Boss 1985 - Mass loss investigation based on IUE spectra

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Eclipsing Binary Stars, M Stars, Red Giant Stars, Stellar Mass Ejection, Stellar Spectra, Ultraviolet Spectra, Forbidden Transitions, Iron, Iue, Radiative Transfer, Spectral Line Width, Stellar Winds, Ultraviolet Absorption

Scientific paper

From recent IUE observations of Boss 1985 - a VV Cep type spectroscopic binary - the authors deduce the mass loss rate of the primary M star using a non-spherical three-dimensional line transfer code applied on Fe II UV mult. 9 lines. Best agreement between observed and computed line profiles is obtained using wind velocity of 10±5 km s-1, stochastic velocity of 20±5 km s-1 and a total mass loss rate of 1.0±0.5×10-7 M_sun; yr-1. However evidence for non-negligible population of higher excitation levels of Fe II, which the authors have neglected in their mass loss determination, makes it necessary to consider this value as a lower limit.

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