SUBMILLIMETER NARROW EMISSION LINES FROM THE INNER ENVELOPE OF IRC+10216

被引：30

作者：

Patel, Nimesh A. ^{[1
]}

Young, Ken H. ^{[1
]}

Bruenken, Sandra ^{[1
]}

Wilson, Robert W. ^{[1
]}

Thaddeus, Patrick ^{[1
]}

Menten, Karl M. ^{[2
]}

Reid, Mark ^{[1
]}

McCarthy, Michael C. ^{[1
]}

Dinh-V-Trung ^{[3
]}

Gottlieb, Carl A. ^{[1
]}

Hedden, Abigail ^{[1
]}

机构：

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

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

[3] Acad Sinica, Inst Astron & Astrophys, Taipei 115, Taiwan

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 692卷 / 02期

关键词：

circumstellar matter; radio lines: stars; stars: individual (IRC+10216); stars: late-type; submillimeter; CARBON STAR IRC+10216; VIBRATIONALLY EXCITED CS; MOLECULAR-SPECTROSCOPY; COLOGNE DATABASE; EVOLVED STARS; IRC +10216; ABUNDANCES; MILLIMETER; SULFUR; MASER;

D O I：

10.1088/0004-637X/692/2/1205

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A spectral-line survey of IRC+ 10216 in the 345 GHz band has been undertaken with the Submillimeter Array. Although not yet completed, it has already yielded a fairly large sample of narrow molecular emission lines with line widths indicating expansion velocities of similar to 4 km s(-1), less than three times the well known value of the terminal expansion velocity (14.5 km s(-1)) of the outer envelope. Five of these narrow lines have now been identified as rotational transitions in vibrationally excited states of previously detected molecules: the nu = 1, J = 17-16, and J = 19-18 lines of Si(34)S and (29)SiS and the nu = 2, J = 7-6 line of CS. Maps of these lines show that the emission is confined to a region within similar to 60 AU of the star, indicating that the narrow-line emission is probing the region of dust formation where the stellar wind is still being accelerated.

引用

页码：1205 / 1210

页数：6

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