Gamma Cas Stars as Be plus White Dwarf Binary Systems
文献类型:期刊论文
作者 | Gies, Douglas R.1; Wang LQ(王璐茜)1,2; Klement, Robert3,4 |
刊名 | ASTROPHYSICAL JOURNAL LETTERS |
出版日期 | 2023 |
卷号 | 942期号:1 |
ISSN号 | 2041-8205 |
DOI | 10.3847/2041-8213/acaaa1 |
产权排序 | 第2完成单位 |
文献子类 | Article |
英文摘要 | The origin of the bright and hard X-ray emission flux among the gamma Cas subgroup of B-emission line (Be) stars may be caused by gas accretion onto an orbiting white dwarf (WD) companion. Such Be+WD binaries are the predicted outcome of a second stage of mass transfer from a helium star mass donor to a rapidly rotating mass gainer star. The stripped donor stars become small and hot white dwarfs that are extremely faint compared to their Be star companions. Here we discuss model predictions about the physical and orbital properties of Be+WD binaries, and we show that current observational results on gamma Cas systems are consistent with the expected large binary frequency, companion faintness and small mass, and relatively high mass range of the Be star hosts. We determine that the companions are probably not stripped helium stars (hot subdwarf sdO stars), because these are bright enough to detect in ultraviolet spectroscopy, yet their spectroscopic signatures are not observed in studies of gamma Cas binaries. Interferometry of relatively nearby systems provides the means to detect very faint companions including hot subdwarf and cooler main-sequence stars. Preliminary observations of five gamma Cas binaries with the CHARA Array interferometer show no evidence of the companion flux, leaving white dwarfs as the only viable candidates for the companions. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
WOS关键词 | BLANKETED MODEL ATMOSPHERES ; X-RAY ; NEUTRON-STAR ; MULTIWAVELENGTH CAMPAIGN ; CIRCUMSTELLAR STRUCTURE ; EVOLUTION ; COMPANION ; CASSIOPEIAE ; SINGLE ; NOVAE |
资助项目 | National Science Foundation[AST-1636624] ; National Science Foundation[AST-1908026] ; National Science Foundation[AST-2034336] ; GSU College of Arts and Sciences ; GSU Office of the Vice President for Research and Economic Development ; National Natural Science Foundation of China[12103085] ; National Natural Science Foundation of China[12090040] ; National Natural Science Foundation of China[12090043] ; Association of Universities for Research in Astronomy, Inc., under NASA[NAS 526555] |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP Publishing Ltd |
WOS记录号 | WOS:000905271000001 |
资助机构 | National Science Foundation[AST-1636624, AST-1908026, AST-2034336] ; GSU College of Arts and Sciences ; GSU Office of the Vice President for Research and Economic Development ; National Natural Science Foundation of China[12103085, 12090040, 12090043] ; Association of Universities for Research in Astronomy, Inc., under NASA[NAS 526555] |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25715] |
专题 | 云南天文台_大样本恒星演化研究组 |
通讯作者 | Gies, Douglas R. |
作者单位 | 1.Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P.O. Box 5060, Atlanta, GA 30302-5060, USA; dgies@gsu.edu; 2.Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming 650216, Yunnan, People's Republic of China; 3.The CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA 91023, USA; 4.ESO, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago de Chile, Chile |
推荐引用方式 GB/T 7714 | Gies, Douglas R.,Wang LQ,Klement, Robert. Gamma Cas Stars as Be plus White Dwarf Binary Systems[J]. ASTROPHYSICAL JOURNAL LETTERS,2023,942(1). |
APA | Gies, Douglas R.,Wang LQ,&Klement, Robert.(2023).Gamma Cas Stars as Be plus White Dwarf Binary Systems.ASTROPHYSICAL JOURNAL LETTERS,942(1). |
MLA | Gies, Douglas R.,et al."Gamma Cas Stars as Be plus White Dwarf Binary Systems".ASTROPHYSICAL JOURNAL LETTERS 942.1(2023). |
入库方式: OAI收割
来源:云南天文台
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