Search Publications
Missions
Journals
Publication Years
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 …
Strategy for the Inversion of Hinode Spectropolarimetric Measurements in the Quiet Sun
Tsuneta, Saku; Shimizu, Toshifumi; Ichimoto, Kiyoshi +10 more
In this paper we propose an inversion strategy for the analysis of spectropolarimetric measurements taken by Hinode in the quiet Sun. The Spectro-Polarimeter of the Solar Optical Telescope aboard Hinode records the Stokes spectra of the FeI line pair at 630.2nm with unprecendented angular resolution, high spectral resolution, and high sensitivity.…
Strong Dusty Bursts of Star Formation in Galaxies Falling into the Cluster RX J0152.7-1357
Rigby, J. R.; Rieke, G. H.; Marcillac, D. +1 more
We have observed the cluster RX J0152.7-1357 (z~0.83) at 24 µm with the Multiband Imaging Photometer for Spitzer (MIPS). We detected 22 sources associated with spectroscopically confirmed cluster members, while 10 more have photometric redshifts compatible with membership. Two of the 32 likely cluster members contain obvious active nuclei, w…
Recent theoretical and observational developments in magnetic helicity studies
Démoulin, P.
Magnetic helicity quantifies how the magnetic field is sheared and twisted compared to its lowest energy state (potential field). Such stressed magnetic fields are usually observed in association with flares, eruptive filaments, and coronal mass ejections (CMEs). Magnetic helicity plays a key role in magnetohydrodynamics because it is almost prese…
IR Observations of MS 1054-03: Star Formation and Its Evolution in Rich Galaxy Clusters
Tran, Kim-Vy H.; Rieke, George H.; Rieke, Marcia J. +6 more
We study the IR properties of galaxies in the cluster MS 1054-03 at z=0.83 by combining MIPS 24 µm data with spectra of more than 400 galaxies and a very deep K-band-selected catalog. Nineteen IR cluster members are selected spectroscopically, and an additional 15 are selected by their photometric redshifts. We derive the IR luminosity funct…
Little or no solar wind enters Venus' atmosphere at solar minimum
Barabash, S.; Russell, C. T.; Lammer, H. +26 more
Venus has no significant internal magnetic field, which allows the solar wind to interact directly with its atmosphere2,3. A field is induced in this interaction, which partially shields the atmosphere, but we have no knowledge of how effective that shield is at solar minimum. (Our current knowledge of the solar wind interaction with Ve…
Chemical Abundances in an AGN Environment: X-Ray/UV Campaign on the Markarian 279 Outflow
Laor, Ari; Scott, Jennifer E.; Kriss, Gerard A. +11 more
We present the first reliable determination of chemical abundances in an active galactic nucleus (AGN) outflow. The abundances are extracted from the deep and simultaneous Far Ultraviolet Spectroscopic Explorer (FUSE) and Hubble Space Telescope (HST) STIS observations of Mrk 279. This data set is exceptional for its high signal-to-noise ratio, unb…
Gemini GMOS/IFU spectroscopy of NGC 1569 - I. Mapping the properties of a young star cluster and its environment
Gallagher, J. S.; Smith, L. J.; Westmoquette, M. S. +1 more
We present Gemini-North GMOS/IFU observations of a young star cluster and its environment near the centre of the dwarf irregular starburst galaxy NGC 1569. This forms part of a larger and ongoing study of the formation and collimation mechanisms of galactic winds, including three additional IFU pointings in NGC 1569 covering the base of the galact…
High-resolution FUSE and HST ultraviolet spectroscopy of the white dwarf central star of Sh 2-216
Rauch, T.; Werner, K.; Kruk, J. W. +5 more
Context: We perform a comprehensive spectral analysis of
Aims: