The atypical emission-line star Hen3-209

Details The atypical emission-line star Hen3-209 The atypical emission-line star Hen3-209

2006-06-26

arxiv.org/abs/astro-ph/0606627v1

Mon.Not.Roy.Astron.Soc.371:1594-1600,2006

Astronomy and Astrophysics

Astrophysics

6p, 5 fig, accepted for publication in MNRAS (www.blackwell-synergy.com)

Scientific paper

10.1111/j.1365-2966.2006.10731.x

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 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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