Monoceros OB4: a new association in Gaia DR2

P S Teixeira; J Alves; A Sicilia-Aguilar; A Hacar; A Scholz

doi:10.1093/mnrasl/slab029

Monoceros OB4: a new association in Gaia DR2

P S Teixeira, J Alves, A Sicilia-Aguilar, A Hacar, A Scholz

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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 × 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
Early online date	31 Mar 2021
DOIs	https://doi.org/10.1093/mnrasl/slab029
Publication status	Published - Jun 2021

Keywords

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

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10.1093/mnrasl/slab029

Teixeira_2021_MNRAS_Monoceros_AAM
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.
Accepted author manuscript, 0.98 MB

Astronomy at St Andrews 2018-2021: Astronomy at St Andrews 2018-2021
Jardine, M. M. (PI), Bonnell, I. A. (CoI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Dominik, M. (CoI), Helling, C. (CoI), Horne, K. D. (CoI), Scholz, A. (CoI), Tojeiro, R. (CoI), Weijmans, A.-M. (CoI), Wild, V. (CoI), Woitke, P. (CoI), Wood, K. (CoI) & Zhao, H. (CoI)
1/04/18 → 31/03/22
Project: Standard

Cite this

@article{aea5fe2f9fbc4e32ba4fc3f840ac36c9,

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 × 60 pc.",

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

author = "Teixeira, {P S} and J Alves and A Sicilia-Aguilar and A Hacar and A Scholz",

note = "Funding: This project was supported by STFC grant ST/R000824/1. ASA is partly supported by STFC grant ST/S000399/1. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. 851435). ",

year = "2021",

month = jun,

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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publisher = "Oxford University Press",

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TY - JOUR

T1 - Monoceros OB4

T2 - a new association in Gaia DR2

AU - Teixeira, P S

AU - Alves, J

AU - Sicilia-Aguilar, A

AU - Hacar, A

AU - Scholz, A

N1 - Funding: This project was supported by STFC grant ST/R000824/1. ASA is partly supported by STFC grant ST/S000399/1. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. 851435).

PY - 2021/6

Y1 - 2021/6

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 × 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 × 60 pc.

KW - ISM: individual objects: Monoceros OB1 cloud complex

KW - Stars: pre-main-sequence

KW - Galaxy: open clusters and association: general

U2 - 10.1093/mnrasl/slab029

DO - 10.1093/mnrasl/slab029

M3 - Article

SN - 1745-3925

VL - 504

SP - L17–L21

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

Monoceros OB4: a new association in Gaia DR2

Abstract

Keywords

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Projects

Astronomy at St Andrews 2018-2021: Astronomy at St Andrews 2018-2021

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