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V752 Cen - a triple-lined spectroscopic contact binary with sudden and continuous period changes
Zhou, X.; Qian, S. -B.; Fernández Lajús, E. +1 more
V752 Cen is a triple-lined spectroscopic contact binary. Its multicolour light curves were obtained in the years 1971 and 2018, independently. Photometric analyses reveal that the two sets of light curves produce almost consistent results. It contains a W-subtype totally eclipsing binary, and its mass ratio and fill-out factor are q = 3.35(1) and …
XMM-Newton observations of the symbiotic recurrent nova T CrB: evolution of X-ray emission during the active phase
Zhekov, Svetozar A.; Tomov, Toma V.
We present an analysis of the XMM-Newton observations of the symbiotic recurrent nova T CrB, obtained during its active phase which started in 2014-2015. The XMM-Newton spectra of T CrB have two prominent components: a soft one (0.2-0.6 keV), well represented by blackbody emission, and a heavily absorbed hard component (2-10 keV), well matched by …
Does AGN fraction depend on redshift or luminosity? An extinction-free test by 18-band near- to mid-infrared SED fitting in the AKARI NEP wide field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +3 more
Revealing what fraction of galaxies harbor active galactic nuclei (AGNs) is central to understanding the black hole accretion history of the universe. However, optical and soft X-ray surveys miss the most highly obscured AGNs. Infrared (IR), instead, is more robust against absorption. Previous IR photometric surveys, however, only had four or five…
Strong Gravitational Lensing by Wave Dark Matter Halos
Gonzalez-Morales, Alma X.; Herrera-Martín, Antonio; Hendry, Martin +1 more
Wave dark matter (WaveDM) has recently gained attention as a viable candidate to account for the dark matter content of the universe. In this paper we explore the extent to which, and under what conditions, dark matter halos in this model are able to reproduce strong-lensing systems. First, we explore analytically the lensing properties of the mod…
Studying the Evolution of Warm Dust Encircling BD +20 307 Using SOFIA
Stark, Christopher C.; Weinberger, Alycia J.; Thompson, Maggie A. +2 more
The small class of known stars with unusually warm, dusty debris disks is a key sample to probe in order to understand cascade models and the extreme collisions that likely lead to the final configurations of planetary systems. Because of its extreme dustiness and small radius, the disk of BD +20 307 has a short predicted collision time and is the…
What information can we derive from historical Far Eastern guest stars for modern research on novae and cataclysmic variables?
Hoffmann, Susanne M.
Recently, there have been several studies on the evolution of binary systems using historical data that are treated as facts in the chain of argument. This paper discusses six case studies of modern dwarf novae with suggested historical counterparts from the historical point of view, as well as the derived consequences for the physics of close bin…
The study of unclassified B[e] stars and candidates in the Galaxy and Magellanic Clouds†
Borges Fernandes, M.; Condori, C. A. H.; Kraus, M. +2 more
We investigated 12 unclassified B[e] stars or candidates, 8 from the Galaxy, 2 from the Large Magellanic Cloud (LMC), and 2 from the Small Magellanic Cloud (SMC). Based on the analysis of high-resolution spectroscopic (FEROS) and photometric data, we confirmed the presence of the B[e] phenomenon for all objects of our sample, except for one (IRAS …
Thermal Emission in the Southwest Clump of VY CMa
Humphreys, Roberta M.; Stone, Jordan; Ertel, Steve +6 more
We present high spatial resolution LBTI/NOMIC 9-12 µm images of VY CMa and its massive outflow feature, the Southwest (SW) Clump. Combined with high-resolution imaging from the Hubble Space Telescope (0.4-1 µm) and LBT/LMIRCam (1-5µm), we isolate the spectral energy distribution (SED) of the clump from the star itself. Using radi…
Testing Efficiency of Empirical, Adaptive, and Global MHD Magnetospheric Models to Represent the Geomagnetic Field in a Variety of Conditions
Sergeev, V. A.; Zheng, Y.; Tsyganenko, N. A. +1 more
We used data for eight magnetospheric spacecraft providing magnetic observations in various magnetospheric domains during a six-day time period, including the June 2015 storm, and a five-day period including the March 2015 storm. For these time intervals, containing different solar wind regimes and different activity levels, we used three types of…
Measurements of the Cross-spectra of the Cosmic Infrared and Microwave Backgrounds from 95 to 1200 GHz
Bock, J.; Bleem, L. E.; Stark, A. A. +40 more
We present measurements of the power spectra of cosmic infrared background (CIB) and cosmic microwave background (CMB) fluctuations in six frequency bands. Maps at the lower three frequency bands, 95, 150, and 220 GHz (3330, 2000, and 1360 µm) are from the South Pole Telescope, while the upper three frequency bands, 600, 857, and 1200 GHz (5…