Atomic hydrogen in AGB circumstellar environments. A case study : X Her
GARDAN, E.
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
GARDAN, E.
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
< Reduce
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Language
en
Article de revue
This item was published in
Monthly Notices of the Royal Astronomical Society. 2006, vol. 365, p. 245-254
Oxford University Press (OUP): Policy P - Oxford Open Option A
English Abstract
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 Nan¸cay RadioTelescope. At the star position the line shows 2 components: ...Read more >
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 Nan¸cay RadioTelescope. At the star position the line shows 2 components: (i) a broad one (FWHM 13 kms?1) centered at ?72.2 kms?1, and (ii) a narrow one (FWHM 4 kms?1) centered at ?70.6 kms?1. Our map shows that the source associated to the broad component is asymmetric with material flowing preferentially towards the North-East. This source extends to 10? ( 0.4 pc) from the star in that direction. On the other hand, the narrow component is detected only at the star position and indicates mate-rial flowing away from the observer. The total mass of atomic hydrogen is 6.5 10?3 M? which, within a factor 2, agrees with the estimate obtained from IRAS data at 60 ?mRead less <
English Keywords
stars: late- type
stars: mass-loss
(ISM:) planetary nebulae: general
radio lines: stars
stars: AGB and post-AGB
(stars:) circumstellar matter
radio lines: stars.
Origin
Hal imported