Monoceros OB4 : a new association in Gaia DR2
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We use Gaia DR2 data to survey the classic Monoceros OB1 region and look for the existence of a dispersed young population, co-moving with the cloud complex. An analysis of the distribution of proper motions reveals a 20-30 Myr association of young stars, about 300-400 pc away from the far side of the Mon OB1 complex, along the same general line-of-sight. We characterize the new association, Monoceros OB4, and estimate it contains between 1400 and 2500 stars, assuming a standard IMF, putting it on par in size with NGC 2264. We find from the internal proper motions that Mon OB4 is unbound and expanding. Our results seem to unveil a larger and more complex Monoceros star formation region, suggesting an elongated arrangement that seems to be at least 300 × 60 pc.
Teixeira , P S , Alves , J , Sicilia-Aguilar , A , Hacar , A & Scholz , A 2021 , ' Monoceros OB4 : a new association in Gaia DR2 ' , Monthly Notices of the Royal Astronomical Society: Letters , vol. 504 , no. 1 , pp. L17–L21 . https://doi.org/10.1093/mnrasl/slab029
Monthly Notices of the Royal Astronomical Society: Letters
Copyright © 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnrasl/slab029.