Astrophysical parameters of ten poorly studied open star clusters

Tadross, A. L.; El-Bendary, R.; Osman, Anas; Ismail, Nader; Bakry, Abdel Aziz

doi:10.1088/1674-4527/12/1/006

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…In addition, the MF values of brighter members of the system is too low for it to be an OC. The typical MF value for brighter members of any OC reported is much lower than our value (Lata et al 2014;Joshi et al 2014;Glushkova et al 2013;Yadav et al 2013;Tadross et al 2012;Tadross 2011;Bhatt, Sagar, & Pandey 2012;Sharma et al 2008). There is also a possibility that the lighter members of this system has already evaporated from its central region as expected by the phenomenon of mass segregation.…”

Section: Discussioncontrasting

confidence: 76%

Complex Stellar System ESO65SC03: Open Cluster or Remnant?

Joshi

Joshi²,

Joshi³

et al. 2015

Publ. Astron. Soc. Aust.

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We present a complete spatial and dynamical study of the poorly populated stellar system ESO65SC03. The radial distribution of the system gives a core and cluster radii of 1.10 ± 0.63 and 5.36 ± 0.24 arcmin, respectively. The SNDP does not show any clear enhancement of the surface stellar number density between the stars of the system and the field regions. We derive the optimum isochrone solution for a particular grid size in the CMD using the statistical cleaning procedure. Using the statistically cleaned CMDs, we find the distance modulus, (m − M) 0 , and reddening, E(B − V ), of the system to be 11.8 ± 0.2 and 0.45 mag, respectively. The mean proper motion of this system is −5.37 ± 0.81 mas yr −1 and 0.31 ± 0.40 in RA and DEC directions, respectively. The mean proper motion of this system is found to be almost similar to the field region. The mass function for the brighter stars is found to be too high for the system to be an open cluster. These combined results place constraints on whether stellar system ESO65SC03 is a POCR or an Asterism. Our understanding is that the ESO65SC03 is in a stage of POCR by losing their main-sequence stars in the dynamic evolution processes.

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Section: Discussioncontrasting

confidence: 76%

Complex Stellar System ESO65SC03: Open Cluster or Remnant?

Joshi

Joshi²,

Joshi³

et al. 2015

Publ. Astron. Soc. Aust.

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“…There is an extensive series of papers (Tadross 2008a(Tadross ,b, 2009a(Tadross ,b, 2011(Tadross , 2012Tadross & Nasser 2010;Tadross et al 2012) by the working group of A. L. Tadross (hereafter T08) using 2MASS, JHK s photometry to derive cluster parameters mainly of, at that time, unstudied aggregates. They fitted isochrones to J versus (J − H) and K s versus (J − K s ) diagrams.…”

Section: The Data Compilationmentioning

confidence: 99%

A comparative study on the reliability of open cluster parameters

Netopil

Paunzen

Carraro

2015

A&A

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Context. Open clusters are known as excellent tracers of the structure and chemical evolution of the Galactic disk, however, the accuracy and reliability of open cluster parameters is poorly known. Aims. In recent years, several studies aimed to present homogeneous open cluster parameter compilations, which are based on some different approaches and photometric data. These catalogues are excellent sources to facilitate testing of the actual accuracy of open cluster parameters. Methods. We compare seven cluster parameter compilations statistically and with an external sample, which comprises the mean results of individual studies. Furthermore, we selected the objects IC 4651, NGC 2158, NGC 2383, NGC 2489, NGC 2627, NGC 6603, and Trumpler 14, with the main aim to highlight differences in the fitting solutions. Results. We derived correction terms for each cluster parameter, using the external calibration sample. Most results by the compilations are reasonable scaled, but there are trends or constant offsets of different degree. We also identified one data set, which appears too erroneous to allow adjustments. After the correction, the mean intrinsic errors amount to about 0.2 dex for the age, 0.08 mag for the reddening, and 0.35 mag for the distance modulus. However, there is no study that characterises the cluster morphologies of all test cases in a correct and consistent manner. Furthermore, we found that the largest compilations probably include at least 20 percent of problematic objects, for which the parameters differ significantly. These could be among others doubtful or unlikely open clusters that do not facilitate an unambiguous fitting solution.

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“…However, it is useful to re-investigate the properties and structures of the Milky Way Galaxy using the most recent Near-IR JHK S photometric data from the 2-Micron All Sky Survey (2MASS ) Point Source Catalogue of Skrutskie et al (2006). In this context, we used a sample of 263 open star clusters (most of them are studied for the first time) that have been analysed by the author, in a series of papers; Tadross (2008Tadross ( ∼ 2012; see Tables 1 and 2. Our aim is to repeat the work we have done 12 years ago, Tadross 2001 andTadross et al 2002, to study such relations using NIR observations instead of UBV.…”

Section: Introductionmentioning

confidence: 99%

The astrophysical behavior of open clusters along the Milky Way Galaxy

Tadross

2014

NRIAG Journal of Astronomy and Geophysics

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The main aim of this paper is to study the astrophysical behaviour of open clusters' properties along the Milky Way Galaxy. Near-IR JHK S (2MASS) photometry has been used for getting a homogeneous Catalog of 263 open clusters' parameters, which are randomly selected and studied by the author through the last five years; most of them were studied for the first time. The correlations between the astrophysical parameters of these clusters have been achieved by morphological way and compared with the most recent works.ª 2014 Production and hosting by Elsevier B.V. on behalf

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Astrophysical parameters of ten poorly studied open star clusters

Cited by 4 publications

References 30 publications

Complex Stellar System ESO65SC03: Open Cluster or Remnant?

Complex Stellar System ESO65SC03: Open Cluster or Remnant?

A comparative study on the reliability of open cluster parameters

The astrophysical behavior of open clusters along the Milky Way Galaxy

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