arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1702.04419astro-ph.HEastro-ph.SR
收藏

大质量白矮星的分布及其对吸积坍缩的意义

On the Distribution of Massive White Dwarfs and its Implication for Accretion-Induced Collapse

Ali Taani

摘要:

白矮星(WD)和主序星的伴星可能在不同的恒星演化阶段相互作用。这种二元人口在历史上帮助我们提高了我们对二元形成和演化情景的理解。用于分析的数据集由斯隆数字巡天(SDSS)获得的115个测量良好的WD质量组成。这些系统中有相当一部分可能会演化并达到克拉塞卡极限,然后经历一次吸积引发的坍塌(AIC),产生毫秒级的黑洞(MSP)。我的注意力主要集中在大质量的WD(M_WD > 1M_sun),这是能够进一步增长的质量转移阶段的恒星双星系统,以达到Ekrasekhar质量。平均值为1.15 +/-0.2M_sun。在AIC流程的框架内,此类系统被认为是生产MSP的良好候选者。这里提出的结果,我们的理解二进制MSP演变的影响进行了讨论。作为我工作的一个副产品,我在银河系坐标模式中提供了所有已知恒星的最新分布。关键词:恒星;中子星;白矮星; X射线双星;基本参数。

英文摘要:

A White Dwarf (WD) star and a main-sequence companion may interact through their different stellar evolution stages. This sort of binary population has historically helped us improve our understanding of binary formation and evolution scenarios. The data set used for the analysis consists of 115 well-measured WD masses obtained by the Sloan Digital Sky Survey (SDSS). A substantial fraction of these systems could potentially evolve and reach the Chandrasekhar limit, and then undergo an Accretion-Induced Collapse (AIC) to produce millisecond pulsars (MSPs). I focus my attention mainly on the massive WDs (M_WD > 1M_sun), that are able to grow further by mass-transfer phase in stellar binary systems to reach the Chandrasekhar mass. A mean value of M ~ 1.15 +/- 0.2M_sun is being derived. In the framework of the AIC process, such systems are considered to be good candidates for the production of MSPs. The implications of the results presented here to our understanding of binary MSPs evolution are discussed. As a by-product of my work, I present an updated distribution of all known pulsars in Galactic coordinates pattern. Keywords: Stars; Neutron stars; White dwarfs; X-ray binaries; Fundamental parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑