Photometric Properties and Stellar Parameters of the Rapidly Rotating Magnetic Early-B Star HD 345439  

作　　者：Dong-Xiang Shen Jin-Zhong Liu Chun-Hua Zhu Guo-Liang Lü Yu Zhang Cheng-Long Lü Hao-Zhi Wang Lei Li Xi-Zhen Lu Jin-Long Yu Abdurepqet Rustem 

机构地区：[1]School of Physical Science and Technology,Xinjiang University,Urumqi 830046,China [2]Xinjiang Astronomical Observatory,National Astronomical Observatories,Chinese Academy of Sciences,Urumqi 830000,China

出　　处：《Research in Astronomy and Astrophysics》2023年第1期18-31,共14页天文和天体物理学研究（英文版）

基　　金：the generous support of the Natural Science Foundation of Xinjiang No.2021D01C075;the National Natural Science Foundation of China under grants U2031204,12163005 and 11863005;the science research grants from the China Manned Space Project with Nos.CMS-CSST-2021-A08 and CMS-CSST-2021-A10;the science research grants from National Key R&D Program of China(2022YFE0126200);National Major Scientific Project built by the Chinese Academy of Sciences;provided by the National Development and Reform Commission;provided by the NASA Explorer Program;operated by the Association of Universities for Research in Astronomy,Inc.,under NASA contract NAS 526555。

摘　　要：We first present the multicolor photometry results of the rapidly rotating magnetic star HD 345439 using the Nanshan One-meter Wide-field Telescope.From the photometric observations,we derive a rotational period of 0.7699±0.0014 day.The light curves of HD 345439 are dominated by the double asymmetric S-wave feature that arises from the magnetic clouds.Pulsating behaviors are not observed in Sector 41 of the Transiting Exoplanet Survey Satellite.No evidence is found of the occurrence of centrifugal breakout events neither in the residual flux nor in the systematic variations at the extremum of the light curve.Based on the hypothesis of the Rigidly Rotating Magnetosphere model,we restrict the magnetic obliquity angleβand the rotational inclination angle i so that they satisfy the approximate relationβ+i≈105°.The color excess,extinction,and luminosity are determined to be E_((B-V))=0.745±0.016 mag,A_(V)=2.31±0.05 mag,and log(L/L_(⊙))=3.82±0.1 dex,respectively.Furthermore,we derive the effective temperature as T_(eff)=22±1 kK and the surface gravity as log g=4.00±0.22.The mass M=-7.24_(-1.24)^(+1.75)M_(⊙),radius R=4.44_(-1.93)^(+2.68)R_(⊙),and age τ_(age)=23.62_(-21.97)^(+4.24) Myr are estimated from the Hertzsprung-Russell diagram.

关 键 词：STARS chemically peculiar-stars early-type-stars fundamental parameters-stars magnetic field 

分 类 号：P152[天文地球—天文学]