The fastest unbound star in our Galaxy ejected by a thermonuclear supernova

被引：100

作者：

Geier, S. ^{[1
,2
,3
]}

Fuerst, F. ^{[4
]}

Ziegerer, E. ^{[2
,3
]}

Kupfer, T. ^{[5
]}

Heber, U. ^{[2
,3
]}

Irrgang, A. ^{[2
,3
]}

Wang, B. ^{[6
]}

Liu, Z. ^{[6
,7
]}

Han, Z. ^{[6
]}

Sesar, B. ^{[8
,9
]}

Levitan, D. ^{[8
]}

Kotak, R. ^{[10
]}

Magnier, E. ^{[11
]}

Smith, K. ^{[10
]}

Burgett, W. S. ^{[11
]}

Chambers, K. ^{[9
]}

Flewelling, H. ^{[9
]}

Kaiser, N. ^{[9
]}

Wainscoat, R. ^{[9
]}

Waters, C. ^{[11
]}

机构：

[1] European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[2] Univ Erlangen Nurnberg, Dr Karl Remeis Observ, D-96049 Bamberg, Germany

[3] Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Astron Inst, D-96049 Bamberg, Germany

[4] CALTECH, Space Radiat Lab, Pasadena, CA 91125 USA

[5] Radboud Univ Nijmegen, Dept Astrophys, Inst Math Astrophys & Particle Phys, NL-6500 GL Nijmegen, Netherlands

[6] Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China

[7] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany

[8] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[9] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[10] Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland

[11] Univ Hawaii Manoa, Inst Astron, Honolulu, HI 96822 USA

来源：

SCIENCE | 2015年 / 347卷 / 6226期

基金：

美国国家科学基金会;

关键词：

SUBDWARF-B-STARS; SINGLE-DEGENERATE SCENARIO; HYPERVELOCITY STARS; IA SUPERNOVAE; ROTATIONAL PROPERTIES; GALACTIC HALO; WHITE-DWARFS; BLACK-HOLES; BINARY; PROGENITORS;

D O I：

10.1126/science.1259063

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Hypervelocity stars (HVSs) travel with velocities so high that they exceed the escape velocity of the Galaxy. Several acceleration mechanisms have been discussed. Only one HVS (US 708, HVS 2) is a compact helium star. Here we present a spectroscopic and kinematic analysis of US 708. Traveling with a velocity of similar to 1200 kilometers per second, it is the fastest unbound star in our Galaxy. In reconstructing its trajectory, the Galactic center becomes very unlikely as an origin, which is hardly consistent with the most favored ejection mechanism for the other HVSs. Furthermore, we detected that US 708 is a fast rotator. According to our binary evolution model, it was spun-up by tidal interaction in a close binary and is likely to be the ejected donor remnant of a thermonuclear supernova.

引用

页码：1126 / 1128

页数：3

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