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Structure and kinematics of the interstellar medium in the star-forming region in the BCD galaxy VII Zw 403 (UGC 6456)
Moiseev, A. V.; Lozinskaya, T. A.; Egorov, O. V. +1 more
The structure and kinematics of ionized supershells in the star-forming region in the BCD galaxy VII Zw 403 (UGC 6456) are analyzed using observations with the SCORPIO focal reducer on the 6-m Special Astrophysical Observatory telescope in three modes: direct imaging (in the Hα, [O III], and [S II] lines), long-slit spectroscopy, and spectroscopy …
Electrodynamics of a split-transpolar aurora
RèMe, H.; Lester, M.; Dunlop, M. W. +6 more
We report new results on the relation between drift velocity shear, average inverted V energy, and the separation of bifurcated high-latitude Sun-aligned polar arcs within a global transpolar auroral arc system. The two parallel arcs appeared at the location of converging -v × B electric field of two sunward flow channels that were separated by an…
Photoelectric radial velocities, Paper XVII The orbits of 30 spectroscopic binaries in the southern Clube Selected Areas
Griffin, R. F.
Three of the six southern Clube Areas that were mainly observed at the European Southern Observatory and whose principal results are given in Paper XVI are marginally observable from Haute-Provence. Additional measurements obtained on several observing runs there enabled orbits to be determined (in most cases rather poorly, owing to the paucity of…
XMM-Newton survey of two upper Scorpius regions
Micela, G.; Peres, G.; Favata, F. +4 more
Aims.We studied X-ray emission from young stars by analyzing the deep XMM-Newton observations of two regions of the Upper Scorpius association with an age of 5 Myr.
Methods: .Based on near infrared and optical photometry we identified 22 Upper Scorpius photometric members among the 224 detected X-ray sources. We derived coronal properties of U…
ESO imaging survey: optical follow-up of 12 selected XMM-Newton fields
Motch, C.; Zaggia, S.; Watson, M. G. +12 more
This paper presents the data recently released for the XMM-Newton/WFI survey carried out as part of the ESO Imaging Survey (EIS) project. The aim of this survey is to provide optical imaging follow-up data in BVRI for identification of serendipitously detected X-ray sources in selected XMM-Newton fields. In this paper, fully calibrated individual …
Reconstructing the weather on Mars at the time of the MERs and Beagle 2 landings
Withers, P.; Lewis, S. R.; Read, P. L. +1 more
We reconstruct the temperature, wind and density structure of the atmosphere on Mars from the surface to 120 km altitude at the time of the landing of the two NASA Mars Exploration Rovers (MER), and ESA's ``Beagle 2.'' This reconstruction is based on an assimilation of temperature and dust opacity observations from the Thermal Emission Spectromete…
The thermosphere of Venus and its exploration by a Venus Express Accelerometer Experiment
Müller-Wodarg, I. C. F.; Forbes, J. M.; Keating, G. M.
The forthcoming observations by Venus Express provide an ideal opportunity to comprehensively study the atmosphere of Venus for the first time since Pioneer Venus (1978-1992), and for the first time ever in detail at polar latitudes. This article reviews some of our current knowledge from space and ground-based observations about the upper atmosph…
Experimental study of nonlinear interaction of plasma flow with charged thin current sheets: 1. Boundary structure and motion
André, M.; Khotyaintsev, Y.; Rème, H. +13 more
We study plasma transport at a thin magnetopause (MP), described hereafter as a thin current sheet (TCS), observed by Cluster at the southern cusp on 13 February 2001 around 20:01 UT. The Cluster observations generally agree with the predictions of the Gas Dynamic Convection Field (GDCF) model in the magnetosheath (MSH) up to the MSH boundary laye…
A High-Resolution Spectral Atlas of α Persei from 3810 to 8100 Å
Galazutdinov, G. A.; Lee, Byeong-Cheol; Park, Myeong-Gu +5 more
We present a high-resolution (λ/δλ=90,000) spectral atlas of the F5 Ib star α Per covering the 3810-8100 Å region. The atlas, based on data obtained with the aid of the echelle spectrograph BOES fed by the 1.8 m telescope at Bohyunsan Observatory (Korea), is the result of the co-addition of a few well-exposed spectra. The final signal-to-noise rat…
Ultra-luminous sources in nearby galaxies
Mushotzky, Richard
This paper presents an update of what we have learned in the last year about the ULX phenomenon. New results are presented on radio emission from Holmberg II and a review is given on the recent X-ray data on timing and spectra. The new X-ray spectroscopic and optical imaging survey of nearby ULX with XMM allows us, for the first time, to place the…