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A Pilot Imaging Line Survey of RW LMi and IK Tau Using the Expanded Very Large Array

M. J. Claussen ; Loránt Olivér Sjouwerman ; M. P. Rupen ; Hans Olofsson (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Fredrik L. Schöier (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; Per Bergman (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; G. R. Knapp
Astrophysical Journal Letters (2041-8205). Vol. 739 (2011), 1, p. L5.
[Artikel, refereegranskad vetenskaplig]

We report on a pilot imaging line survey (36.0-37.0 GHz, with ~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 HC3N (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 HC7N (J = 32→31) emission from RW LMi.



Denna post skapades 2011-09-06. Senast ändrad 2014-09-02.
CPL Pubid: 145878

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)

Ämnesområden

Stjärnors bildning och utveckling

Chalmers infrastruktur