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26 April 2024 |
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Article overview
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ALMA monitoring of mm line variation in IRC+10216: I. Overview of millimeter variability | | J. H. He
; T. Kamiński
; R. E. Mennickent
; V. I. Shenavrin
; Diego Mardones
; Wei Wang
; Baitian Tang
; M. R. Schmidt
; R. Szczerba
; Jixing. Ge
; | | Date: |
15 Apr 2019 | | Abstract: | Temporal variation of millimeter lines is a new direction of research for
evolved stars. It has the potential to probe the dynamical wind launching
processes from time dimension. We report here the first results that cover the
past 817 days of an on-going monitoring project for 1.1,mm lines in the
archetypal carbon star IRC,+10216, using both the compact 7-m array (ACA) of
the Atacama Large Millimeter Array (ALMA) and an infrared telescope in tandem.
The high sensitivity of the cumulative spectra across $sim8$,GHz frequency
range has allowed us to detect about 164 known transitions of 21 molecules
together with their isotopologues and about 80 unidentified lines and their
variabilities. While only a handful of lines are found to be stable in time,
most other lines are varying either in phase with or in anti-phase against near
infrared light. The line profile shapes and variation phases of some lines are
different from the single dish results, perhaps due to different angular
resolutions. | | Source: | arXiv, 1904.7114 | | Services: | Forum | Review | PDF | Favorites | |
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