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Penumbral Brightening Events Observed in AR NOAA 12546
Stangalini, Marco; Ermolli, Ilaria; Giorgi, Fabrizio +2 more
Penumbral transient brightening events have been attributed to magnetic reconnection episodes occurring in the low corona. We investigated the trigger mechanism of these events in active region NOAA 12546 by using multiwavelength observations obtained with the Interferometric Bidimensional Spectrometer, by the Solar Dynamics Observatory, the Inter…
The proper motion of sub-populations in ω Centauri
Pancino, E.; Sanna, N.; Stetson, P. B. +2 more
The galactic globular cluster ω Centauri is the most massive of its kind, with a complex mix of multiple stellar populations and several kinematic and dynamical peculiarities. Different mean proper motions have been detected among the three main sub-populations, implying that the most metal-rich one is of accreted origin. This particular piece of …
Searching for optical companions to four binary millisecond pulsars with the Gran Telescopio Canarias
Zharikov, S. V.; Karpova, A. V.; Zyuzin, D. A. +6 more
We report on multiband photometric observations of four binary millisecond pulsars with the Gran Telescopio Canarias. The observations led to detection of binary companions to PSRs J1630+3734, J1741+1351, and J2042+0246 in the Sloan g', r', and I' bands. Their magnitudes in the r' band are ≈24.4, 24.4, and 24.0, respectively. We also set a 3σ uppe…
Relationships between Interplanetary Coronal Mass Ejection Characteristics and Geoeffectiveness in the Declining Phase of Solar Cycles 23 and 24
Moon, Y. -J.; Shanmugaraju, A.; Lawrance, M. Bendict
In this paper, we have examined the relationships between the characteristics of interplanetary coronal mass ejections (ICMEs) and geoeffectiveness in the declining phase of Solar Cycles 23 and 24. We discuss the results in comparison with those of the rising phase. Major results of this study are as follows: The ICMEs in the declining phase of Cy…
A wide angle view of the Sagittarius dwarf spheroidal galaxy. II. A CEMP-r/s star in the Sagittarius dwarf spheroidal galaxy
Hansen, C. J.; Bonifacio, P.; Caffau, E. +5 more
We report on the discovery and chemical abundance analysis of the first CEMP-r/s star detected in the Sagittarius dwarf spheroidal galaxy (Sgr dSph) by means of UVES high-resolution spectra. The star, found in the outskirts of Sgr dSph, along the major axis of the main body, is a moderately metal-poor giant (Teff = 4753 K, log g = 1.75,…
Dust-scattering Halo and Giant Hard X-Ray Flare from the Supergiant Fast X-Ray Transient IGR J16479-4514 Investigated with XMM-Newton and INTEGRAL
Tiengo, A.; Sidoli, L.; Bird, A. J. +1 more
We report results from the analysis of XMM-Newton and INTEGRAL data of IGR J16479-4514. The unpublished XMM-Newton observation, performed in 2012, occurred during the source eclipse. No pointlike X-ray emission was detected from the source; conversely, extended X-ray emission was clearly detected up to a size distance compatible with a dust-scatte…
MNELLS: the MUSE nearby early-type galaxy lens locator survey
Lucey, John R.; Smith, Russell J.; Collier, William P.
Low-redshift strong-lensing galaxies can provide robust measurements of the stellar mass-to-light ratios in early-type galaxies (ETGs), and hence constrain variations in the stellar initial mass function (IMF). At present, only a few such systems are known. Here, we report the first results from a blind search for gravitationally lensed emission-l…
Magnetically coupled atmosphere, fast sausage MHD waves, and forced magnetic field reconnection during the SOL2014-09-10T17:45 flare
Gömöry, P.; Mészárosová, H.
Aims: We study the physical properties and behaviour of the solar atmosphere during the GOES X1.6 solar flare on 2014 September 10.
Methods: The steady plasma flows and the fast sausage MHD waves were analysed with the wavelet separation method. The magnetically coupled atmosphere and the forced magnetic field reconnection were studied w…
A normalized statistical study of Earth's cusp region based on nine-years of Cluster measurements
Xiao, Chao; Liu, WenLong; Zhang, DianJun +1 more
Hybrid star HD 81817 accompanied by brown dwarf or substellar companion
Lee, Byeong-Cheol; Park, Myeong-Gu; Bang, Tae-Yang +4 more
HD 81817 is known as a hybrid star. Hybrid stars have both cool stellar wind properties and Ultraviolet (UV) or even X-ray emission features of highly ionized atoms in their spectra. A white dwarf companion has been suggested as the source of UV or X-ray features. HD 81817 has been observed since 2004 as a part of a radial velocity (RV) survey pro…