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Optical spectra of five new Be/X-ray binaries in the Small Magellanic Cloud and the link of the supergiant B[e] star LHA 115-S 18 with an X-ray source
Hatzidimitriou, D.; Zezas, A.; Antoniou, V. +1 more
The Small Magellanic Cloud (SMC) is well known to harbour a large number of high-mass X-ray binaries (HMXBs). The identification of their optical counterparts provides information on the nature of the donor stars and can help to constrain the parameters of these systems and their evolution. We obtained optical spectra for a number of HMXBs identif…
Temporal Spectral Shift and Polarization of a Band-splitting Solar Type II Radio Burst
Li, Gang; Chen, Yao; Feng, Shiwei +4 more
In many type II solar radio bursts, the fundamental and/or the harmonic branches of the bursts can split into two almost parallel bands with similar spectral shapes and frequency drifts. However, the mechanisms accounting for this intriguing phenomenon remain elusive. In this study, we report a special band-splitting type II event in which spectra…
Cosmological parameter estimation from CMB and X-ray cluster after Planck
Hu, Bin; Cai, Rong-Gen; Guo, Zong-Kuan +1 more
We investigate constraints on cosmological parameters in three 8-parameter models with the summed neutrino mass as a free parameter, by a joint analysis of CCCP X-ray cluster data, the newly released Planck CMB data as well as some external data sets including baryon acoustic oscillation measurements from the 6dFGS, SDSS DR7 and BOSS DR9 surveys, …
Discrepancy between ionopause and photoelectron boundary determined from Mars Express measurements
Barabash, S.; Wei, Y.; Andrews, D. J. +9 more
The Martian ionosphere directly interacts with the solar wind due to lack of a significant intrinsic magnetic field, and an interface is formed in between. The interface is usually recognized by two kinds of indicators: the ionopause identified from ionospheric density profiles and the photoelectron boundary (PEB) determined from the electron ener…
HIP 3678: a hierarchical triple stellar system in the centre of the planetary nebula NGC 246
Mugrauer, M.; Adam, C.
We report the detection of a new low-mass stellar companion to the white dwarf HIP 3678 A, the central star of the planetary nebula NGC 246. The newly found companion is located about 1 arcsec (at projected separation of about 500 au) north-east of HIP 3678 A, and shares a common proper motion with the white dwarf and its known comoving companion …
Ultracompact dwarfs around NGC 3268
Richtler, Tom; Smith Castelli, Analía V.; Caso, Juan Pablo +2 more
We present radial velocities (from Gemini/GMOS) of the second sample of ultracompact dwarfs (UCDs) and bright globular clusters (GCs) in the Antlia cluster. 23 objects are located around the giant elliptical NGC 3268, and one is close to the fainter lenticular NGC 3273. Together with previously found UCDs around NGC 3258, a total of 35 UCDs and br…
A Herschel view of IC 1396 A: Unveiling the different sequences of star formation
Henning, Thomas; Currie, Thayne; Rivière-Marichalar, Pablo +5 more
Context. The IC 1396 A globule, located to the west of the young cluster Tr 37, is known to host many very young stars and protostars, and is also assumed to be a site of triggered star formation.
Aims: Our aim is to test the triggering mechanisms and sequences leading to star formation in Tr 37 and similar regions.
Methods: We mapped IC…
Changes to Saturn's Zonal-mean Tropospheric Thermal Structure after the 2010-2011 Northern Hemisphere Storm
Fletcher, L. N.; Flasar, F. M.; Achterberg, R. K. +4 more
We use far-infrared (20-200 µm) data from the Composite Infrared Spectrometer on the Cassini spacecraft to determine the zonal-mean temperature and hydrogen para-fraction in Saturn's upper troposphere from observations taken before and after the large northern hemisphere storm in 2010-2011. During the storm, zonal mean temperatures in the la…
From Voyager-IRIS to Cassini-CIRS: Interannual variability in Saturn’s stratosphere?
Fletcher, L. N.; Irwin, P. G. J.; Sinclair, J. A. +4 more
We present an intercomparison of Saturn’s stratosphere between Voyager 1-IRIS observations in 1980 and Cassini-CIRS observations in 2009 and 2010. Over a saturnian year (∼29.5 years) has now passed since the Voyager flybys of Saturn in 1980/1981. Cassini observations in 2009/2010 capture Saturn in the same season as Voyager observations (just afte…
Far-infrared Extinction Mapping of Infrared Dark Clouds
Tan, Jonathan C.; Lim, Wanggi
Progress in understanding star formation requires detailed observational constraints on the initial conditions, i.e., dense clumps and cores in giant molecular clouds that are on the verge of gravitational instability. Such structures have been studied by their extinction of near-infrared and, more recently, mid-infrared (MIR) background light. It…