Evidence for very nearby hidden white dwarfs

Evidence for very nearby hidden white dwarfs
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附近隐藏着白矮星的证据

DOI:
10.1093/mnras/stw760
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发表时间:
2016
影响因子:
4.8
通讯作者:
Lachaume R.
Lachaume R.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fuhrmann K;Chini R;Kaderhandt L;Chen Z;Lachaume R.

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我们向突出的和附近的(d=14pc)视觉双星αFornacis报告了第三组分的发现。这一新的不可见部件是一个4维短周期的Ba-BB子系统的一部分,它的K型α对大熊座主星显示出惊人的[BA/Fe]=+0.26Dex过剩,而对于它遥远的可视伴星α,它的接近太阳的[BA/Fe]=+0.04Dex丰度。对于更近的(d=8pc)多星ξ、大熊座及其类似的4-d BA-BB子系统,我们同样发现其G型ξ-Uma-BA主星的[BA/Fe]=+0.37Dex。与视觉伴星ξ的[BA/Fe]=+0.12Dex相比,在这两个例子中,不同的Ba2丰度分别是短周期白矮星系统和通过质量转移和风吸积产生蓝散星的直接证据,对于它们的亲密和遥远的同伴来说。这些发现还意味着,αFor和ξ-Uma的传统恒星年龄测定可能都不可靠。
We report the discovery of a tertiary component to the prominent and nearby (d= 14 pc) visual binary α Fornacis. The new invisible component is part of a 4-d short-period Ba-Bb subsystem, whose K-type α For Ba primary shows a striking [Ba/Fe] = +0.26 dex overabundance, at variance with a close to solar [Ba/Fe] = +0.04 dex abundance for its distant visual companion α For A. For the even nearer (d= 8 pc) multiple star ξ Ursae Majoris and its alike 4-d Ba-Bb subsystem, we similarly find [Ba/Fe] = +0.37 dex for its G-type ξ UMa Ba primary, compared to a significantly lower [Ba/Fe] = +0.12 dex for the visual companion ξ UMa A. In both cases, the differential barium enrichment is direct evidence for short-period white dwarf systems and the creation of blue straggler stars through mass transfer and wind accretion, for their close and distant companions, respectively. These findings also imply that conventional stellar age datings for both α For and ξ UMa are likely not reliable.
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