论文标题
发现热超大快速旋转的DBA白矮人
Discovery of a hot ultramassive rapidly rotating DBA White Dwarf
论文作者
论文摘要
我们报告发现附近有He-H气氛的大型白色矮人。白矮人的位置为$ 74.5 \ pm0.9 $ PC。它的半径，质量，有效温度，H/H/H/H/HE年龄为$ r = 2500 \ pm100 $ km，$ m = 1.33 \ pm0.01 $ $ $ $ \ rm m _ {\ odot} $，$ t _ {\ t_ {\ mathrm {eff}}} $ 330 \ PM40 $ MYR。观察到的频谱由$ v _ {\ mathrm {r}} =+240 \ pm15 $ km s $ s $^{ - 1}，$重新缩短。白色矮人显示了常规的稳定光度变异性，幅度$ΔG\ ot of0.06^{\ mathrm {m}} $ and ofend $ p = 353.456 $ s暗示快速旋转。这种巨大的，炎热且迅速旋转的白矮人可能源自近距离二元白色矮人系统的合并，该系统在地球历史的炭火化时期避免了热核类型IA Supernova中的爆炸。
We report the discovery of a nearby massive white dwarf with He-H atmosphere. The white dwarf is located at a distance of $74.5\pm0.9$ pc. Its radius, mass, effective temperature, H/He ratio and age are $R=2500\pm100$ km, $M=1.33\pm0.01$ $\rm M_{\odot}$, $T_{\mathrm{eff}}=31200\pm 1200$ K, ${\mathrm{H/He}}\sim0.1$ and $330\pm40$ Myr, respectively. The observed spectrum is redshifted by $V_{\mathrm{r}}=+240\pm15$ km s$^{-1},$ which is mostly attributed to the gravitational redshift. The white dwarf shows a regular stable photometric variability with amplitude $Δg\approx0.06^{\mathrm{m}}$ and period $P=353.456$ s suggesting rapid rotation. This massive, hot and rapidly rotating white dwarf is likely to originate from the merging of close binary white dwarf system that avoided explosion in a thermonuclear type Ia supernova at the Carboniferous Period of the Earth history.
