2005/10/05 by E. Gardan, E. Gérard, E. Gerard +1 · 2 citations
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Asymptotic giant branch #Full width at half maximum #Galaxies: Formation, Evolution, Phenomena #Geometry #Line (geometry) #Optics #Physics #Position (finance) #Star (game theory) #Stars #Stellar, planetary, and galactic studies #Telescope #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2005.09709.x
published as Mon.Not.Roy.Astron.Soc. 365 (2006) 245-254 · accepted for publication in MNRAS
arxiv created 2005/10/05 · openalex publication_date 2005/11/21 · arxiv updated 2015/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the detection of the H i line at 21 cm from the circumstellar shell around the asymptotic giant branch star X Her using the position-switching technique with the Nançay Radio Telescope. At the star position, the line shows two components: (i) a broad one [full width at half-maximum (FWHM) ∼ 13 km s−1] centred at −72.2 km s−1 and (ii) a narrow one (FWHM ∼ 4 km s−1) centred at ∼−70.6 km s −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 arcmin (∼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 material flowing away from the observer. The total mass of atomic hydrogen is ∼6.5 × 10−3 M⊙ which, within a factor of 2, agrees with the estimate obtained from IRAS data at 60 μm.