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The UV spectrum of the Be star HD 50138.

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Be Star Newsletter, Number 8, September 1983

-2-COHTRIBUnOHS

•

•••

THE UV SPECTRUM OF THE Be STAR HD 50138

D. HUTSEMEKERS Institut d'Astrophysique

Liège - Belgique

-=-ABSTRACT

The lUE satellite was used to record the high resolution ultraviolet

o

spectrum (H -v 1250 - 3180 A )of the Be star HD 50138.The most prominent spectral features of this object belong ta various ionisation stages and show very ttifferent line profiles. Tbc:Iaedue ta the SiIV resonance lines are wide and asymmetrical, giving evidelJce of en expansion of the atmosphere in which they are fQrmed (Vedge '" 600 km/s). The Mg II resonance Unes show a longward emissioa protïle quite unusual for a Be star, which could be caused by a fluores-cence mechanism driven by Ly 8.

The lines due to Fe II show a complete shell spectrum (about 300 lines are identified), indicating a small but definite expansion. ln the long wavelength range, aclear emission is seen for the most intense Fe

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multiplets and is pro-bably related to the decrease of the continuum.

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The ultraviolet spectrum of the Be star HD 50138

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