Morphology and kinematics of the gas envelope of the Mira binary W Aquilae  

作　　者：Do Thi Hoai Pham Tuyet Nhung Pham Ngoc Diep Nguyen Thi Phuong Pham Tuan-Anh Nguyen Thi Thao Pierre Darriulat 

机构地区：[1]Department of Astrophysics, Vietnam National Satellite Center,VAST

出　　处：《Research in Astronomy and Astrophysics》2016年第7期47-54,共8页天文和天体物理学研究（英文版）

基　　金：the ALMA partnership,who are making their data available to the public after a one year period of exclusive property,an initiative that means invaluable support and encouragement for Vietnamese astrophysics;support from the staff of the ALMA Helpdesk;acknowledged from the Vietnam National Satellite Center(VNSC/VAST);the NAFOSTED funding agency,the World Laboratory,the Odon Vallet Foundation and the Rencontres du Viet Nam

摘　　要：We analyse ALMA observations of the12CO（3-2） emission of the circumstellar envelope（CSE）of the Mira variable binary star W Aql. These provide, for the first time, spatially resolved Doppler velocity spectra of the CSE up to angular distances to the central star ofy nature of the observations（only five minutes in each of～5′′（meaning some 2000 AU）. The explorator two different configurations） does not allow for a detailed modelling of the properties of the CSE but provides important qualitative information on its morphology and kinematics. Emission is found to be enhanced along an axis moving from east/west to north-east/south-west when the angular distance from the central star projected on the plane of the sky increases from zero to four arcseconds. In parallel, the Doppler velocity distribution displays asymmetry along an axis moving from east/west to north-west/south-east. The results are discussed in the context of earlier observations, in particular of the dust morphology.We analyse ALMA observations of the12CO（3-2） emission of the circumstellar envelope（CSE）of the Mira variable binary star W Aql. These provide, for the first time, spatially resolved Doppler velocity spectra of the CSE up to angular distances to the central star ofy nature of the observations（only five minutes in each of～5′′（meaning some 2000 AU）. The explorator two different configurations） does not allow for a detailed modelling of the properties of the CSE but provides important qualitative information on its morphology and kinematics. Emission is found to be enhanced along an axis moving from east/west to north-east/south-west when the angular distance from the central star projected on the plane of the sky increases from zero to four arcseconds. In parallel, the Doppler velocity distribution displays asymmetry along an axis moving from east/west to north-west/south-east. The results are discussed in the context of earlier observations, in particular of the dust morphology.

关 键 词：STARS AGB and post-AGB （stars ） circumstellar matter stars individual（W Aql） stars mass-loss radio lines STARS 

分 类 号：P145.2[天文地球—天体物理]