Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary

Accurate mass and radius determinations of a cool subdwarf in an eclipsing binary
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食双星中冷亚矮星的精确质量和半径测定

DOI:
10.1038/s41550-019-0746-7
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发表时间:
2019-03
期刊:
影响因子:
14.1
通讯作者:
Santiago Torres
Santiago Torres
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Rebassa-Mansergas Alberto;Steven G. Parsons;Vikram S. Dhillon;Juanjuan Ren;Stuart P. Littlefair;Thomas R. Marsh;Santiago Torres

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冷亚矮星是在银河系演化的早期阶段形成的贫金属低质量恒星。因为它们在太阳附近相对罕见,所以我们知道太阳附近很少有冷亚矮星,而且没有一个质量和半径都能被准确确定。这阻碍了我们对主序带低质量端恒星的理解。在这里,我们报告了 SDSSJ235524.29+044855.7 的发现,它是一个食双星,包含一颗冷亚矮星和一颗白矮星伴星。根据双星的光变曲线和径向速度曲线,我们确定了冷亚矮星的质量和半径,并通过分析其光谱能量分布得出其有效温度和光度。我们的结果验证了低质量、低金属丰度恒星的质量、半径、有效温度和光度之间的理论关系。
Cool subdwarfs are metal-poor low-mass stars that formed during the early stages of the evolution of our Galaxy. Because they are relatively rare in the vicinity of the Sun, we know of few cool subdwarfs in the solar neighbourhood, and none for which both the mass and the radius are accurately determined. This hampers our understanding of stars at the low-mass end of the main sequence. Here we report the discovery of SDSSJ235524.29+044855.7 as an eclipsing binary containing a cool subdwarf star, with a white dwarf companion. From the light curve and the radial-velocity curve of the binary we determine the mass and the radius of the cool subdwarf and we derive its effective temperature and luminosity by analysing its spectral energy distribution. Our results validate the theoretical relations between mass, radius, effective temperature and luminosity for low-mass, low-metallicity stars.
具有氦和氧核心的低质量白矮星的全面演化
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