GARDAN, E.; GERARD, E.; LE BERTRE, T.

Métadonnées

Licence d’utilisation du document

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]

GERARD, E.
Galaxies, Etoiles, Physique, Instrumentation [GEPI]

LE BERTRE, T.
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]

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Article de revue

Ce document a été publié dans

Monthly Notices of the Royal Astronomical Society. 2006, vol. 365, p. 245-254

Oxford University Press (OUP): Policy P - Oxford Open Option A

Résumé en anglais

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 ?m< Réduire

Mots clés en anglais

stars: late- type

stars: mass-loss

(ISM:) planetary nebulae: general

radio lines: stars

stars: AGB and post-AGB

(stars:) circumstellar matter

radio lines: stars.

Origine

Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804