 more
Beams of singly ionized oxygen with narrow energy distributions originating in the dayside cleft/cusp region are frequently observed in the cleft, cusp and polar cap regions by the CODIF sensor of the CIS instrument onboard Cluster. During summer and fall of 2001, the high separation distances of ∼1 Re between the spacecraft provided a good opport…
Doppler Tomography of X-ray binaries
Boroson, B.; Vrtílek, S. D.; Quaintrell, H. +1 more
The Space Telescope Imaging Spectrograph (STIS) on HST provides the first ultraviolet data that are of sufficient spectral and temporal resolution to generate Doppler tomograms of X-ray binaries. We show both optical and ultraviolet maps constructed for the intermediate mass system Hercules X-1/HZ Her and the massive wind-fed system SMC X-1/SK160.…
The stellar content of the ring in NGC 660
Tikhonov, N. A.; Galazutdinova, O. A.; Hagen-Thorn, V. A. +2 more
We present the results of stellar photometry of the polar-ring galaxy
ISOCAM Observations of Globular Clusters in the Magellanic Clouds: The Data
Sauvage, M.; Onaka, T.; Tanabé, T. +2 more
Seventeen globular clusters in the Large and Small Magellanic Clouds were observed in the mid-infrared wavelength region with the ISOCAM instrument on board the Infrared Space Observatory (ISO). Observations were made using the broadband filters LW1, LW2, and LW10, corresponding to the effective wavelengths of 4.5, 6.7, and 12 µm, respective…
The corona of HD 199178 (V 1794 Cygni)
Gondoin, P.
HD 199178 (V 1794 Cygni), a chromospherically active late-type giant with a high X-ray luminosity, was observed by the XMM-Newton space observatory. Series of lines of highly ionized Fe and several Lyman lines of hydrogen-like ions are visible in the reflection grating spectra, most notably from O and Ne. Analysis results suggest a scenario where …