HERSCHEL/HIFI OBSERVATIONS OF IRC+10216: WATER VAPOR IN THE INNER ENVELOPE OF A CARBON-RICH ASYMPTOTIC GIANT BRANCH STAR

被引：15

作者：

Neufeld, David A. ^{[1
]}

Gonzalez-Alfonso, Eduardo ^{[2
]}

Melnick, Gary J. ^{[3
]}

Szczerba, Ryszard ^{[4
]}

Schmidt, Miroslaw ^{[4
]}

Decin, Leen ^{[5
]}

de Koter, Alex ^{[6
,7
]}

Schoier, Fredrik ^{[8
]}

Cernicharo, Jose ^{[9
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Univ Alcala de Henares, Dept Fis, E-28871 Madrid, Spain

[3] Harvard Smithsonian CfA, Cambridge, MA 02138 USA

[4] N Copernicus Astron Ctr, Torun, Poland

[5] Katholieke Univ Leuven, Inst Sterrenkunde, Louvain, Belgium

[6] Univ Amsterdam, Sterrenkundig Inst Anton Pannekoek, NL-1098 Amsterdam, Netherlands

[7] Univ Utrecht, Astron Inst, NL-3508 TC Utrecht, Netherlands

[8] Chalmers Univ Technol, Dept Radio & Space Sci, Onsala Space Observ, SE-43992 Onsala, Sweden

[9] CSIC, INTA, CAB, Madrid, Spain

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 727卷 / 02期

基金：

美国国家航空航天局;

关键词：

circumstellar matter; stars: abundances; stars: AGB and post-AGB; CIRCUMSTELLAR ENVELOPES; LINE SURVEY; CHEMISTRY;

D O I：

10.1088/2041-8205/727/2/L28

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the results of observations of 10 rotational transitions of water vapor toward the carbon-rich asymptotic giant branch (AGB) star IRC+10216 (CW Leonis), carried out with Herschel's HIFI instrument. Each transition was securely detected by means of observations using the dual beam switch mode of HIFI. The measured line ratios imply that water vapor is present in the inner outflow at small distances (<= few x 10(14) cm) from the star, confirming recent results reported by Decin et al. from observations with Herschel's PACS and SPIRE instruments. This finding definitively rules out the hypothesis that the observed water results from the vaporization of small icy objects in circular orbits. The origin of water within the dense C-rich envelope of IRC+10216 remains poorly understood. We derive upper limits on the (H2O)-O-17/(H2O)-O-16 and (H2O)-O-18/(H2O)-O-16 isotopic abundance ratios of similar to 5 x 10(-3) (3 sigma), providing additional constraints on models for the origin of the water vapor in IRC+10216.

引用

页数：5

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