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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28776
Title: The GALAH survey and Gaia DR2: (non-)existence of five sparse high-latitude open clusters
Authors: Kos, Janez
de Silva, Gayandhi
Buder, Sven
Bland-Hawthorn, Joss
Sharma, Sanjib
Asplund, Martin
D'ORAZI, VALENTINA 
Duong, Ly
Freeman, Ken
Lewis, Geraint F.
Lin, Jane
Lind, Karin
Martell, Sarah L.
Schlesinger, Katharine J.
Simpson, Jeffrey D.
Zucker, Daniel B.
Zwitter, Tomaž
Bedding, Timothy R.
Čotar, Klemen
Horner, Jonathan
Nordlander, Thomas
Stello, Denis
Ting, Yuan-Sen
Traven, Gregor
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 480
Issue: 4
First Page: 5242
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.
URI: http://hdl.handle.net/20.500.12386/28776
URL: https://academic.oup.com/mnras/article-abstract/480/4/5242/5071959?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/sty2171
Bibcode ADS: 2018MNRAS.480.5242K
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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