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
N1 - Funding Information:
This project was supported by the Science and Technology Facilities Council (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). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC; https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of PYTHON, https://www.python.org, NUMPY (van der Walt, Colbert & Varoquaux 2011), and MATPLOTLIB (Hunter 2007). This research made use of APLPY, an open-source plotting package for PYTHON and hosted at http://aplpy.github.com (Robitaille & Bressert 2012). This research made use of ASTROPY, a community-developed core PYTHON package for Astronomy (Astropy Collaboration 2013). This research made use of TOPCAT, an interactive graphical viewer and editor for tabular data (Taylor 2005).
Funding Information:
We thank our anonymous referee for a constructive report. We thank S. Meingast and V. Roccatagliata for helpful discussions. This project was supported by the Science and Technology Facilities Council (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). This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC; https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of python , https://www.python.org , numpy (van der Walt, Colbert & Varoquaux ), and matplotlib (Hunter ). This research made use of aplpy , an open-source plotting package for python and hosted at http://aplpy.github.com (Robitaille & Bressert ). This research made use of astropy , a community-developed core python package for Astronomy (Astropy Collaboration ). This research made use of topcat , an interactive graphical viewer and editor for tabular data (Taylor ).
Publisher Copyright:
© 2021 Oxford University Press. All rights reserved.
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
UR - http://www.scopus.com/inward/record.url?scp=85127048375&partnerID=8YFLogxK
U2 - 10.1093/mnrasl/slab029
DO - 10.1093/mnrasl/slab029
M3 - Article
AN - SCOPUS:85127048375
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 -