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| Paper: |
Atomic Hydrogen in the Circumstellar Envelope of IRC+10216 |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
129 |
| Authors: |
Matthews, L. D.; Gérard, E.; Le Bertre, T. |
| Abstract: |
Using the Robert C. Byrd Green Bank Telescope (GBT), we have performed
the most sensitive search to date for neutral atomic hydrogen
(HI) associated with the circumstellar envelope (CSE)
of the carbon star IRC+10216. We report the discovery of a low surface
brightness HI shell of diameter ∼1280'' (∼0.8 pc)
surrounding the star. The shell's kinematics are consistent with matter
that has been decelerated through interaction with the interstellar
medium (ISM). The angular extent of the shell is comparable to the far
ultraviolet (FUV)-emitting astrosphere previously detected with
GALEX. The total mass of atomic hydrogen associated with
IRC+10216 is < 1% of the expected total mass of the CSE. We
briefly discuss implications for the possible origins of the
circumstellar atomic hydrogen. |
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