Monoceros OB4: a new association in Gaia DR2

Paula Stella Teixeira; João Alves; Aurora Sicilia-Aguilar; Alvaro Hacar; Alexander Scholz

doi:10.1093/mnrasl/slab029

Monoceros OB4: a new association in Gaia DR2

Paula Stella Teixeira (Lead / Corresponding author), João Alves, Aurora Sicilia-Aguilar, Alvaro Hacar, Alexander Scholz

Physics

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Abstract

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 x 60 pc.

Original language	English
Pages (from-to)	L17-L21
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	504
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slab029
Publication status	Published - 31 Mar 2021

Keywords

ISM: individual objects: Monoceros OB1 cloud complex
Stars: pre-main sequence
Galaxy: open clusters and association: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnrasl/slab029

Author Accepted ManuscriptAccepted author manuscript, 1.02 MB

Cite this

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title = "Monoceros OB4: a new association in Gaia DR2",

abstract = "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 x 60 pc.",

keywords = "ISM: individual objects: Monoceros OB1 cloud complex, Stars: pre-main sequence, Galaxy: open clusters and association: general",

author = "Teixeira, {Paula Stella} and Jo{\~a}o Alves and Aurora Sicilia-Aguilar and Alvaro Hacar and Alexander Scholz",

year = "2021",

month = mar,

day = "31",

doi = "10.1093/mnrasl/slab029",

language = "English",

volume = "504",

pages = "L17--L21",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

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TY - JOUR

T1 - Monoceros OB4

T2 - a new association in Gaia DR2

AU - Teixeira, Paula Stella

AU - Alves, João

AU - Sicilia-Aguilar, Aurora

AU - Hacar, Alvaro

AU - Scholz, Alexander

PY - 2021/3/31

Y1 - 2021/3/31

N2 - 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 x 60 pc.

AB - 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 x 60 pc.

KW - ISM: individual objects: Monoceros OB1 cloud complex

KW - Stars: pre-main sequence

KW - Galaxy: open clusters and association: general

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U2 - 10.1093/mnrasl/slab029

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VL - 504

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JF - Monthly Notices of the Royal Astronomical Society: Letters

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Monoceros OB4: a new association in Gaia DR2

Abstract

Keywords

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The Planet-Disc Connection: Accretion, Disc Structure and Plant Formation

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Monoceros OB4: a new association in Gaia DR2

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ASJC Scopus subject areas

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The Planet-Disc Connection: Accretion, Disc Structure and Plant Formation

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