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A model for Gamma Cassiopeiae

1978; IOP Publishing; Volume: 220; Linguagem: Inglês

10.1086/155984

1538-4357

R. Poeckert, J. M. Marlborough,

Astronomical Observations and Instrumentation

view Abstract Citations (204) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A model for gamma Cassiopeiae. Poeckert, R. ; Marlborough, J. M. Abstract Linear-polarization measurements of the continuum and line profiles of H-alpha and H-beta are presented for the Be star Gamma Cas. These data are used, together with polarization measurements of the H-alpha line, continuum measures in the visible and UV, as well as an upper limit on the radio flux, in an attempt to obtain a realistic model for the circumstellar envelope of Gamma Cas. Several models are computed, the choice of parameters for a model that gives a reasonable fit to most of the data is discussed, and model fluxes and polarizations at 33 wavelengths are predicted. It is shown that the envelope emission is a significant component of the total flux at all wavelengths except shortward of 2000 A, that the envelope absorbs about 10% of the stellar flux at UV and visible wavelengths, and that the polarization of the scattered fluxes ranges between 15% and 18%, depending on wavelength. Publication: The Astrophysical Journal Pub Date: March 1978 DOI: 10.1086/155984 Bibcode: 1978ApJ...220..940P Keywords: B Stars; Emission Spectra; Polarized Electromagnetic Radiation; Stellar Envelopes; Stellar Models; Stellar Spectra; Balmer Series; Continuous Spectra; Energy Distribution; H Alpha Line; H Beta Line; H Gamma Line; Linear Polarization; Astrophysics; Be Stars:Circumstellar Shells; Be Stars:Polarization; Circumstellar Shells: Models full text sources ADS | data products SIMBAD (1)