Search Publications
Spatial distribution and kinematics of OB stars
Gontcharov, G. A.
The sample of 37 485 suspected OB stars selected by Gontcharov (2008) from the Tycho-2 catalogue has been cleaned of the stars that are not of spectral types OV-A0V. For this purpose, the apparent magnitude V T from Tycho-2, the absolute magnitude M_{V_T } calibrated as a function of the dereddened color index ( B T - V <…
Kinetic models of current sheets with a sheared magnetic field
Malova, H. V.; Popov, V. Yu.; Zelenyi, L. M. +5 more
Thin current sheets, whose existence in the Earth's magnetotail is confirmed by numerous spacecraft measurements, are studied analytically and numerically. The thickness of such sheets is on the order of the ion Larmor radius, and the normal component of the magnetic field (Bz) in the sheet is almost constant, while the tangential (B
The Illumination and Growth of CRL 2688: An Analysis of New and Archival Hubble Space Telescope Observations
Frank, Adam; Corradi, Romano L. M.; Balick, Bruce +3 more
We present four-color images of CRL 2688 obtained in 2009 using the Wide-Field Camera 3 on Hubble Space Telescope. The F606W image is compared with archival images in very similar filters to monitor the proper motions of nebular structure. We find that the bright N-S lobes have expanded uniformly by 2.5% and that the ensemble of rings has translat…
A predator-prey model for moon-triggered clumping in Saturn's rings
Colwell, Joshua E.; Esposito, Larry W.; Sremčević, Miodrag +4 more
UVIS occultation data show clumping in Saturn's F ring and at the B ring outer edge, indicating aggregation and disaggregation at these locations that are perturbed by Prometheus and by Mimas. The inferred timescales range from hours to months. Occultation profiles of the edge show wide variability, indicating perturbations by local mass aggregati…
Characterization of the Distribution of the Lyα Emitters in the 53w002 Field at z = 2.4
Yamada, T.; Matsuda, Y.; Hayashino, T. +2 more
We present the results of our wide-field narrowband imaging of the field around the radio galaxy 53W002 at z = 2.390 with Subaru/Suprime-Cam. A custom-made filter, NB413, centered at 4140 Å with a width of 83 Å is used to observe the 31' × 24' area around the radio galaxy. We detected 204 Lyα emitters (LAEs) at z = 2.4 with a rest-frame equivalent…
Hydrogen and methane in Titan's atmosphere: chemistry, diffusion, escape, and the Hunten limiting flux principle (This article is part of a Special Issue that honours the work of Dr. Donald M. Hunten FRSC who passed away in December 2010 after a very illustrious career)
Strobel, Darrell F.
One of Professor Donald M. Hunten's lasting contributions to the field of planetary atmospheres was the principle of the (Hunten) limiting flux, where the escape of light species is limited by the rate at which they can diffuse through the atmosphere. While his limiting flux expression has been well tested for hydrogen's escape from the Earth's at…
Emitted power of Jupiter based on Cassini CIRS and VIMS observations
West, Robert A.; Baines, Kevin H.; Nixon, Conor A. +11 more
The emitted power of Jupiter and its meridional distribution are determined from observations by the Composite Infrared Spectrometer and Visual and Infrared Mapping Spectrometer onboard Cassini during its flyby en route to Saturn in late 2000 and early 2001. Jupiter's global-average emitted power and effective temperature are measured to be 14.10 …
Rapid Transition of Uncombed Penumbrae to Faculae during Large Flares
Liu, Chang; Wang, Haimin; Deng, Na
In the past two decades, the complex nature of sunspots has been disclosed with high-resolution observations. One of the most important findings is the "uncombed" penumbral structure, where a more horizontal magnetic component carrying most of Evershed flows is embedded in a more vertical magnetic background. The penumbral bright grains are locati…
New insights into the star formation histories of candidate intermediate-age early-type galaxies from K'-band imaging of globular clusters
Georgiev, Iskren Y.; Goudfrooij, Paul; Puzia, Thomas H.
We investigate the age and metallicity distributions of bright globular clusters (GCs) in the candidate intermediate-age early-type galaxies NGC 3610, 584 and 3377 using a combination of new Gemini's Near InfraRed Imager and Spectrometer K'-band imaging and existing optical VI photometry from Hubble Space Telescope data. The V-I versus I-K' colour…
The Acceleration Region of Stable Auroral Arcs
Karlsson, T.