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BSN: The First Photometric Analysis of Contact Binary Systems V1961 Cyg and V0890 Lyr

Research in Astronomy and Astrophysics 2024年第12期24卷 127-139页

作者： Sabrina Baudart Atila Poro Double Stars Committee SociétéAstronomique de France LUX Observatoire de ParisCNRSPSL

We presented the first photometric analysis of the V1961 Cyg and V0890 Lyr binary *** observed and analyzed these systems at an observatory in France as part of the Binary Systems of South and North （BSN）*** extracted and collected the times of minima from the observations and literature and presented a new ephemeris for each *** to the few observations about these systems over the years,both O–C diagrams were fitted *** PHysics Of Eclipsing BinariEs （PHOEBE） Python code and the Markov Chain Monte Carlo （MCMC） method were used for light curve *** light curve solution required a cold starspot on the hotter component in the V1961 Cyg binary *** compared and have close agreements between our mass ratios’results from the light curve analysis processes and a new method based on the light curve *** estimated the absolute parameters using an empirical relationship between the semimajor axis and orbital period for contact binary *** results show V1961 Cyg and V0890 Lyr are W-type contact binary *** displayed stars and systems’positions in the M–L,M–R,and logMtot-log *** also presented a new relationship between mass ratio and luminosity ratio.

关键词： (stars:) binaries: eclipsing methods: observational stars: individual (V1961 Cyg, V0890 Lyr)

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A Real-time Monitor for TeV Gamma-Ray Flare with the LHAASO-WCDA Detector

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Research in Astronomy and Astrophysics 2024年第12期24卷 221-230页

作者： G.M.Xiang M.Zha J.N.Zhou Y.Xing Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences

With its high duty cycle, wide field of view and high detection sensitivity, Water Chereknov Detector Array as one of sub-arrays of Large High Altitude Air Shower Observatory is a promising facility to monitor transient phenomena in the very high energy gamma-ray band. In this work, a real-time monitor for selected TeV extragalactic sources is introduced, this flare monitor is developed to detect very high energy flare events and for further studying the power-providing mechanism of blazar relativistic jets. The detailed information such as the searching method and sensitivity of this real-time flare monitor is also presented. In the end, successful multiwavelength and multi-messenger observation of 1ES 1959+650 and IC 310 also confirms the capabilities and reliability of the monitoring system.

关键词： methods: data analysis methods: observational gamma-rays: galaxies

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