Spiral-shells and nascent bipolar outflow in CIT 6: hints for an eccentric-orbit binary?

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Kim, Hyosun^1,2 ; Liu, Sheng-Yuan^1 ; Hirano, Naomi^1 ; Zhao-Geisler, Ronny^1,3 ; Trejo, Alfonso^1 ; Yen, Hsi-Wei^1 ; Taam, Ronald E.^1 ; Kemper, Francisca^1 ; Kim, Jongsoo^2 ; Byun, Do-Young^2 ; Liu, Tie^2

Academia Sinica Institute of Astronomy and Astrophysics, Taiwan^1

Korea Astronomy and Space Science Institute, Korea, Republic of^2

National Taiwan Normal University, Department of Earth Sciences, Taiwan^3

关键词: Binary systems;    Carbon stars;    Circumstellar envelopes;    CO line;    Eccentric orbits;    High resolution;    Spiral shells;    Submillimeter array;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/7/072018/pdf
DOI  :  10.1088/1742-6596/728/7/072018

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We present the essential results pointed out in a recently published paper, Kim et al. 2015, Astrophys. J., 814, 61. The carbon star CIT 6 reveals evidences for a binary in a high-resolution CO line emission map of its circumstellar envelope taken with the Submillimeter Array. The morphology of the outflow described by the spiral-shell pattern, bipolar (or possibly multipolar) outflow, one-sided interarm gaps, and double spiral feature point to a plausible scenario that CIT 6 is a binary system in an eccentric orbit with the mass losing star evolving from the AGB.