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Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations
Jorissen, A.; Pourbaix, D.; Udry, S. +4 more
Context: This paper is a follow-up on the vast effort to collect radial velocity data for stars belonging to the Hipparcos survey.
Aims: We aim at extending the orbital data available for binaries with M giant primaries. The data presented in this paper will be used in the companion papers of this series to (i) derive the binary frequency amon…
The Suzaku View of the Swift/BAT Active Galactic Nuclei. II. Time Variability and Spectra of Five "Hidden" Active Galactic Nuclei
Ueda, Yoshihiro; Terashima, Yuichi; Mushotzky, Richard F. +1 more
The fraction of Compton-thick sources is one of the main uncertainties left in understanding the active galactic nucleus (AGN) population. The Swift Burst Alert Telescope (BAT) all-sky survey for the first time gives us an unbiased sample of AGNs for all but the most heavily absorbed sources N H > 1025 cm-2). St…
Direct Detection of a Flared Disk Around a Young Massive Star HD200775 and its 10 to 1000 AU Scale Properties
Onaka, T.; Sakon, I.; Kataza, Hirokazu +9 more
We made mid-infrared (MIR) observations of the 10 M sun Herbig Be star HD200775 with the Cooled Mid-Infrared Camera and Spectrometer on the 8.2 m Subaru Telescope. We discovered diffuse emission of an elliptical shape extended in the north-south direction in an ~1000 AU radius around unresolved excess emission. The diffuse emission is p…
The Shape and Surface Variation of 2 Pallas from the Hubble Space Telescope
Russell, C. T.; Stern, S. A.; Mutchler, M. J. +8 more
We obtained Hubble Space Telescope images of 2 Pallas in September 2007 that reveal distinct color and albedo variations across the surface of this large asteroid. Pallas’s shape is an ellipsoid with radii of 291 (±9), 278 (±9), and 250 (±9) kilometers, implying a density of 2400 (±250) kilograms per cubic meter—a value consistent with a body that…
Behavior of the Spines in a Quiescent Prominence Observed by Hinode/SOT
Goode, P. R.; Cao, W.; Ning, Z.
We report the behaviors of the spines in a quiescent prominence from the observations on 2008 January 15 made with Hinode/SOT in Hα +0.076 Å, Hα-0.34 Å, and Ca II H line filters. Two spines (1 and 2) are visible in this event. In the spacetime plots of the Hα and Ca II intensities, the two spines seem to gradually move closer together, and finally…
Optical spectroscopy of X-Mega targets in the Carina nebula - VII. On the multiplicity of Tr16-112, HD93343 and HD93250
Gosset, E.; Nazé, Y.; Rauw, G. +4 more
We present the results of a spectroscopic monitoring campaign devoted to three O-type stars in the Carina nebula. We derive the full SB2 orbital solution of the binary system Tr16-112, an exceptional dissymmetrical system consisting of an O5.5-6V((f+?p)) primary and a B2V-III secondary. We also report on low-amplitude brightness variati…
The putative mechanical strength of comet surface material applied to landing on a comet
Kührt, Ekkehard; Ulamec, Stephan; Biele, Jens +3 more
The comet lander PHILAE (part of the ESA mission ROSETTA) is going to touch down on comet 67P/Churyumov-Gerasimenko in 2014. Landing dynamics depend on the mechanical strength of the surface material: in an extremely soft material, the lander (100 kg, 1 m/s touch-down velocity) may sink in too deep for successful operation while on a very hard sur…
Positive identification of lake strandlines in Shalbatana Vallis, Mars
Hynek, Brian M.; Di Achille, Gaetano; Searls, Mindi L.
Remote sensing studies of possible Martian paleolakes have hinted at the presence of paleoshorelines on Mars, although have never been unequivocally identified. Recently-acquired sub-meter scale High Resolution Imaging Science Experiment (HiRISE) images of Shalbatana Vallis reveal the first direct evidence of strandlines along a delta formed withi…
Formation, Interaction and Merger of an Active Region and a Quiescent Filament Prior to Their Eruption on 19 May 2007
van Driel-Gesztelyi, L.; Bone, L. A.; Culhane, J. L. +2 more
We report observations of the formation of two filaments - one active and one quiescent, and their subsequent interactions prior to eruption. The active region filament appeared on 17 May 2007, followed by the quiescent filament about 24 hours later. In the 26 hour interval preceding the eruption, which occurred at around 12:50 UT on 19 May 2007, …
A Near-Infrared Excess in the Continuum of High-redshift Galaxies: A Tracer of Star Formation and Circumstellar Disks?
Glazebrook, Karl; McCarthy, Patrick J.; Yan, Haojing +13 more
A broad continuum excess in the near-infrared, peaking in the rest frame at 2-5 µm, is detected in a spectroscopic sample of 88 galaxies at 0.5 < z < 2.0 taken from the Gemini Deep Deep Survey. Line emission from polycyclic aromatic hydrocarbons (PAHs) at 3.3 µm alone cannot explain the excess, which can be fit by a spectral comp…