A PILOT IMAGING LINE SURVEY OF RW LMi AND IK Tau USING THE EXPANDED VERY LARGE ARRAY

被引：11

作者：

Claussen, M. J. ^{[1
]}

Sjouwerman, L. O. ^{[1
]}

Rupen, M. P. ^{[1
]}

Olofsson, H. ^{[2
]}

Schoier, F. L. ^{[2
]}

Bergman, P. ^{[2
]}

Knapp, G. R. ^{[3
]}

机构：

[1] Natl Radio Astron Observ, Socorro, NM 87801 USA

[2] Chalmers, Onsala Space Observ, Dept Radio & Space Sci, S-43992 Onsala, Sweden

[3] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 739卷 / 01期

关键词：

radio continuum: stars; radio lines: stars; stars: AGB and post-AGB; stars: individual (RW LMi; IK Tau); CIRCUMSTELLAR ENVELOPES; CARBON STARS; AGB STARS; IRC+10216; EMISSION; DUST;

D O I：

10.1088/2041-8205/739/1/L5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on a pilot imaging line survey (36.0-37.0 GHz, with similar to 1 km s(-1) spectral channels) with the Expanded Very Large Array for two asymptotic giant branch stars, RW LMi (= CIT6, which has a carbon-rich circumstellar envelope, CSE) and IK Tau (=NML Tau, with an oxygen-rich CSE). Radio continuum emission consistent with photospheric emission was detected from both stars. From RW LMi we imaged the HC(3)N (J = 4 -> 3) emission. The images show several partial rings of emission; these multiple shells trace the evolution of the CSE from 400 to 1200 years. SiS (J = 2 -> 1) emission was detected from both RW LMi and IK Tau. For both stars the SiS emission is centrally condensed with the peak line emission coincident with the stellar radio continuum emission. In addition, we have detected weak HC(7)N (J = 32 -> 31) emission from RW LMi.

引用

页数：6

共 21 条

[1]

Bloecker T., 1995, ASTRON ASTROPHYS, V297, P727

[2] CIRCUMSTELLAR ENVELOPE STRUCTURE OF LATE-TYPE STARS [J].