HD 134439 and HD 134440

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HD 134439 and HD 134440 are a pair of

The stars are believed to originate from outside of the

Binary system

It is unknown if HD 134439 and 134440 are actually orbiting each other, as at their distance, they would have to be a minimum 0.14 light-years (8,900 au) apart from each other, which would make them one of the widest binary systems known. Further adding to this, using Gaia data, HD 134440 appears to be 0.54±0.26 light years further than HD 134439,^[3] resulting in a true separation of 0.56±0.25 light years from each other. If they are orbiting each other, they would have an orbital period on the scale of 5.3±3 million years, making them one of the longest period binary systems known as well.^{[citation needed]}

Destroyed planet

In a 2018 study, it was found that HD 134440 had a noticeably higher metallicity than HD 134439, which could be potentially explained by the star having engulfed a planet orbiting it, suggesting that it may be possible for planets to form even around stars with extremely low content of planet-forming material.^[2]

References