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

Kos, Janez (author)
Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia.
de Silva, Gayandhi (author)
Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia.;Macquarie Univ, AAO MQ, Sydney, NSW 2109, Australia.
Buder, Sven (author)
MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany.;Heidelberg Univ, Int Max Planck Res Sch Astron & Cosm Phys, Heidelberg, Germany.
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Bland-Hawthorn, Joss (author)
Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia.;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.;Univ Sydney, Sydney Astrophoton Instrumentat Labs, Sch Phys, A28, Camperdown, NSW 2006, Australia.
Sharma, Sanjib (author)
Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia.
Asplund, Martin (author)
ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
D'Orazi, Valentina (author)
Osserv Astron Padova, Inst Nazl Astrofis, Vicolo Osservatorio 5, I-35122 Padua, Italy.
Duong, Ly (author)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Freeman, Ken (author)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Lewis, Geraint F. (author)
Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia.
Lin, Jane (author)
ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Lind, Karin (author)
Uppsala universitet,Teoretisk astrofysik,MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany.
Martell, Sarah L. (author)
MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany.;UNSW, Sch Phys, Sydney, NSW 2052, Australia.
Schlesinger, Katharine J. (author)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Simpson, Jeffrey D. (author)
UNSW, Sch Phys, Sydney, NSW 2052, Australia.
Zucker, Daniel B. (author)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia.
Zwitter, Tomaz (author)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.
Bedding, Timothy R. (author)
Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, DK-8000 Aarhus C, Denmark.
Cotar, Klemen (author)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.
Horner, Jonathan (author)
Univ Southern Queensland, Div Res & Innovat, Toowoomba, Qld 4350, Australia.
Nordlander, Thomas (author)
ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Stello, Denis (author)
UNSW, Sch Phys, Sydney, NSW 2052, Australia.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, DK-8000 Aarhus C, Denmark.
Ting, Yuan-Sen (author)
Inst Adv Study, Princeton, NJ 08540 USA.;Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA.;Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA.
Traven, Gregor (author)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.
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Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia.;Macquarie Univ, AAO MQ, Sydney, NSW 2109, Australia. (creator_code:org_t)
2018-08-13
2018
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 480:4, s. 5242-5259
Related links:
https://arxiv.org/pd...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

techniques: radial velocities
catalogues
surveys
parallaxes
proper motions

Publication and Content Type

ref (subject category)
art (subject category)

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