Discovery of a hot ultramassive rapidly rotating DBA white dwarf

被引：33
作者：
Pshirkov, M. S. [1 ,2 ]
Dodin, A., V [1 ]
Belinski, A. A. [1 ]
Zheltoukhov, S. G. [1 ,3 ]
Fedoteva, A. A. [1 ,3 ]
Voziakova, O. V. [1 ,4 ]
Potanin, S. A. [1 ,3 ]
Blinnikov, S., I [1 ,5 ]
Postnov, K. A. [1 ,5 ]
机构：
[1] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, 13 Univ Skij Pr, Moscow 119234, Russia
[2] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
[3] Moscow MV Lomonosov State Univ, Fac Phys, Leninskie Gory 1, Moscow 119991, Russia
[4] Russian Acad Sci, Crimean Astrophys Observ, UA-298409 Nauchnyi, Crimea, Ukraine
[5] ITEP, Bol Cheremushkinskaya 25, Moscow 117218, Russia
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 499卷 / 01期
基金：
俄罗斯科学基金会;
关键词：
white dwarfs; ultraviolet: stars; EVOLUTION; PROGENITORS; STARS; FATE;
D O I：
10.1093/mnrasl/slaa149
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 +/- 0.9 pc. Its radius, mass, effective temperature, H/He ratio, and age are R = 2500 +/- 100 km, M = 1.33 +/- 0.01M(circle dot), T-eff = 31 200 +/- 1200 K, H/He similar to 0.1, and 330 +/- 40 Myr, respectively. The observed spectrum is redshifted by V-r =+240 +/- 15 km s(-1), which is mostly attributed to the gravitational redshift. The white dwarf shows a regular stable photometric variability with amplitude Delta g approximate to 0.06(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.
引用
收藏
页码：L21 / L25
页数：5
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