Structure of Open Clusters - Gaia DR2 and its limitations

J 2022

Structure of Open Clusters - Gaia DR2 and its limitations

PIECKA, Martin a Ernst PAUNZEN

Základní údaje

Originální název

Structure of Open Clusters - Gaia DR2 and its limitations

Autoři

PIECKA, Martin (703 Slovensko, garant, domácí) a Ernst PAUNZEN (40 Rakousko, domácí)

Vydání

Bulgarian Astronomical Journal, Institute of Astronomy and NAO, 2022, 1313-2709

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Bulharsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL URL

Impakt faktor

Impact factor: 0.400

Kód RIV

RIV/00216224:14310/22:00125034

Organizační jednotka

Přírodovědecká fakulta

UT WoS

000709909100001

Klíčová slova anglicky

open clusters; astrometry; galactic structure; gaia; satellite mission

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 9. 1. 2023 10:44, Mgr. Marie Šípková, DiS.

Anotace

V originále

Very precise observational data are needed for studying the stellar cluster parameters (distance, reddening, age, metallicity) and cluster internal kinematics. In turn, these give us an insight into the properties of our Galaxy, for example, by giving us the ability to trace Galactic spiral structure, star formation rates and metallicity gradients. We investigated the available Gaia DR2 catalogue of 1229 open clusters and studied cluster distances, sizes and membership distributions in the 3D space. An appropriate analysis of the parallax to-distance transformation problem is presented in the context of getting distances toward open clusters and estimating their sizes. Based on our investigation of the Gaia DR2 data we argue that, within 2 kpc, the inverse-parallax method gives comparable results (distances and sizes) as the Bayesian approach based on the exponentially decreasing volume density prior. Both of these methods show very similar dependence of the line-of-sight elongation of clusters (needle-like shapes resulting from the parallax uncertainties) on the distance. We also looked at a measure of elongations of the studied clusters and find the maximum distance of 665 pc at which a spherical fit still contains about half of the stellar population of a cluster. It follows from these results that the 3D structure of an open cluster cannot be properly studied beyond similar to 500 pc when using any of the mentioned standard transformations of parallaxes to distances.

Citovat

PIECKA, Martin a Ernst PAUNZEN. Structure of Open Clusters - Gaia DR2 and its limitations. Bulgarian Astronomical Journal. Institute of Astronomy and NAO, 2022, roč. 36, July, s. 1-27. ISSN 1313-2709.

@article{1801342,
   author = {Piecka, Martin and Paunzen, Ernst},
   article_number = {July},
   keywords = {open clusters; astrometry; galactic structure; gaia; satellite mission},
   language = {eng},
   issn = {1313-2709},
   journal = {Bulgarian Astronomical Journal},
   title = {Structure of Open Clusters - Gaia DR2 and its limitations},
   url = {https://astro.bas.bg/AIJ/issues/n36/MPiecka.pdf},
   volume = {36},
   year = {2022}
}

TY  - JOUR
ID  - 1801342
AU  - Piecka, Martin - Paunzen, Ernst
PY  - 2022
TI  - Structure of Open Clusters - Gaia DR2 and its limitations
JF  - Bulgarian Astronomical Journal
VL  - 36
IS  - July
SP  - 1-27
EP  - 1-27
PB  - Institute of Astronomy and NAO
SN  - 13132709
KW  - open clusters
KW  - astrometry
KW  - galactic structure
KW  - gaia
KW  - satellite mission
UR  - https://astro.bas.bg/AIJ/issues/n36/MPiecka.pdf
N2  - Very precise observational data are needed for studying the stellar cluster parameters (distance, reddening, age, metallicity) and cluster internal kinematics. In turn, these give us an insight into the properties of our Galaxy, for example, by giving us the ability to trace Galactic spiral structure, star formation rates and metallicity gradients. We investigated the available Gaia DR2 catalogue of 1229 open clusters and studied cluster distances, sizes and membership distributions in the 3D space. An appropriate analysis of the parallax to-distance transformation problem is presented in the context of getting distances toward open clusters and estimating their sizes. Based on our investigation of the Gaia DR2 data we argue that, within 2 kpc, the inverse-parallax method gives comparable results (distances and sizes) as the Bayesian approach based on the exponentially decreasing volume density prior. Both of these methods show very similar dependence of the line-of-sight elongation of clusters (needle-like shapes resulting from the parallax uncertainties) on the distance. We also looked at a measure of elongations of the studied clusters and find the maximum distance of 665 pc at which a spherical fit still contains about half of the stellar population of a cluster. It follows from these results that the 3D structure of an open cluster cannot be properly studied beyond similar to 500 pc when using any of the mentioned standard transformations of parallaxes to distances.
ER  -

PIECKA, Martin a Ernst PAUNZEN. Structure of Open Clusters - Gaia DR2 and its limitations. \textit{Bulgarian Astronomical Journal}. Institute of Astronomy and NAO, 2022, roč.~36, July, s.~1-27. ISSN~1313-2709.

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