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IR photometry and models for the dust envelopes of two carbon stars
Bogdanov, M. B.; Taranova, O. G.
The results of JHKLM photometry of two carbon stars are presented: the irregular variable NQ Cas and the Mira star BD Vul. Data on the mean fluxes supplemented with mid-IR observations with the IRAS, AKARI, andWISE satellites are used to compute spherically symmetrical model dust envelopes for the stars, consisting of particles of amorphous carbon…
Mineralogy of an OH/IR superwind
Lombaert, R.; de Vries, B. L.; Hillen, M.
The mineralogy of the dense, dusty superwind of OH/IR stars can provide important constraints for understanding the dust formation process as well as the acceleration of the wind. We aim to model the ISO-SWS spectrum of the OH/IR star OH 30.1-0.7 in detail by reproducing the slope of the spectral energy distribution in the continuum regions betwee…
Rosetta ends 2-year comet mission with final descent
Clery, Daniel
Modern CCD Observations of Selected Minor Planets for the Connection of Dynamic and Kinematic Coordinate Systems
Maigurova, N.; Pomazan, A.
One of the methods of determining the orientation parameters of the dynamic and kinematic coordinate systems is to use of long-term series of ground-based observations of selected asteroids. For achievement of the best accuracy of the link parameters the high precision and uniformly covering the asteroids orbit observations are necessary. The anal…
De la boule de neige sale au canard en caoutchouc noir, 67P/ Churyumov Gerasimenko, From the dirty snowball to the rubber black duck, 67P/ Churyumov Gerasimenko
Borg, Janet
Rosetta has ended its mission on 30 September 2016 with a controlled impact in the Ma'at region on the small lobe of comet 67P/ Churyumov Gerasimenko. Since its arrival in the vicinity of the comet in august 2014, Rosetta has spent more than two years living with the comet, investigating its nucleus and its environment. It has witnessed how a come…
II Zwicky 23 and Family: A Group in Interaction
Rudie, Gwen C.; Gallagher, John S., III; Cigan, Phillip J. +1 more
II Zw 23 (UGC 3179) is a luminous (M B ∼ -21) nearby compact narrow emission line starburst galaxy with blue optical colors and strong emission lines. We present a photometric and morphological study of II Zw 23 and its interacting companion, KPG103a, using data obtained with the WIYN 3.5 m telescope in combination with a WFPC2 image …
Nonlinear effects related to circularly polarized dispersive Alfvén waves
Sharma, R. P.; Gaur, Nidhi; Sharma, Swati
In situ measurements of solar wind have strongly implicated its turbulent behavior. The observed power spectra report a breakpoint around length scales of the order of ion scales. As one of the responsible mechanisms for the observed steepening in power spectrum, our approach includes a right circularly polarized dispersive Alfvén wave (DAW) with …
Behind the Scenes of the Discovery Channel's Rosetta Mission Documentary Special
Ayres, S.
On the evening of 12 November 2014, the Discovery Channel documentary Landing on a Comet: Rosetta Mission was broadcast around the world. This was the culmination of months of preparation and behind-the-scenes lming. Shelley Ayres, the producer, director and writer of the one-hour special recounts how this came about and re ects on her experience.
First Search for an X-Ray-Optical Reverberation Signal in an Ultraluminous X-Ray Source
Cenko, S. Bradley; Gandhi, Poshak; Mushotzky, Richard F. +3 more
Using simultaneous optical (VLT/FORS2) and X-ray (XMM-Newton) data of NGC 5408, we present the first ever attempt to search for a reverberation signal in an ultraluminous X-ray source (NGC 5408 X-1). The idea is similar to active galactic nucleus broad line reverberation mapping where a lag measurement between the X-ray and the optical flux combin…
Peculiar Velocity Effects on the CMB
Quartin, Miguel
The aberration effect due to our peculiar velocity <math xmlns:xlink="http://www.w3.org/1999/xlink"> <mi>β</mi> boldsymbol{β } with respect to the CMB induces mixing among multipoles and off-diagonal correlations at all scales which can be used as a measurement of <math xmlns:xlink="http://www.w3.org/1999/xlink"> <mi>…