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The inner gas mass-temperature profile in the core of nearby galaxy clusters
Fabian, Andrew C.; Pinto, Ciro; Liu, Haonan
We present a mass-temperature profile of gas within the central 10 kpc of a small sample of cool core clusters. The mass of the hottest gas phases, at 1.5 and 0.7 keV, is determined from X-ray spectra from the XMM Reflection Grating Spectrometers. The masses of the partially ionized atomic and the molecular phases are obtained from published H α a…
The hydrogen Balmer lines and jump in absorption in accretion disc modelling - an ultraviolet-optical spectral analysis of the dwarf novae UZ Serpentis and CY Lyrae
Blair, William P.; Szkody, Paula; Sion, Edward M. +1 more
The spectra of disc-dominated cataclysmic variables (CVs) often deviate from the spectra of accretion disc models; in particular, the Balmer jump and absorption lines are found to be shallower in the observations than in the models. We carried out a combined ultraviolet-optical spectral analysis of two dwarf novae (DNe): UZ Ser in outburst, declin…
Variations in Ion-Component Pressure during Dipolarization in the Near-Earth Magnetotail Plasma Sheet
Malykhin, A. Yu.; Grigorenko, E. E.; Kronberg, E. A. +1 more
The dynamics of fluxes of thermal and suprathermal H+ and O+ ions and the pressure variations of these components during 11 events of magnetic field dipolarization in the plasma sheet of the geomagnetic tail are analyzed based on Cluster satellite observations. It was found that the energy of H+ and O+ i…
White-light solar corona structure observed by naked eye and processed images
Rušin, Vojtech; Prikryl, Paul; Prikryl, Emil A.
Light and dark adaptation and luminance contrast enhancement are well-known characteristics of human vision that allow us to observe a wide range of light intensity not fully captured in standard camera images. The naked-eye observations of total eclipses, some recorded with spectacular detail in artists' paintings, reveal structure that is consis…
On the source region and orientations of nightside auroral arcs
Sergeev, V.; Bondareva, T.; Gilles, D. +1 more
Using large data base of stable auroral arcs observed at Gillam we identified those passes of POES spacecraft which were magnetically conjugate to these arcs. We studied statistically arc locations with respect to the energetic particle isotropy boundaries (IBs), which are the well-known markers of the magnetotail regions. In the dusk and night se…
A KELT-TESS Eclipsing Binary in a Young Triple System Associated with the Local "Stellar String" Theia 301
Cunningham, Joni-Marie C.; Feliz, Dax L.; Dixon, Don M. +10 more
HD 54236 is a nearby, wide common-proper-motion visual pair that has been previously identified as likely being very young by virtue of strong X-ray emission and lithium absorption. Here, we report the discovery that the brighter member of the wide pair, HD 54236A, is itself an eclipsing binary (EB), comprising two near-equal solar-mass stars on a…
Identification of temperature anomaly RR Lyrae stars in LAMOST survey, misclassification and binarities
Li, Lin-Jia; Qian, Sheng-Bang; Zhu, Li-Ying +2 more
RR Lyrae stars, a well-known type of pulsating variable stars, have been known about for more than a century. A large amount of photometric data on RR Lyrae stars has been accumulated by space- and ground-based sky surveys, but the spectral data are relatively poor. Fortunately, the LAMOST sky survey project provides an opportunity to view them fr…
Open-field Coronal Structures Neighbouring the Sunspot of AR 8535
Vrublevskis, A.; Ryabov, B. I.
We make use of the Potential Field Source Surface (PFSS) model and reveal new details in the strong fields of the dominant sunspot of the active region (AR) 8535. Due to its importance in determining the field line connectivity and topology with resulting consequences for both plasma confinement and dynamics we construct the global magnetic fields…
Spin pairs in the Koronis asteroid family
Carruba, V.; Aljbaae, S.; Martins, B. +4 more
Asteroid groups may either form because of collisions or the rotational failure of a parent body. Collisional asteroid families tend to be more spread in proper element domains, while young spin clusters are usually much more compact. Recently, it has been shown that young spin clusters may form at higher rates in extremely young asteroid families…
The ionosphere of Venus: Strongest control by photo-chemical-equilibrium in the solar system, with implications for exospheric temperatures
Pätzold, M.; Häusler, B.; Tellmann, S. +5 more
Profiles of electron density versus height obtained by the radio occultation experiment on Venus Express provide an observational data base suitable for semi-empirical modeling. The basic equations of photo-chemical-equilibrium (PCE) theory can be applied to the altitude range 100-170 km of Venus' ionosphere (Peter et al., 2014). Within that domai…