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.
@article{arxiv.astro-ph/0606627,
title = {The atypical emission-line star Hen3-209},
author = {Y. Naze and G. Rauw and D. Hutsemekers and E. Gosset and J. Manfroid and P. Royer},
journal= {arXiv preprint arXiv:astro-ph/0606627},
year = {2009}
}
Comments
6p, 5 fig, accepted for publication in MNRAS (www.blackwell-synergy.com)