AN INTERFEROMETRIC SPECTRAL-LINE SURVEY OF IRC+10216 IN THE 345 GHz BAND

被引：59

作者：

Patel, Nimesh A. ^{[1
]}

Young, Ken H. ^{[1
]}

Gottlieb, Carl A. ^{[1
]}

Thaddeus, Patrick ^{[1
]}

Wilson, Robert W. ^{[1
]}

Menten, Karl M. ^{[2
]}

Reid, Mark J. ^{[1
]}

McCarthy, Michael C. ^{[1
]}

Cernicharo, Jose ^{[3
]}

He, Jinhua ^{[4
]}

Bruenken, Sandra ^{[5
]}

Dinh-V. Trung ^{[6
]}

Keto, Eric ^{[1
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[3] INTA CSIC, Lab Mol Astrophys, Dept Astrophys, CAB, Madrid 28850, Spain

[4] Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China

[5] Univ Cologne, Inst Phys 1, D-50937 Cologne, Germany

[6] Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2011年 / 193卷 / 01期

关键词：

astrochemistry; line: identification; stars: AGB and post-AGB; stars:; individual; (IRC+10216; CW Leo); surveys; GIANT BRANCH STARS; SUBMILLIMETER OBSERVATIONS; CIRCUMSTELLAR ENVELOPE; MOLECULAR-SPECTROSCOPY; COLOGNE DATABASE; EVOLVED STARS; CARBON STAR; IRC +10216; EMISSION; MILLIMETER;

D O I：

10.1088/0067-0049/193/1/17

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report a spectral-line survey of the extreme carbon star IRC+10216 carried out between 293.9 and 354.8 GHz with the Submillimeter Array. A total of 442 lines were detected, more than 200 for the first time; 149 are unassigned. Maps at an angular resolution of similar to 3 '' were obtained for each line. A substantial new population of narrow lines with an expansion velocity of similar to 4 km s(-1) (i.e., approximate to 30% of the terminal velocity) was detected. Most of these are attributed to rotational transitions within vibrationally excited states, emitted from energy levels above the v = 0, J = 0 ground state with excitation energy of 1000-3000 K. Emission from these lines appears to be centered on the star with an angular extent of < 1 ''. We use multiple transitions detected in several molecules to derive physical conditions in this inner envelope of IRC+10216.

引用

页数：65

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