Investigation on fundamental plane of open clusters

Pang, Xiao-Ying; Lin, Chien-Cheng

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Investigation on fundamental plane of open clusters

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Pang, Xiao-Ying
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lin, Chien-Cheng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018IAUS..334..331P
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Citation

Pang, X.-Y., & Lin, C.-C. (2018). Investigation on fundamental plane of open clusters.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CBD8-3

Abstract

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 = σ² I) 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 (σ_rv) obtained from SDSS/APOGEE2 & Gaia-ESO, the average surface brightness (I_{K_s}), 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 * I_{K_s}. An implication of this FP needs further investigation.