EDP Sciences
Free access
Volume 403, Number 3, June I 2003
Page(s) 1023 - 1029
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20030498

A&A 403, 1023-1029 (2003)
DOI: 10.1051/0004-6361:20030498

Estimation of the mass loss, opening angle and mass of Be circumstellar disks from Br $\mathsf{\gamma}$ continuum emission and interferometric measurements

Ph. Stee

Observatoire de la Côte d'Azur, Département FRESNEL, CNRS UMR 6528, Site de Grasse-Roquevignon, Avenue Copernic, 06130 Grasse, France
(Received 2 December 2002 / Accepted 13 March 2003)

Using the SIMECA code developed by Stee & Araùjo (1994); Stee et al. (1995) for Be stars we obtain a correlation between the mass loss rates ${\dot M}$ and the Br $\gamma$ continuum luminosity as a function of the opening angle of the disk. We show that this correlation is similar to those obtained by Scuderi et al. (1998) for O-B supergiants. We found that the wind density at the base of the photosphere, from a sample of 8 Be stars, lies between 10 -13 and 10 -12 g cm -3. We also present a relationship between the mass of the circumstellar disk and the 2.16  $\mu$m flux. Finally we emphasize how interferometric measurements can help to estimate the wind density and we present a sample of 16 Be stars with predicted visibilities that can be observed with the VLTI.

Key words: stars: emission line, Be -- stars: winds, outflows -- technique: interferometric

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