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Limits on the Boron Isotopic Ratio in HD 76932
Rebull, Luisa; Duncan, Douglas; Johansson, Sveneric +2 more
Data in the λ2090 B region of HD 76932 have been obtained at a high signal-to-noise ratio using the Hubble Space Telescope Goddard High-Resolution Spectrograph echelle at a resolution of 90,000. This wavelength region has been previously identified as a likely candidate for observing the 11B/10B isotopic splitting. The observ…
NGC 5252 - a Liner undercover
Goncalves, A. C.; Veron, P.; Veron-Cetty, M. -P.
Ground based long slit spectroscopic observations of the nuclear region of NGC 5252, and Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra of the nucleus and two bright knots located 0.36'' NE and 0.31'' SW from it, show that the nuclear region exhibits the characteristics of a Liner with exceptionally strong [O i] emission, all…
Far-Ultraviolet and Visible Imaging of the Nucleus of M32
Casertano, Stefano; Cole, Andrew A.; Ballester, Gilda E. +15 more
We have imaged the nucleus of M32 at 1600 Å (FUV) and 5500 Å (V) using the Wide-Field/Planetary Camera 2 (WFPC2) aboard the Hubble Space Telescope. We detected the nucleus at 1600 Å using the redleak-free Woods filter on WFPC2. The far-ultraviolet (FUV) light profile can be fitted with a Gaussian of FWHM 0.46" (4.6 pixels) but cannot be resolved i…
Infrared Observations of the Transition from Chaotic to Crystalline Silicates via Thermal Annealing in the Laboratory
Hallenbeck, S.; Nuth, J.
Moments of Plasma Velocity Distributions
Schwartz, Steven J.; Fazakerley, Andrew N.; Paschmann, Götz
ORFEUS Observations of Luminous Cool Stars
Dupree, A. K.; Brickhouse, N. S.
The ORFEUS telescope obtained far-ultraviolet spectra (λλ912-1218) of three luminous cool stars: β Draconis (HD 159181) and two hybrid stars, α Aquarii (HD 209750) and α Trianguli Australis (HD 150798). Most striking is the detection of blueshifted O VI λ1032, and C III λ977 emission relative to Si III λ1206, indicating outward motion, and the mar…
Photocentre displacement of minor planets: analysis of HIPPARCOS astrometry
Hestroffer, D.
We present a study of the phase effect (or photocentre offset) on the astrometry of minor planets. Analysis of the high precision Hipparcos observations of the largest asteroids shows the validity of the model. Minor planets Ceres, Pallas, Vesta and Iris show a brightness distribution close to the lunar scattering properties, while Juno and Hebe a…
Gamma-Ray Burst Counterparts: Optical Data
Schaefer, Bradley E.; Cline, Thomas L.; Hurley, Kevin C. +1 more
The surest solution of the gamma-ray burst (GRB) mystery is to find an unambiguous low-energy quiescent counterpart. To this end, we have intensively searched within the smallest GRB error boxes for any counterpart candidates. This paper reports on 255 hr of exposure with ground-based telescopes since 1981. We report our results in the U, B, V, R.…
Magnesium isotopic composition as observed with the CELIAS/MTOF experiment on the SOHO spacecraft
Livi, S.; Hsieh, K. C.; Wurz, P. +27 more
Solar wind abundance ratios of magnesium isotopes measured with the high resolution Mass Time-of-Flight spectrometer (MTOF) of the Charge, Element, and Isotope Analysis System (CELIAS) experiment on board the Solar and Heliospheric Observatory (SOHO) are presented. MTOF, as part of CELIAS, is, because of its high time and mass resolution, an excel…
Identification of lambda Bootis stars using IUE spectra. I. Low resolution data
Solano, E.; Paunzen, E.
An analysis of the stars included in the catalogue of lambda Bootis stars by Paunzen et al. (1997) and which also have IUE observations is presented here. Population I A-F type stars as well as field horizontal branch stars were also included in the analysis. Using line-ratios of carbon to heavier elements (Al and Ni) allows us to establish unambi…