A third massive star component in the σ Orionis AB system

Details A third massive star component in the σ Orionis AB system A third massive star component in the σ Orionis AB system

2011-08-23

arxiv.org/abs/1108.4622v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 3 figures, 2 tables. Accpeted for publication in ApJ

Scientific paper

We report on the detection of a third massive star component in the \sigma\ Orionis AB system, traditionally considered as a binary system. The system has been monitored by the IACOB spectroscopic survey of Northern Massive stars program, obtaining 23 high-resolution FIES@NOT spectra with a time-span of ~2.5 years. The analysis of the radial velocity curves of the two spectroscopic components observed in the spectra has allowed us obtain the orbital parameters of the system, resulting in a high eccentric orbit (e~0.78) with an orbital period of 143.5 +/- 0.5 d. This result implies the actual presence of three stars in the \sigma\ Orionis AB system when combined with previous results obtained from the study of the astrometric orbit (with an estimated period of ~157 yr).

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