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Journal Article

The GALAH survey and Gaia DR2: (non-)existence of five sparse high-latitude open clusters

MPS-Authors

Kos,  Janez
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

de Silva,  Gayandhi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Buder,  Sven
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bland-Hawthorn,  Joss
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sharma,  Sanjib
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Asplund,  Martin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

D'Orazi,  Valentina
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Duong,  Ly
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Freeman,  Ken
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lewis,  Geraint F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lin,  Jane
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lind,  Karin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martell,  Sarah L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schlesinger,  Katharine J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Simpson,  Jeffrey D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zucker,  Daniel B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zwitter,  Tomaž
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bedding,  Timothy R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Čotar,  Klemen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Horner,  Jonathan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nordlander,  Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stello,  Denis
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ting,  Yuan-Sen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Traven,  Gregor
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018MNRAS.480.5242K
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Citation

Kos, J., de Silva, G., Buder, S., Bland-Hawthorn, J., Sharma, S., Asplund, M., et al. (2018). The GALAH survey and Gaia DR2: (non-)existence of five sparse high-latitude open clusters. Monthly Notices of the Royal Astronomical Society, 480, 5242-5259.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CCC0-C
Abstract
Sparse open clusters can be found at high galactic latitudes where loosely populated clusters are more easily detected against the lower stellar background. Because most star formation takes place in the thin disc, the observed population of clusters far from the Galactic plane is hard to explain. We combined spectral parameters from the GALAH survey with the Gaia DR2 catalogue to study the dynamics and chemistry of five old sparse high-latitude clusters in more detail. We find that four of them (NGC 1252, NGC 6994, NGC 7772, NGC 7826) - originally classified in 1888 - are not clusters but are instead chance projections on the sky. Member stars quoted in the literature for these four clusters are unrelated in our multidimensional physical parameter space; the quoted cluster properties in the literature are therefore meaningless. We confirm the existence of visually similar NGC 1901 for which we provide a probabilistic membership analysis. An overdensity in three spatial dimensions proves to be enough to reliably detect sparse clusters, but the whole six-dimensional space must be used to identify members with high confidence, as demonstrated in the case of NGC 1901.