# Discovery of a detached HI gas shell surrounding alpha Orionis

@article{Bertre2012DiscoveryOA,
title={Discovery of a detached HI gas shell surrounding alpha Orionis},
author={Thibaut Le Bertre and Lynn D. Matthews and Eric G'erard and Yannick Libert},
journal={arXiv: Solar and Stellar Astrophysics},
year={2012}
}
• Published 1 March 2012
• Physics
• arXiv: Solar and Stellar Astrophysics
We report the detection of the HI line at 21 cm in the direction of alpha Ori with the Nancay Radiotelescope and with the Very Large Array. The observations confirm the previous detection of HI emission centered on alpha Ori, but additionally reveal for the first time a quasi-stationary detached shell of neutral atomic hydrogen ~4 arcmin. in diameter (0.24 pc at a distance of 200 pc). The detached shell appears elongated in a direction opposite to the star's space motion. A simple model shows…

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## References

SHOWING 1-10 OF 56 REFERENCES
HI in circumstellar environments
We present new results of a spectroscopic survey of circumstellar HI in the direction of evolved stars made with the Nancay Radiotelescope. The HI line at 21 cm has been detected in the circumstellar
Atomic hydrogen in asymptotic giant branch circumstellar environments. A case study: X Her
• Physics
• 2005
We report the detection of the HI line at 21 cm from the circumstellar shell around the AGB star X Her using the position-switching technique with the Nancay Radio Telescope. At the star position the
The formation of a detached shell around the carbon star Y CVn
• Physics
• 2007
Y CVn is a carbon star surrounded by a detached dust shell that has been imaged by the Infrared Space Observatory at 90 μm. With the Nancay Radio Telescope, we have studied the gaseous counterpart in
AKARI/FIS Mapping of the ISM-Wind Bow Shock around $\alpha$ Orionis
• Physics
• 2008
We present 100 500scan maps around an M supergiant Ori at 65, 90, 140, and 160 m obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the exact analytic solution
Very Large Array Observations of H I in the Circumstellar Envelopes of Asymptotic Giant Branch Stars
• Physics
• 2007
We have used the Very Large Array to search for neutral atomic hydrogen (H I) in the circumstellar envelopes of five asymptotic giant branch stars. We have detected H I 21 cm emission coincident in
CIRCUMSTELLAR ATOMIC HYDROGEN IN EVOLVED STARS
• Physics
• 2006
We present new results of a spectroscopic survey of circumstellar H I in the direction of evolved stars made with the Nan?ay Radiotelescope. The H I line at 21 cm has been detected in the
The Astrosphere of the Asymptotic Giant Branch Star Irc+10216
• Physics
• 2010
We have discovered a very extended shock structure (i.e., with a diameter of about 24') surrounding the well-known carbon star IRC+10216 in ultraviolet images taken with the Galaxy Evolution Explorer
H I OBSERVATIONS OF THE ASYMPTOTIC GIANT BRANCH STAR X HERCULIS: DISCOVERY OF AN EXTENDED CIRCUMSTELLAR WAKE SUPERPOSED ON A COMPACT HIGH-VELOCITY CLOUD
• Physics
• 2010
We report H I 21 cm line observations of the asymptotic giant branch (AGB) star X Her obtained with the Robert C. Byrd Green Bank Telescope (GBT) and the Very Large Array. We have unambiguously
Discovery of an H I Counterpart to the Extended Tail of Mira
• Physics
• 2008
We report the detection of an H I counterpart to the extended, far-ultraviolet-emitting tail associated with the asymptotic giant branch star Mira (o Ceti). Using the Nancay Radio Telescope (NRT), we
H i and CO in the circumstellar environment of the S-type star RS Cancri
• Physics
• 2010
Context. The history of mass loss during the AGB phase is key to understanding the stellar evolution and the gas and dust replenishment of the interstellar medium. The mass-loss phenomenon presents