A Study on White Dwarf Masses in Cataclysmic Variables Based on XMM-Newton and Suzaku Observations

作     者：Zhuo-Li Yu Xiao-Jie Xu Xiang-Dong Li Zhuo-Li Yu;Xiao-Jie Xu;Xiang-Dong Li

作者机构：School of Astronomy and Space Science and Key Laboratory of Modern Astronomy and AstrophysicsNanjing UniversityNanjing210093China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2022年第22卷第4期

页      面：21-35页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China through Grant 11873029 the National Key Research and Development Program of China(2016YFA0400803 and 2017YFA0402703) 

主　　题：(stars:)binaries(including multiple):close (stars:)novae cataclysmic variables X-rays:binaries 

摘      要：The distribution of the mass of white dwarfs(WDs)is one of the fundamental questions in the field of cataclysmic variables(CVs).In this work,we make a systematical investigation on the WD masses in two subclass of CVs:intermediate polars(IPs)and non-magnetic CVs in the solar vicinity based on the fiux ratios of Fe XXVI-Lyαto Fe XXV-Heαemission lines(I_(7.0)/I_(6.7))from archival XMM-Newton and Suzaku *** first verify the(semi-empirical)relations between I_(7.0)/I_(6.7),the maximum emission temperature(T_(max))and the WD mass(M_(WD))with the mkcfiow model based on the apec description and the latest Atom *** then introduce a new spectral model to measure M_(WD)directly based on the above relations.A comparison shows that the derived M_(WD)is consistent with dynamically measured ***,we obtain the average WD masses of 58 CVs(including 36IPs and 22 non-magnetic CVs),which is the largest X-ray selected *** average WD masses are=0.81±0.21 M☉and=0.81±0.21M☉ for IPs and non-magnetic CVs,*** results are consistent with previous works.