摘要
Black widows(BWs)are millisecond pulsars ablating their companion stars.The out-flowing material from the companion can block the radio emission of the pulsar,resulting in eclipses.In this paper,we construct a model for the radio eclipse by calculating the geometry of the bow shock between the winds of the pulsar and companion,where the shock shapes the eclipsing medium but had not been described in detail in previous works.The model is further used to explain the variations of the flux density and dispersion measure of three BW pulsars(i.e.,PSR B1957+20,J2055+3829,and J2051-0827)detected by the Five-hundred-meter Aperture Spherical radio Telescope.Consequently,we constrained the parameters of the three BW systems such as the inclination angles and true anomalies of the observer as well as the mass-loss rates and wind velocity of the companion stars.With the help of these constraints,it is expected that magnetic fields of companion stars and even masses of pulsars could further be determined as some extra observation can be achieved in the future.
作者
杜泽昕
俞云伟
A-Ming Chen
王双强
周霞
郑小平
Ze-Xin Du;Yun-Wei Yu;A-Ming Chen;Shuang-Qiang Wang;Xia Zhou;Xiao-Ping Zheng(Institute of Astrophysics,Central China Normal University,Wuhan 430079,China;Key Laboratory of Quark and Lepton Physics,Central China Normal University,Ministry of Education,Wuhan 430079,China;Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 201210,China;Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China;Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Nanjing 210008,China;Xinjiang Key Laboratory of Radio Astrophysics,Urumqi 830011,China)
基金
supported by the National SKA program of China(2020SKA0120300)
the National Key R&D Program of China(2021YFA0718500)
the National Natural Science Foundation of China(grant Nos.11833003,12033001)
the China Postdoctoral Science Foundation(No.2023T160410)
the Opening Foundation of Xinjiang Key Laboratory(No.2021D04016)。
