Search Publications
Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data
Jorissen, A.; Frankowski, A.; Jancart, S.
Context: This paper is the last in a series devoted to the analysis of the binary content of the Hipparcos Catalogue.
Aims: The comparison of the proper motions constructed from positions spanning a short (Hipparcos) or long time (Tycho-2) makes it possible to uncover binaries with periods of the order of or somewhat larger than the short time…
Large amplitude oscillatory motion along a solar filament
Veronig, A. M.; Vršnak, B.; Thalmann, J. K. +1 more
Context: Large amplitude oscillations of solar filaments is a phenomenon that has been known for more than half a century. Recently, a new mode of oscillations, characterized by periodical plasma motions along the filament axis, was discovered.
Aims: We analyze such an event, recorded on 23 January 2002 in Big Bear Solar Observatory Hα filterg…
A dynamic upper atmosphere of Venus as revealed by VIRTIS on Venus Express
Baines, K. H.; Langevin, Y.; Lopez-Valverde, M. A. +101 more
The upper atmosphere of a planet is a transition region in which energy is transferred between the deeper atmosphere and outer space. Molecular emissions from the upper atmosphere (90-120km altitude) of Venus can be used to investigate the energetics and to trace the circulation of this hitherto little-studied region. Previous spacecraft and groun…
The Magnetic Topology of Coronal Mass Ejection Sources
Winebarger, Amy R.; Warren, Harry P.; Ugarte-Urra, Ignacio
In an attempt to test current initiation models of coronal mass ejections (CMEs), with an emphasis on the magnetic breakout model, we inspect the magnetic topology of the sources of 26 CME events in the context of their chromospheric and coronal response in an interval of approximately 9 hr around the eruption onset. First we perform current-free …
Large Amounts of Optically Obscured Star Formation in the Host Galaxies of Some Type 2 Quasars
Armus, L.; Seymour, N.; Canalizo, G. +5 more
We present Hubble Space Telescope images and spectral energy distributions from optical to infrared wavelengths for a sample of six 0.3<z<0.8 type 2 quasars selected in the mid-infrared using data from the Spitzer Space Telescope. All the host galaxies show some signs of disturbance. Most seem to possess dusty, star-forming disks. The disk i…
Differential evolution of the UV luminosity function of Lyman break galaxies from z ~ 5 to 3
Akiyama, M.; Sawicki, M.; Aoki, K. +5 more
We report the ultraviolet luminosity function (UVLF) of Lyman break galaxies at z ~ 5 derived from a deep and wide survey using the prime focus camera of the 8.2 m Subaru telescope (Suprime-Cam). Target fields consist of two blank regions of the sky, namely, the region including the Hubble Deep Field-North and the J0053+1234 region, and the total …
Stellar Kinematics in the Complicated Inner Spheroid of M31: Discovery of Substructure along the Southeastern Minor Axis and Its Relationship to the Giant Southern Stream
Gilbert, Karoline M.; Majewski, Steven R.; Guhathakurta, Puragra +9 more
We present the discovery of a kinematically cold stellar population along the southeastern minor axis of the Andromeda galaxy (M31) that is likely the forward continuation of M31's giant southern stream. This discovery was made during an on-going spectroscopic survey of M31 red giant branch (RGB) stars using the DEIMOS instrument on the Keck II 10…
High-resolution X-ray spectroscopy of T Tauri stars in the Taurus-Auriga complex
Audard, M.; Güdel, M.; Briggs, K. R. +2 more
Context: Differences have been reported between the X-ray emission of accreting and non-accreting stars. Some observations have suggested that accretion shocks could be responsible for part of the X-ray emission in classical T Tauri stars (CTTS).
Aims: We present high-resolution X-ray spectroscopy for nine pre-main sequence stars in order to t…
Space Velocities of Southern Globular Clusters. V. A Low Galactic Latitude Sample
Casetti-Dinescu, Dana I.; Girard, Terrence M.; van Altena, William F. +3 more
We have measured the absolute proper motions of globular clusters NGC 2808, 3201, 4372, 4833, 5927, and 5986. The proper motions are on the Hipparcos system, and they are the first determinations ever made for these low Galactic latitude clusters. The proper-motion uncertainties range from 0.3 to 0.5 mas yr-1. The inferred orbits indica…
The Distances to Open Clusters from Main-Sequence Fitting. IV. Galactic Cepheids, the LMC, and the Local Distance Scale
Pinsonneault, Marc H.; Terndrup, Donald M.; An, Deokkeun
We derive the basic properties of seven Galactic open clusters containing Cepheids and construct their period-luminosity (P-L) relations. For our cluster main-sequence fitting we extend previous Hyades-based empirical color-temperature corrections to hotter stars using the Pleiades as a template. We use BVICJHKs data to test …