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New results for FBS late-type stars using Gaia EDR3 data
Lebzelter, T.; Gigoyan, K. K.; Kostandyan, G. R. +3 more
We study in this paper bright late-type giants found in the First Byurakan Survey (FBS) data base. Phase dependent light-curves from large sky area variability data bases such as Catalina Sky Survey (CSS) and All-Sky Automated Survey for Supernovae (ASAS-SN), and the early installment of the third Gaia data release (Gaia EDR3) photometric and astr…
Long-term Evolution of the Short-term X-Ray Variability of the Jetted TDE Swift J1644+57
Jin, Chichuan
The short-term X-ray variability of tidal disruption events (TDEs) and its similarities with that of active galactic nuclei are poorly understood. In this work, we show the diversity of TDEs' short-term X-ray variability, and take Swift J1644+57 as an example to study the evolution of various properties related to the short-term X-ray variability,…
GLACE survey: Galaxy activity in ZwCl0024+1652 cluster from strong optical emission lines
Sánchez-Portal, Miguel; Pintos-Castro, Irene; Beyoro-Amado, Zeleke +9 more
Although ZwCl0024+1652 galaxy cluster at z ∼ 0.4 has been thoroughly analysed, it lacks a comprehensive study of star formation and nuclear activity of its members. With GaLAxy Cluster Evolution (GLACE) survey, a total of 174 H α emission-line galaxies (ELGs) were detected, most of them having [N II]. We reduced and analysed a set of [O III] and H…
Deciphering the 3D Orion Nebula-IV: The HH 269 Flow Emerges from the Orion-S Embedded Molecular Cloud
Abel, N. P.; O'Dell, C. R.; Ferland, G. J.
We have extended the membership and determined the 3D structure of the large (0.19 pc) HH 269 sequence of shocks in the Orion Nebula. All of the components lie along a track that is highly tilted to the plane of the sky and emerge from within the Orion-S embedded molecular cloud. Their source is probably either the highly obscured mm 9 source asso…
Modeling the Hα Emission Surrounding Spica Using the Lyman Continuum from a Gravity-darkened Central Star
Aufdenberg, Jason P.; Hammill, Joseph M.
The large, faint Hα emission surrounding the early B-star binary Spica has been used to constrain the total hydrogen recombination rate of the nebula and indirectly probe the Lyman continuum luminosity of the primary star. Early analysis suggested that a stellar atmosphere model, consistent with Spica A's spectral type, has a Lyman continuum lumin…
Spatial distributions and origin of hydrated sulfate minerals at the mineral bowl in Ophir Chasma, Mars
Li, Bo; Qiao, Le; Ling, Zongcheng +9 more
Numerous occurrences of hydrated minerals (e.g., phyllosilicate, sulfate) have been found on the surface of Mars by remote sensing and in-situ exploration missions, providing strong evidence of the aqueous environment in Martian history. However, the detailed origin of these hydrated minerals is often controversial, reducing their usefulness in co…
The structure of the IRAS05168+3634 star-forming region
Nikoghosyan, E. H.; Azatyan, N. M.; Andreasyan, D. H. +1 more
This study aims to determine the main physical parameters (N(H2) hydrogen column density and Td dust temperature) of the Interstellar medium, and their distribution in the extended star-forming region, which includes IRAS 05156+3643, 05162+3639, 05168+3634, 05177+3636, and 05184+3635 sources. We also provide a comparative ana…
Spectral evolution of X-ray pulsar 4U 1901+03 during the 2019 outburst based on Insight-HXMT and NuSTAR observations
Zhang, Shu; Doroshenko, Victor; Tsygankov, Sergey S. +7 more
We report on a detailed spectral analysis of emission from X-ray pulsar 4U 1901+03 using data obtained by the Insight-HXMT and NuSTAR observatories during the 2019 outburst of the source. Thanks to the extensive coverage of the outburst by Insight-HXMT, we were able to investigate the spectral evolution of the source as a function of flux, and com…
Variations in the Correlations of Acceleration and Force of Slow and Fast CMEs with Solar Activity during Solar Cycles 23 - 24
Du, Zhanle
Studying the behavior of coronal mass ejections (CMEs) is important for both solar physics and space weather. The correlations of smoothed monthly mean daily integrated CME acceleration [a ], mass [M ], and the force [M a ] to drive CMEs with sunspot activity [RI] are analyzed for both slow and fast CMEs and for both Solar Cycles 23 and…
The effect of continuum elimination in identifying circumstellar dust around Mira
Speck, Angela K.; Shepard, Lisa M.
Asymptotic giant branch (AGB) stars are major contributors of cosmic dust to the universe. Typically, dust around AGB stars is investigated via radiative transfer (RT) modelling, or via simple deconstruction of observed spectra. However, methodologies applied vary. Using archival spectroscopic, photometric, and temporal data for the archetypal dus…