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To be published in:
Monthly Notices of the Royal Astronomical Society

The atypical emission-line star Hen 3-209+

Y. Nazé1,*, G. Rauw1,**, D. Hutsemékers1,**, E. Gosset1,**, J. Manfroid1,*** and P. Royer2

1 Institut d'Astrophysique et de Géophysique - Université de Liège, Allée du 6 Août, Bât B5c, B-4000 Liège (Sart Tilman), Belgium
2 Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium

* Postdoctoral Researcher FNRS, Belgium
** Research Associate FNRS, Belgium
*** Research Director FNRS, Belgium

+ Based on observations collected at the European Southern Observatory (La Silla, Chile) and Cerro-Tololo Observatory (Chile).


     We analyse observations, spanning 15 years, dedicated to the extreme emission-line object Hen3-209. Our 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 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.

Key words
stars: emission-line - stars: individual: Hen 3-209 - stars: peculiar


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