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ASPERA-3 on Mars Express
Barabash, Stas; Lundin, Rickard
The Correlation Dimension of Young Stars in Dwarf Galaxies
Odekon, Mary Crone
We present the correlation dimension of resolved young stars in four actively star-forming dwarf galaxies that are sufficiently resolved and transparent to be modeled as projections of three-dimensional point distributions. We use data from the Hubble Space Telescope archive; photometry for one of the galaxies, UGCA 292, is presented here for the …
Mass segregation in rich LMC clusters from modelling of deep HST colour-magnitude diagrams
Santiago, B. X.; Kerber, L. O.
Aims.We used the deep colour-magnitude diagrams (CMDs) of five rich LMC clusters (NGC 1805, NGC 1818, NGC 1831, NGC 1868, and Hodge 14) observed with HST/WFPC2 to derive their present day mass function (PDMF) and its variation with position within the cluster.
Methods: .The PDMF was parameterized as a power law in the available main-sequence …
Are high-latitude forward-reverse shock pairs driven by CME overexpansion?
Zurbuchen, T. H.; Manchester, W. B.
During its passage through the high-latitude heliosphere, Ulysses observed interplanetary coronal mass ejections (ICMEs) bounded by shocks. These forward-reverse shock pairs have only been observed at high latitude in the fast solar wind. It has been suggested (e.g., Gosling et al., 1995) that these shock pairs are the result of expansion of coron…
The planetary fourier spectrometer (PFS) onboard the European Venus Express mission
Baines, K. H.; Grigoriev, A.; Bellucci, G. +47 more
The planetary fourier spectrometer (PFS) for the Venus Express mission is an infrared spectrometer optimized for atmospheric studies. This instrument has a short wavelength (SW) channel that covers the spectral range from 1700 to 11400 cm -1 (0.9-5.5 µm) and a long wavelength (LW) channel that covers 250-1700 cm -1 (5.5…
Analysis of δ Librae including Hipparcos astrometry
Demircan, O.; Bakış, V.; Hadrava, P. +3 more
New spectroscopy of the classical Algol system δ Lib, combined with high-quality optical and infrared photometry, provides the basis for a good understanding of the close binary system's main parameters. Detailed analysis of the photometry reveals the significant role of a third light source, pointing to the existence of a companion to the eclipsi…
NRLEUV 2: A new model of solar EUV irradiance variability
Warren, Harry P.
NRLEUV represents an independent approach to modeling the Sun's EUV irradiance and its variability. Instead of relying on existing irradiance observations, our model utilizes differential emission measure distributions derived from spatially and spectrally resolved solar observations, full-disk solar images, and a database of atomic physics parame…
The Low-Mass Initial Mass Function of the Field Population in the Large Magellanic Cloud with Hubble Space Telescope WFPC2 Observations
Henning, Th.; Brandner, W.; Gouliermis, D.
We present V- and I-equivalent HST WFPC2 stellar photometry of an area in the Large Magellanic Cloud (LMC), located to the west of the bar of the galaxy, which accounts for the general background field of its inner disk. The WFPC2 observations reach magnitudes as faint as V=25 mag, and the large sample of more than 80,000 stars allows us to determ…
Kinetic signatures during a quasi-continuous lobe reconnection event: Cluster Ion Spectrometer (CIS) observations
Lundin, R.; Balogh, A.; Dandouras, I. +10 more
On 3 December 2001 the Cluster spacecraft observed a long-lasting lobe reconnection event in the southern high-latitude dusk magnetopause (MP) tailward of the cusp, during a 4 hour interval of mainly northward interplanetary magnetic field (IMF) and of sub-Alfvénic magnetosheath flow. Almost all the MP encounters have accelerated flows (for which …
UBVI CCD Photometry of the Old Open Cluster Berkeley 17
Chaboyer, Brian; Krusberg, Zosia A. C.
Photometric UBVI CCD photometry is presented for NGC 188 and Berkeley 17. Color-magnitude diagrams (CMDs) are constructed and reach well past the main-sequence turnoff for both clusters. Cluster ages are determined by means of isochrone fitting to the cluster CMDs. These fits are constrained to agree with spectroscopic metallicity and reddening es…