Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992crasb.314.1429z&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de la Terre et de l'Univers (ISS
Physics
2
B Stars, Line Spectra, Stellar Rotation, Stellar Spectra, Continuous Spectra, Electron Scattering, Helium Ions, Stellar Envelopes
Scientific paper
The HeI 4471 line from the Be star Chi Oph (HD148184) is employed to derive the stellar parameter for rotational velocity V sin i of the object by means of a novel method. Specific attention is given to stellar parameters including effective temperature and gravity that introduce perturbing effects, and values of Teff = 31,200 K and log g = 3.9 are derived. Also accounted for are the veiling effect due to the continuum emission and the noncoherent electron-scattering effect induced by the circumstellar envelope. The value for V sin i is given as 118 km/s, as opposed to the value 140 km/s given in the literature. The effects of the stellar parameters discussed are shown to account for stronger perturbations on lines of Be stars that have strong emissions and high rotational velocities.
Ballereau Dominique
Chauville Jacques
Garcia Albert
Zorec Jean
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