HS 0146+1847 : a DAZB white dwarf of very unusual composition
HS 0146+1847 : a DAZB white dwarf of very unusual composition
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HS 0146 1847：一颗成分非常不寻常的 DAZB 白矮星
DOI：
10.1051/0004-6361:20053058
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发表时间：
2005
影响因子：
6.5
通讯作者：
D. Reimers
中科院分区：
文献类型：
--
作者：
D. Koester;R. Napiwotzki;B. Voss;D. Homeier;D. Reimers
HS 0146+1847，最初在自行巡天中被确认为白色矮星候选者，在汉堡类星体巡天中被重新发现。ESO超新星始祖巡天（SPY）获得的光谱显示出强烈的巴耳末线和Call线，表明它被归类为DAZ白色矮星。HS 0146+1847在T eff = 11 500 K时有一个富氦的大气层。这是由非常弱的He线证实的，将分类改为DAZB。还检测到Mg和Fe线。我们讨论了中性氦加宽巴耳末谱线的物理过程，给出了谱分析，并指出了冷白色矮星中重元素吸积/扩散的一些意义。
HS 0146+1847, originally identified as a white dwarf candidate in proper motion surveys, was rediscovered as a candidate in the Hamburg Quasar Survey. Spectra obtained for the SPY (ESO Supernova la Progenitor) survey show strong Balmer and Call lines, suggesting a classification as DAZ white dwarf. Contrary to the objects known so far in this class, HS 0146+1847 has a helium-rich atmosphere at T eff = 11 500 K. This is confirmed by very weak He lines, changing the classification to DAZB. Mg and Fe lines are also detected. We discuss the physics of Balmer line broadening by neutral helium, present a spectral analysis and note some implications for the accretion/diffusion scenario of heavy elements in cool white dwarfs.