The large-scale nebular pattern of a superwind binary in an eccentric orbit

被引：43

作者：

Kim, Hyosun ^{[1
]}

Trejo, Alfonso ^{[1
]}

Liu, Sheng-Yuan ^{[1
]}

Sahai, Raghvendra ^{[2
]}

Taam, Ronald E. ^{[1
,3
]}

Morris, Mark R. ^{[4
]}

Hirano, Naomi ^{[1
]}

Hsieh, I-Ta ^{[1
]}

机构：

[1] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan

[2] CALTECH, Jet Prop Lab, MS 183-900,4800 Oak Grove Dr, Pasadena, CA 91011 USA

[3] Northwestern Univ, Dept Phys & Astron, 2145 Sheridan Rd, Evanston, IL 60208 USA

[4] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

来源：

NATURE ASTRONOMY | 2017年 / 1卷 / 03期

关键词：

PLANETARY-NEBULAE; CENTRAL STARS; HYDRODYNAMICS; SYSTEMS; SAMPLE; RINGS; WIND;

D O I：

10.1038/s41550-017-0060

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Preplanetary nebulae and planetary nebulae are evolved, mass-losing stellar objects that show a wide variety of morphologies. Many of these nebulae consist of outer structures that are nearly spherical (spiral/shell/arc/halo) and inner structures that are highly asymmetric (bipolar/multipolar)(1,2). The coexistence of such geometrically distinct structures is enigmatic because it hints at the simultaneous presence of both wide and close binary interactions, a phenomenon that has been attributed to stellar binary systems with eccentric orbits(3). Here, we report high-resolution molecular line observations of the circumstellar spiral-shell pattern of AFGL 3068, an asymptotic giant branch star transitioning to the preplanetary nebula phase. The observations clearly reveal that the dynamics of the mass loss is influenced by the presence of an eccentric-orbit binary. This quintessential object opens a window on the nature of deeply embedded binary stars through the circumstellar spiral-shell patterns that reside at distances of several thousand au from the stars.

引用

页数：5

共 34 条

[11] HIGH-RESOLUTION CO OBSERVATION OF THE CARBON STAR CIT 6 REVEALING THE SPIRAL STRUCTURE AND A NASCENT BIPOLAR OUTFLOW [J].