Optical spectroscopy of candidate Alpha Persei white dwarfs

Optical spectroscopy of candidate Alpha Persei white dwarfs
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候选英仙座阿尔法白矮星的光谱

DOI:
10.1093/mnras/stv1280
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发表时间:
2015
影响因子:
4.8
通讯作者:
Casewell S
Casewell S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Casewell S

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作为对初始质量-最终质量关系的高质量一端的调查的一部分,我们对附近(172.4 pc)年轻(80-90迈)α英仙座疏散星团的新白矮星成员进行了搜索。利用英国红外望远镜(UKIRT)红外深空巡天和超宇宙巡天进行的光度和天体测量研究发现了14颗新的白矮星候选者。我们利用威廉赫歇尔望远镜获得了最亮的11颗候选恒星的中分辨率光谱,证实其中7颗是DA白矮星,3颗是DB白矮星,1颗是sdOB恒星,只有3颗在星团年龄范围内具有冷却年龄,从它们在初始质量-最终质量关系上的位置来看,它们很可能都不是星团成员。这个结果令人失望,因为最近对星团质量函数的研究表明,即使在如此年轻的年龄,也至少应该有一个白矮星成员。α Per的任何白矮星成员都可能隐藏在双星系统中,就像毕宿星团中的情况一样,然而,星团中缺乏大质量恒星也使这种情况看起来不太可能发生。另一种可能是,在这个银河系纬度上,遗留光学图像调查数据的检测不完整导致一些白矮星成员被忽视了。如果是这样,盖亚会找到他们的。
As part of an investigation into the high-mass end of the initial mass–final mass relation we performed a search for new white dwarf members of the nearby (172.4 pc), young (80–90 Myr) α Persei open star cluster. The photometric and astrometric search using the United Kingdom InfraRed Telescope (UKIRT) Infrared Deep Sky Survey and SuperCOSMOS sky surveys discovered 14 new white dwarf candidates. We have obtained medium resolution optical spectra of the brightest 11 candidates using the William Herschel Telescope and confirmed that while 7 are DA white dwarfs, 3 are DB white dwarfs and 1 is an sdOB star, only three have cooling ages within the cluster age, and from their position on the initial mass–final mass relation, it is likely none are cluster members. This result is disappointing, as recent work on the cluster mass function suggests that there should be at least one white dwarf member, even at this young age. It may be that any white dwarf members of α Per are hidden within binary systems, as is the case in the Hyades cluster, however the lack of high-mass stars within the cluster also makes this seem unlikely. One alternative is that a significant level of detection incompleteness in the legacy optical image survey data at this Galactic latitude has caused some white dwarf members to be overlooked. If this is the case,Gaiawill find them.
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