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HST/STIS spectroscopy of the exposed white dwarf in the short-period dwarf nova EK TrA
Gänsicke, B. T.; Szkody, P.; Hoard, D. W. +4 more
We present high resolution Hubble Space Telescope ultraviolet spectroscopy of the dwarf nova EK TrA obtained in deep quiescence. The Space Telescope Imaging Spectrograph data reveal the broad Lyalpha absorption profile typical of a moderately cool white dwarf, overlayed by numerous broad emission lines of He, C, N, and Si and by a number of narrow…
A Comparison between PAα and Hα Emission: The Relation between Mean H II Region Reddening, Local Gas Density, and Metallicity
Quillen, Alice C.; Yukita, Mihoko
We measure reddenings to H II regions in NGC 1512, 2903, 4449, and 6946, and M51 from Hubble Space Telescope (HST) Paα and Hα images. Extinctions range from AV~5 to 0 depending upon the galaxy. For the galaxies with HST images in both lines, NGC 1512, NGC 2903, and M51, the Paα and Hα emission are almost identical in morphology, which i…
FIRBACK. II. Data reduction and calibration of the 170 µ m ISO deep cosmological survey
Dole, H.; Lagache, G.
We present the final reduction and calibration of the FIRBACK ISOPHOT data. FIRBACK is a deep cosmological survey performed at 170 mu m. This paper deals with the ISOPHOT C200 camera with the C160 filter. We review the whole data reduction process and compare our final calibration with DIRBE (for the extended emission) and IRAS (for point sources)…
Intercalibration of SUMER and CDS on SOHO. II. SUMER detectors A and B and CDS NIS
Solanki, Sami K.; Wilhelm, Klaus; Schühle, Udo +5 more
Results of an intercalibration between the extreme-ultraviolet spectrometers Coronal Diagnostic Spectrometer (CDS) and Solar Ultraviolet Measurements of Emitted Radiation (SUMER) on board the Solar and Heliospheric Observatory (SOHO) are reported. The results of the joint observing program Intercal_01 are described, and intercalibration results up…
HST/STIS observations of the high-velocity interstellar cloud HVC 291.2-41.2+80: a warm, mainly ionized high-velocity cloud
Sembach, K. R.; Keenan, F. P.; Lehner, N.
We present intermediate-resolution HST/STIS spectra of a high-velocity interstellar cloud (vLSR=+80kms-1) towards DI1388, a young star in the Magellanic Bridge located between the Small and Large Magellanic Clouds. The STIS data have a signal-to-noise ratio (S/N) of 20-45 and a spectral resolution of about 6.5kms-1…
Photometric properties of the Arp 220 super star clusters
Taniguchi, Yoshiaki; Shioya, Yasuhiro; Trentham, Neil
We investigate the photometric properties of six super stellar clusters (SSCs) seen in both the optical and near-infrared Hubble Space Telescope images of the local ultraluminous starburst galaxy Arp 220. Three of the SSCs are located in the central 0.5-kpc region. The remaining three are in the circumnuclear region between 0.5 and 2.5kpc from the…
Exploration of the BaSeL stellar library for 9 F-type stars COROT potential targets. Comparisons of fundamental stellar parameter determinations
Cuisinier, F.; Lignières, F.; Buser, R. +4 more
The Basel Stellar Library (BaSeL models) is constituted of the merging of various synthetic stellar spectra libraries, with the purpose of giving the most comprehensive coverage of stellar parameters. It has been corrected for systematic deviations detected in respect to UBVRIJHKLM photometry at solar metallicity, and can then be considered as the…
LB 8827: A Variable, Magnetic DBA White Dwarf
Fontaine, G.; Bergeron, P.; Wesemael, F. +3 more
We present accurate CCD spectropolarimetry and spectra that show that the hot DB star LB 8827 (PG 0853+164) is a weakly magnetic, variable DBA white dwarf. We confirm Putney's detection of circular dichroism in the He I lines, but on three occasions we measure a weaker field strength and opposite sign of circular polarization, Be<~10…
Electron Densities, Radial and Terminal Wind Velocities for the Planetary Nebula NGC 6302 and Its O VI-Type Binary Nucleus
Feibelman, Walter A.
Archival high- and low-dispersion IUE spectra of NGC 6302 and its nucleus have been analyzed. The spectra in the NEWSIPS format reveal many high-excitation emission features, including stellar O V, O VI, O VII, and O VIII that identify the nucleus as a new member of the ``O VI sequence.'' Fe II features that are resonantly excited by O VI λ1032 ar…
Cluster observes the Earth's magnetopause: coordinated four-point magnetic field measurements
Balogh, A.; Dunlop, M. W.; Cargill, P. +5 more
The four-spacecraft Cluster mission has provided high-time resolution measurements of the magnetic field from closely maintained separation distances (200-600 km). Four-point coverage of the Earth's magnetopause began on the 9 and 10 November 2000 when all spacecraft first exited the dusk-side magnetosphere at about 19:00 LT, providing extensive c…