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

页码：L21 / L25

页数：5

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