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arXiv 2008.05962astro-ph.SRastro-ph.GA
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天龙座C1共生双星的几何结构

Geometry of the Draco C1 Symbiotic Binary

Hannah M. Lewis, Borja Anguiano, Keivan G. Stassun, Steven R. Majewski, Phil Arras, Craig L. Sarazin, Zhi-Yun Li, Nathan De Lee, Nicholas W. Troup, Carlos Allen… 展开作者

Hannah M. Lewis, Borja Anguiano, Keivan G. Stassun, Steven R. Majewski, Phil Arras, Craig L. Sarazin, Zhi-Yun Li, Nathan De Lee, Nicholas W. Troup, Carlos Allende Prieto, Carles Badenes, Katia Cunha, D. A. Garcia-Hernandez, David L. Nidever, Pedro A. Palicio, Joshua D. Simon, Verne V. Smith

摘要:

天龙座C1是一个已知的共生双星系统,由一颗碳红巨星和一颗炽热的致密伴星组成--可能是一颗白矮星--属于天龙座矮球状星系。从近红外光谱观测的阿帕奇点天文台星系演化实验(APOGEE-2),斯隆数字巡天IV的一部分,我们提供更新的恒星参数的冷,巨大的组件,并限制温度和质量的热,紧凑的同伴。以前对该系统周期性的测量仅基于几个历元的径向速度数据或相对较短的基线光度观测,仅足以对轨道周期设定下限($P > 300$天)。我们第一次报告了双星系统的精确轨道参数:通过从APOGEE跨越3年多的观测基线的43次径向速度测量,我们明确地推导出该系统的周期为$1220.0^{+3.7}_{-3.5}$天。基于新推导出的轨道周期和系统的分离,以及对红巨星半径的估计,我们发现热伴星必须从其演化伴星的稠密风中吸积物质。

英文摘要:

Draco C1 is a known symbiotic binary star system composed of a carbon red giant and a hot, compact companion -- likely a white dwarf -- belonging to the Draco dwarf spheroidal galaxy. From near-infrared spectroscopic observations taken by the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2), part of Sloan Digital Sky Survey IV, we provide updated stellar parameters for the cool, giant component, and constrain the temperature and mass of the hot, compact companion. Prior measurements of the periodicity of the system, based on only a few epochs of radial velocity data or relatively short baseline photometric observations, were sufficient only to place lower limits on the orbital period ($P > 300$ days). For the first time, we report precise orbital parameters for the binary system: With 43 radial velocity measurements from APOGEE spanning an observational baseline of more than 3 years, we definitively derive the period of the system to be $1220.0^{+3.7}_{-3.5}$ days. Based on the newly derived orbital period and separation of the system, together with estimates of the radius of the red giant star, we find that the hot companion must be accreting matter from the dense wind of its evolved companion.

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。

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