* Astronomy

Title: The atypical emission-line star Hen3-209
Authors: Y. Naze, G. Rauw, D. Hutsemekers, E. Gosset, J. Manfroid (ULg, Belgium), P. Royer (KUL, Belgium)

Researchers analyse observations, spanning 15 years, dedicated to the extreme emission-line object Hen3-209. Their photometric data indicate that the luminosity of the star undergoes marked variations with a peak-to-peak amplitude of 0.65mag.
These variations are recurrent, with a period of 16.093+-0.005d. The spectrum of Hen3-209 is peculiar with many different lines (HI, HeI, FeII,...) showing P Cygni profiles. The line profiles are apparently changing in harmony with the photometry.
The spectrum also contains (OIII) lines that display a saddle profile topped by three peaks, with a maximum separation of about 600km/s.
Hen3-209 is most likely an evolved luminous object suffering from mass ejection events and maybe belonging to a binary system.

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