First detection of methanol towards a post-AGB object, HD 101584

被引：13

作者：

Olofsson, H. ^{[1
]}

Vlemmings, W. H. T. ^{[1
]}

Bergman, P. ^{[1
]}

Humphreys, E. M. L. ^{[2
]}

Lindqvist, M. ^{[1
]}

Maercker, M. ^{[1
]}

Nyman, L. ^{[3
,4
]}

Ramstedt, S. ^{[5
]}

Tafoya, D. ^{[1
]}

机构：

[1] Chalmers, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden

[2] ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[3] Joint ALMA Observ, Alonso Cordova 3107, Vitacura, Santiago De Chi, Chile

[4] ESO, Alonso Cordova 3107, Santiago, Chile

[5] Uppsala Univ, Dept Phys & Astron, POB 516, S-75120 Uppsala, Sweden

来源：

ASTRONOMY & ASTROPHYSICS | 2017年 / 603卷

基金：

瑞典研究理事会; 欧洲研究理事会;

关键词：

circumstellar matter; stars: individual: HD 101584; stars: AGB and post-AGB; radio lines: stars; RICH CIRCUMSTELLAR ENVELOPES; DIFFERENT CHEMICAL TYPE; OXYGEN ISOTOPIC-RATIOS; MILLIMETER WAVELENGTHS; STAR-FORMATION; LINE SURVEY; EMISSION; SHOCK; OUTFLOW; MASS;

D O I：

10.1051/0004-6361/201731170

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The circumstellar environments of objects on the asymptotic giant branch and beyond are rich in molecular species. Nevertheless, methanol has never been detected in such an object, and is therefore often taken as a clear signpost for a young stellar object. However, we report the first detection of CH3OH in a post-AGB object, HD 101584, using ALMA. Its emission, together with emissions from CO, SiO, SO, CS, and H2CO, comes from two extreme velocity spots on either side of the object where a high-velocity outflow appears to interact with the surrounding medium. We have derived molecular abundances, and propose that the detected molecular species are the effect of a post-shock chemistry where circumstellar grains play a role. We further provide evidence that HD 101584 was a low-mass, M-type AGB star.

引用

页数：5

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