Search Publications
Ulysses observations of solar energetic particles from the 14 July 2000 event at high heliographic latitudes
Giacalone, J.; McKibben, R. B.; Zhang, Ming +4 more
At the time of the solar flare on the Bastille Day of 2000, the Ulysses spacecraft was at 3.17 AU from the Sun, 62° south in heliographic latitude, and 116° in longitude east of the Earth. Solar wind and magnetic field measurements by Ulysses indicate that the coronal mass ejection (CME) of this event had a limited size in both latitude and longit…
Multiwavelength Insights into Mixed-Morphology Binary Galaxies. I. ISOCAM, ISOPHOT, and Hα Imaging
Rampazzo, Roberto; Xu, Cong; Gao, Yu +3 more
We present Hα and ISO mid- and far-IR observations for a sample of mixed-morphology galaxy pairs that reveal both the stellar and nonstellar signatures of the interaction process. A mixed-morphology pair is perhaps the simplest form of galaxy-galaxy interaction because it is expected to involve only a single rapidly rotating gas-rich component pai…
Photometry of pluto in the last decade and before: evidence for volatile transport?
Buratti, B. J.; Heinze, A.; Young, J. +7 more
Photometric observations of Pluto in the BVR filter system were obtained in 1999 and in 1990-1993, and observations in the 0.89-µm methane absorption band were obtained in 2000. Our 1999 observations yield lightcurve amplitudes of 0.30 ± 0.01, 0.26 ± 0.01, and 0.21 ± 0.02 and geometric albedos of 0.44 ± 0.04, 0.52 ± 0.03, and 0.58 ± 0.02 in …
Warm Molecular Hydrogen and Ionized Neon in the HH 2 Outflow
Cernicharo, J.; Noriega-Crespo, A.; Cesarsky, D. +3 more
We report on spectro-imaging observations of the Herbig-Haro 2 outflow with the ISOCAM camera on board the Infrared Space Observatory. The [Ne II] 12.81 µm and [Ne III] 15.55 µm lines are detected only toward the jet working surface (HH 2H), consistent with the high excitation of this knot in the optical range, while H2 pure…
Hubble Space Telescope Space Telescope Imaging Spectrograph Spectroscopy of the Intermediate Polar EX Hydrae
Szkody, Paula; Howell, Steve B.; Sion, Edward M. +2 more
We present the results of our analysis of six orbits of Hubble Space Telescope Space Telescope Imaging Spectrograph (HST/STIS) time-tagged spectroscopy of the intermediate polar, EX Hydrae. The high time and wavelength resolution of the HST/STIS spectra provided an excellent opportunity to study the UV properties of EX Hya. Measurements of the con…
The Kinematics and Physical Conditions of the Ionized Gas in Markarian 509. II. STIS Echelle Observations
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. M. +5 more
We present observations of the UV absorption lines in the luminous Seyfert 1 galaxy Mrk 509, obtained with the medium-resolution (λ/Δλ~40,000) echelle gratings of the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. The spectra reveal the presence of eight kinematic components of absorption in Lyα, C IV, and N V, at radial veloc…
On the link between rotation, chromospheric activity and Li abundance in subgiant stars
De Medeiros, J. R.; Canto Martins, B. L.; Melo, C. H. F. +2 more
The connection rotation-CaII emission flux-lithium abundance is analyzed for a sample of bona fide subgiant stars, with evolutionary status determined from HIPPARCOS trigonometric parallax measurements and from the Toulouse-Geneva code. The distribution of rotation and CaII emission flux as a function of effective temperature shows a discontinuity…
INTEGRAL observations of the black hole candidate H 1743-322 in outburst
Parmar, A. N.; Kuulkers, E.; Oosterbroek, T. +5 more
INTEGRAL made 3 observations in 2003 April of the black hole candidate H 1743-322 during the rising part, and close to the maximum, of an outburst. H 1743-322 was previously observed in outburst in 1977-1978. The source is located in a crowded region of the sky (l = 357o, b = -2o) and at least 18 sources are clearly detected …
The X-ray spectra of the flaring and quiescent states of AT Microscopii observed by XMM-Newton
Raassen, A. J. J.; Mewe, R.; Audard, M. +1 more
The X-ray spectrum of the late-type M-dwarf binary AT Mic (dM4.5e+dM4.5e) is observed in the wavelength range 1-40 Å by means of RGS and EPIC-MOS on board XMM-Newton. During the exposure a flare occured. We have performed a 3-temperature fit and a DEM-modeling to the flaring and quiescent part of the spectrum. We report the coronal temperature dis…
Variable Na I Absorption toward ρ Leonis: Biased Neutral Formation in the Diffuse Interstellar Medium?
Meyer, David M.; Lauroesch, J. T.
We present multiepoch KPNO coudé feed telescope observations of interstellar Na I and Ca II absorption toward the bright star ρ Leo. Comparisons of the Na I profiles observed over a period of 8 yr reveal significant temporal variations in the Na I column in at least one component, implying that there is ``structure'' at scales on the order of the …