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The Inner Nebula and Central Binary of the Symbiotic Star HM Sagittae
Davis, R. J.; Eyres, S. P. S.; Bode, M. F. +2 more
We present contemporaneous Hubble Space Telescope Wide Field Planetary Camera 2 and Very Large Array observations of the symbiotic nova HM Sge. We identify a number of discreet features at spatial scales smaller than ~0.1" embedded in the extended nebula, with radio and optical emission well correlated in the inner 1". For the first time we measur…
WIYN Open Cluster Study. VII. NGC 2451A and the Hipparcos Distance Scale
Deliyannis, Constantine P.; Kozhurina-Platais, Vera; Girard, Terrence M. +5 more
We provide new evidence that NGC 2451A is undoubtedly a young open cluster, although sparsely populated. New cluster membership has been derived from relative proper motions of 5868 stars. In total, 136 stars down to V~15 have membership probability Pµ>=2%. New CCD BV photometry indicates that about 70 stars are indeed main-seq…
Observed and Predicted Ratios of the Horizontal and Vertical Components of the Solar p-Mode Velocity Eigenfunctions
Kosovichev, Alexander G.; Schou, Jesper; Rhodes, Edward J., Jr. +2 more
We present evidence that the observed ratios of the horizontal and vertical components of the solar intermediate-degree p-mode velocity eigenfunctions closely match theoretical predictions of these ratios. This evidence comes from estimates of the observed eigenfunction component ratios that were obtained from the fitting of the p-mode oscillation…
Cosmic Ray Modulation over the Poles at Solar Maximum: Observations
Heber, B.; Marsden, R. G.
Our knowledge of how galactic and anomalous cosmic rays are modulated in the inner heliosphere has been dramatically enlarged as a result of measurements from several missions launched in the past ten years. Among them, Ulysses explored the polar regions of the inner heliosphere during the last solar minimum period and is now revisiting southern p…
Discovery of pulsations from the Be/X-ray binary RXJ0101.3-7211 in the SMC by XMM-Newton
Pietsch, W.; Haberl, F.; Sasaki, M. +1 more
We report pulsations in the X-ray flux of
Compact Star Clusters in M81. II. Two Populations
Chandar, Rupali; Ford, Holland C.; Tsvetanov, Zlatan
We present the color and magnitude distributions of compact star clusters discovered in the early-type spiral galaxy M81, from Hubble Space Telescope Wide Field Planetary Camera 2 B, V, and I-band imaging. These clearly show the presence of two cluster populations-a typical red globular cluster system, as well as a young population, which was not …
Solar wind plasma parameters on Ulysses: Detailed comparison between the URAP and SWOOPS experiments
McComas, D. J.; Issautier, Karine; Gosling, J. T. +2 more
The presence of several instruments measuring plasma parameters aboard Ulysses made possible an extensive comparison between them. In this paper, we focus on solar wind electron parameters measured by the Unified RAdio and Plasma (URAP) wave receiver, using the thermal noise spectroscopy method, and by the Solar Wind Observations Over the Poles of…
The Location of the Nucleus and the Morphology of Emission-Line Regions in NGC 1068
Chary, Ranga-Ram; Thompson, Rodger I.; Corbin, Michael R. +1 more
This Letter presents new Near-Infrared Camera and Multi-Object Spectrometer data on the location of the nucleus and the morphology of hydrogen and [Si VI] emission in NGC 1068. The peak of the emission at 2.2 µm is a strong point source that marks the location of the nucleus. The [Si VI] line emission region consists of two main components, …
Molecular Gas and Star Formation in NGC 3077
Meier, David S.; Turner, Jean L.; Beck, Sara C.
We present high-resolution (~2.5") CO(1-0) and CO(2-1) images of the central 1 kpc of NGC 3077 made with the Owens Valley Millimeter Array. CO emission is distributed in three major complexes, which resolve into at least seven giant molecular clouds (GMCs). Two complexes are associated with the central starburst. A third, more distant complex is n…
Variable Ultraviolet Absorption in the Spectrum of MR 2251-178
Charlton, Jane C.; Eracleous, Michael; Ganguly, Rajib
We present an ultraviolet spectrum of MR 2251-178 taken with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph (STIS) with the G230L grating. The observation is part of a snapshot program of quasars (QSOs) that systematically searches for intrinsic absorption lines through variability. The sample consists of all QSOs observed with …