A dynamical evolution study of 40 <scp>2MASS</scp> open clusters

Güneş, Orhan; Karataş, Yüksel; Bonatto, Charles Jose

doi:10.1002/asna.201712978

Cited by 12 publications

(8 citation statements)

References 65 publications

(103 reference statements)

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“…In the case of Trumpler 20, we report a total mass deviating at a 3𝜎 level from lowest mass of the values reported in the literature: 6700 ± 800 M (Donati et al 2014) and 15000 M (Günes , et al 2017). In the case of NGC 4815, we present a total mass value that duplicates more consolidated values based on optical photometry data (Chen et al 1998;Prisinzano et al 2001).…”

Section: Cluster Total Masscontrasting

confidence: 42%

The VVV Open Cluster Project. Near-infrared sequences of NGC6067, NGC6259, NGC4815, Pismis18, Trumpler23, and Trumpler20

Ramírez,

González-Fernández,

Chené

et al. 2021

Preprint

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Open clusters are central elements of our understanding of the Galactic disk evolution, as an accurate determination of their parameters leads to an unbiased picture of our Galaxy's structure. Extending the analysis towards fainter magnitudes in cluster sequences has a significant impact on the derived fundamental parameters, such as extinction and total mass. We perform a homogeneous analysis of six open stellar clusters in the Galactic disk using kinematic and photometric information from the Gaia DR2 and VVV surveys: NGC 6067, NGC 6259, NGC 4815, Pismis 18, Trumpler 23, and Trumpler 20. We implement two coarse-to-fine characterization methods: first, we employ Gaussian mixture models to tag fields around each open cluster in the proper motion space, and then we apply an unsupervised machine learning method to make the membership assignment to each cluster. For the studied clusters, with ages in the ∼120-1900 Myr range, we report an increase of ∼45% new member candidates on average in our sample. The data-driven selection approach of cluster members makes our catalog a valuable resource for testing stellar evolutionary models and for assessing the cluster low-to-intermediate mass populations. This study is the first of a series intended to homogeneously reveal open cluster near-infrared sequences.

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Section: Cluster Total Masscontrasting

confidence: 42%

The VVV Open Cluster Project. Near-infrared sequences of NGC6067, NGC6259, NGC4815, Pismis18, Trumpler23, and Trumpler20

Ramírez,

González-Fernández,

Chené

et al. 2021

Preprint

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“…11, 14, and 17). From panel (a), NGC 2587, Mel 72 and Pismis 7 do not follow the relation of Güneş et al (2017). These OCs can be partly attributed to clusters with large radii retaining their masses.…”

Section: Dynamical Evolution Of Four Ocsmentioning

confidence: 92%

Astrophysical Parameters and Dynamical Evolution of Open Clusters: NGC 2587, Col 268, Mel 72, Pismis 7

Çakmak,

Güneş,

Karataş

et al. 2021

Preprint

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We determined astrophysical and dynamical parameters of the open clusters (OCs) NGC 2587, Collinder 268 (Col 268), Melotte 72 (Mel 72), and Pismis 7 from Gaia DR2 photometric/astrometric data and a new technique, fitCMD.fitCMD provides (Z, Age(Gyr)) as (0.025, 0.45) for NGC 2587, (0.0025, 0.5) for Col. 268, (0.011, 1.25) for Mel 72, and (0.008, 1.00) for Pismis 7, respectively. As compared to Gaia DR2 distances , the obtained photometric distances from fitCMD provide somewhat close distances. For NGC 2587 and Mel. 72, both distances are in good concordance.Except for NGC 2587, the ages of the remaining OCs are higher than their relaxation times, which suggests that they are dynamically relaxed. NGC 2587 did not undergo dynamical evolution. Mel 72 and Pismis 7 with relatively flat MF slopes indicate signs of a somewhat advanced dynamical evolution, in the sense that they appear to have lost a significant fraction of their low-mass stars to the field. Pismis 7's negative/flat MFs indicates that its high mass stars slightly outnumber its low mass ones.Given its mild dynamical evolution, the high mass stars move towards the central region, while low-mass stars are continually being lost to the field. Col 268 presents small dimensions which suggest a primordial origin. The outer parts of Mel 72 and Pismis 7 -with large cluster radii expand with time, while Mel 72's core contracts because of dynamical relaxation (Figs. 10e-f).

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“…As discussed e.g. by Bonatto & Bica (2007) and Güneş et al (2017), the majority of OCs older than 1 Gyr lie outside the solar circle. On the other hand, the OC population gets rare in direction to the Galactic centre, because of the effects of strong absorption, crowding or dissolution by Giant Molecular Clouds (GMCs).…”

Section: Introductionmentioning

confidence: 87%

Study of the Open Clusters in Kepler Prime Field

Karataş¹,

Çakmak²,

Oralhan³

et al. 2023

Preprint

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We present a detailed study of NGC 6791, NGC 6811, NGC 6819 and NGC 6866, the four open clusters that are located in the Kepler prime field. We use new CCD 𝑈𝐵𝑉 (𝑅𝐼) 𝐾 𝐶 photometry, which was combined with Gaia EDR3 photometric/astrometric data, to derive the astrophysical parameters with two independent methods -one of them the fitCMD algorithm. Furthermore, we provide among others estimates of the mass and mass function, the cluster structure, derive the cluster orbits, and discuss the cluster dynamics. All objects belong to the older open cluster population (∼ 1 − 7 Gyr), are in an advanced dynamical stage with signs of mass segregation, and are located close to the solar circle, but show a large range in respect of radii, member stars or observed cluster mass (∼ 100 − 2000 𝑀 ). For the three younger objects we were also able to provide photometric metallicity estimates, which confirms their status as clusters with a roughly solar metallicity. The most outstanding object is clearly NGC 6791, a very old cluster with a high metallicity at a distance of about 4.5 kpc from the Sun. We estimate a probable radial migration by about 7 kpc, resulting in a birth position close to the Galactic center.

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A dynamical evolution study of 40 2MASS open clusters

Cited by 12 publications

References 65 publications

The VVV Open Cluster Project. Near-infrared sequences of NGC6067, NGC6259, NGC4815, Pismis18, Trumpler23, and Trumpler20

The VVV Open Cluster Project. Near-infrared sequences of NGC6067, NGC6259, NGC4815, Pismis18, Trumpler23, and Trumpler20

Astrophysical Parameters and Dynamical Evolution of Open Clusters: NGC 2587, Col 268, Mel 72, Pismis 7

Study of the Open Clusters in Kepler Prime Field

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