Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297..175m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. 175-182
Astronomy and Astrophysics
Astrophysics
11
Line Spectra, Stellar Envelopes, Stellar Models, Stellar Spectra, Abundance, Disk Galaxies, Gas Flow, Red Shift, Stability
Scientific paper
New high resolution spectra of beta Pictoris have been acquired in the Ca II triplet lines, arising from the 3D metastable level. In addition to the central circumstellar component at the stellar velocity, we also unambiguously detected redshifted features. These variable components have an unexpected intensity, relatively to the associated absorption measured in the K and H arising from the ground level of Ca II. In order to realize the observed fractional population (Ca II)/ CaII, a simple model of the 3D levels populating processes, including radiative and collisional processes give some constraints on the physical conditions in the observed gas: most of the central absorption occurs in a confined area within 10 AU of the star, as already established in Hobbs et al, (1988), but also the infalling gas reaches locally high electronic densities and tempertures (Te greater than or equal to 15,000 K and Ne greater than or equal to 106 cm-3).
Lagrange Anne Marie
Mouillet David
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