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Paper: Determination of Be-star Inclinations from Gravity-Darkened Photospheric Spectra
Volume: 361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics
Page: 518
Authors: Vinicius, M.-M.F.; Townsend, R.H.D.; Leister, N.V.
Abstract: In this paper, we report on our ongoing effort to develop unified models for seven Helium photospheric absorption profiles of 5 early-type Be stars: α Eri (HD10144 - B3Vpe), η Cen (HD127972 - B1.5Vne), ε Cap (HD205637 - B3V:p), α Ara (HD158427 - B2Vne), and λ Pav (HD173948 - B1.5IIIe). We are using a spectral synthesis code developed by one of us (RHDT) that includes effects due to rapid rotation. In each star, we find that a simultaneous fit of all He lines can be achieved only with a pole-to-equator effective temperature gradient consistent with von Zeipel gravity darkening. This inhomogeneous temperature distribution implies the fit procedure is also sensitive to the inclination (i ) of the stellar rotation axis.
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