Mon. Not. R. Astron. Soc., 464, 3561-3567 (2017/January-3)
A close encounter of the massive kind.
MAIZ-APELLANIZ J., SANA H., BARBA R.H., LE BOUQUIN J.-B. and GAMEN R.C.
Abstract (from CDS):
We have used (i) Hubble Space Telescope Advanced Camera for Surveys imaging and Space Telescope Imaging Spectrograph spectroscopy, (ii) ground-based Precision Integrated-Optics Near-infrared Imaging ExpeRiment/Very Large Telescope long-baseline interferometry, and (iii) ground-based spectroscopy from different instruments to study the orbit of the extreme multiple system HD 93 129 Aa,Ab, which is composed of (at least) two very massive stars in a long-period orbit with e > 0.92, which will pass through periastron in 2017/2018. In several ways, the system is an η Car precursor. Around the time of periastron passage, the two very strong winds will collide and generate an outburst of non-thermal hard X-ray emission without precedent in an O+O binary since astronomers have been able to observe above Earth's atmosphere. A coordinated multiwavelength monitoring in the next two years will enable a breakthrough understanding of the wind interactions in such extreme close encounters. Furthermore, we have found evidence that HD 93 129 Aa may be a binary system itself. In that case, we could witness a three-body interaction which may yield a runaway star or a stellar collision close to or shortly after the periastron passage. Either of those outcomes would be unprecedented, as they are predicted to be low-frequency events in the Milky Way.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
ephemerides - binaries: visual - stars: individual: (HD 93 129 Aa,Ab) - stars: kinematics and dynamics - stars: winds, outflows - X-rays: stars - X-rays: stars
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