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Investigation on fundamental plane of open clusters

Published online by Cambridge University Press:  02 August 2018

Xiao-Ying Pang  and
Chien-Cheng Lin Open the ORCID record for Chien-Cheng Lin [Opens in a new window]
Xiao-Ying Pang
Affiliation:
Shanghai Institute of Technology, 100 Haiquan Rd., 201418 Shanghai, China email: xypang@bao.ac.cn Key Lab for Astrophyscis, 100 Guilin Rd, 200234 Shanghai, China
Chien-Cheng Lin
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany email: cclin@mpia.de
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Abstract

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The fundamental plane (FP) is the relation between the surface brightness (I), velocity dispersion (σ) and radius (R). The tilt of FP from the virial plane (R = σ2I) not only tells the dynamical states of the system but also its formation and evolution. We motivate to looking for an FP in Galactic open clusters (OCs). To form a sample of OCs, we access the most recent DR 14 data from the SDSS/APOGEE2 and the Gaia-ESO survey. Membership of stars is determined via radial velocity and metallicity, plus star’s location in the color-magnitude diagram. Besides the velocity dispersion (σrv) obtained from SDSS/APOGEE2 & Gaia-ESO, the average surface brightness (IKs), and apparent radii (r2) of OCs are taken from known OC catalog. A weak relation is found: log(r2) ∝ -0.34 * log(σ) - 0.08 * IKs. An implication of this FP needs further investigation.

Keywords

(Galaxy:) open clusters and associations: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 331 - 332
Copyright
Copyright © International Astronomical Union 2018 

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