On the inner envelope of the Be star gamma Cassiopeiae

Details On the inner envelope of the Be star gamma Cassiopeiae On the inner envelope of the Be star gamma Cassiopeiae

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...332..268s&link_type=abstract

Astronomy and Astrophysics, v.332, p.268-272 (1998)

Astronomy and Astrophysics

Astrophysics

36

Stars: Individual: Gamma Cas, Circumstellar Matter, Stars: Emission-Line, Be, Stars: Mass-Loss, Techniques: Interferometric

Scientific paper

We report the first spectrally-resolved observations of the Be star gamma Cas in the Hei lambda 6678 and Hβ emission lines using the Grand Interferometre a2 Telescopes in the southern France. Milliarcsecond angular resolution measurements were carried in both lines and their neighbouring continuum during October and November 1993. The Hei lambda 6678 and Hβ maximum emissions correspond respectively to 1.05 and 1.5 of the local continuum level. The interferometric baselines ranged from 15m to 51m on the sky which correspond to angular resolutions of 9 to 3 mas at Hei lambda 6678 and 6.5 to 2 mas at Hβ wavelengths. We compare these values to predicted extents of Hβ and Hei lambda 6678 components of the circumstellar gas from models of radiative transfer in these lines. We conclude that the emitting region must be smaller than 8.5 stellar radius in Hβ and close to 2.3 stellar radius in Hei lambda 6678 which is, for Hei lambda 6678, smaller than the nearby continuum extent. These results confirm gamma Cas basic parameters for this star obtained by Stee et al. on 1993 from their model constrained by GI2T observations in Hα line.

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