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OB Stars in the Solar Neighborhood. II. Kinematics
Alfaro, E. J.; Cabrera-Caño, J.; Elias, F.
Using the spatial classification method and the structural parameters estimated for the Gould Belt (GB) and the local Galactic disk (LGD) from a previous paper, we have evaluated spatial membership probabilities for a sample of O and B stars from the Hipparcos catalog (Perryman and coworkers) with available proper motions and radial velocity data.…
Equatorial noise: Statistical study of its localization and the derived number density
Maksimovic, M.; de Conchy, Y.; Santolík, O. +5 more
Results of a statistical study of equatorial noise emissions are presented. These electromagnetic emissions are observed in the inner magnetosphere in the vicinity of the geomagnetic equator at frequencies below the lower hybrid frequency. We use the data recorded by four Cluster spacecraft during years 2001-2003. The data set was processed in thr…
Eta Carinae across the 2003.5 Minimum: The Character and Variability of the Ejecta Absorption in the Near-Ultraviolet
Gull, T. R.; Nielsen, K. E.; Kober, G. Vieira
We present Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) high-resolution near-ultraviolet (NUV) spectra of η Car's central source recorded before, during and after the 2003.5 spectroscopic minimum. Our focus is on the narrow absorption lines formed in multiple circumstellar shells, superimposed on the broad P Cygni stell…
Discovery of a relativistic Fe line in PG 1425+267 with XMM-Newton and study of its short time-scale variability
Fabian, A. C.; Miniutti, G.
We report results from the XMM-Newton observation of the radio-loud quasar PG 1425+267 (z= 0.366). The X-ray data above 2keV exhibit a double-peaked emission feature in the Fe K band. The higher energy peak is found at 6.4keV and is consistent with being narrow, while the lower energy one is detected at 5.3keV and is much broader than the detector…
The OSACA database and a kinematic analysis of stars in the solar neighborhood
Bobylev, V. V.; Bajkova, A. T.; Goncharov, G. A.
We transformed radial velocities compiled from more than 1400 published sources, including the Geneva-Copenhagen survey of the solar neighborhood (CORAVEL-CfA), into a uniform system based on the radial velocities of 854 standard stars in our list. This enabled us to calculate the average weighted radial velocities for more than 25000 HIPPARCOS st…
Hubble Space Telescope Identification of the Optical Counterparts of Ultraluminous X-Ray Sources in M51
Terashima, Yuichi; Wilson, Andrew S.; Inoue, Hirohiko
We present the results of a search for optical identifications of ultraluminous X-ray sources (ULXs) in M51 by using mosaic images taken with the Hubble Space Telescope(HST) Advanced Camera for Surveys (ASC) in filters F435W (B), F555W (V), F814W (I), and F658N (Hα). Our sample, consisting of nine ULXs, is defined by analyzing the three Chandra ob…
Enceladus: A Source of Nitrogen and an Explanation for the Water Vapor Plume Observed by Cassini
Loeffler, M. J.; Raut, U.; Baragiola, R. A.
Recently, the Cassini spacecraft observed an unexpected emission of plumes of water vapor, nitrogen, and icy particles from the southern polar region of Saturn's icy moon Enceladus. While these findings support previous ideas of geological activity in this icy moon, there is no experimental evidence explaining how these plumes could be produced at…
ISO mid-infrared spectroscopy of Galactic Bulge AGB stars
Blommaert, J. A. D. L.; Ganesh, S.; Glass, I. S. +8 more
Aims.To study the nature of Bulge AGB stars and in particular their circumstellar dust, we have analysed mid-infrared spectra obtained with the ISOCAM CVF spectrometer in three Bulge fields.
Methods: .The ISOCAM 5-16.5 µm CVF spectra were obtained as part of the ISOGAL infrared survey of the inner Galaxy. A classification of the shape o…
The massive star population in the giant HII region Tol89 in NGC5398
Smith, Linda J.; Crowther, Paul A.; Sidoli, Fabrizio
We present new high spectral resolution Very Large Telescope (VLT)/UV-Visual Echelle Spectrograph (UVES) spectroscopy and archival Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) imaging and spectroscopy of the giant HII region Tol89 in NGC5398. From optical and ultraviolet (UV) HST images, we find that the star-forming co…
Vertical wind shear on Jupiter from Cassini images
West, Robert A.; Porco, Carolyn C.; Ingersoll, Andrew P. +5 more
Multifilter images of Jupiter acquired by the Cassini Imaging Science Subsystem (ISS) are used to derive zonal winds at altitudes above and below the visible cloud deck. Small features unique to the ultraviolet images of ISS are tracked to get the systematic high-altitude zonal winds. Comparison between the zonal winds from ultraviolet images and …