scholarly journals Features of Chemical-Element Abundances in Open Star Clusters of the Galaxy

2016 ◽  
Vol 25 (1) ◽  
pp. 1-9
Author(s):  
V. A. Marsakov ◽  
V. V. Koval’ ◽  
M. L. Gozha ◽  
L. V. Shpigel’
Keyword(s):  
Neutron Capture ◽  
Chemical Elements ◽  
Star Clusters ◽  
Slow Neutron ◽  
Open Star Clusters ◽  
Element Abundances ◽  
Open Star ◽  
The Galaxy ◽  
Relative Abundances ◽  
High Metallicity

AbstractOn the basis of the authors’ compiled catalog containing spectroscopic abundances of 14 chemical elements for 90 open star clusters of the Galaxy, we show that in the young clusters not only barium but also three other studied elements of slow neutron-capture, Y, La, and Ce, reveal higher relative abundances than those in the field stars, with differences beyond the error limits. We also find that, at high metallicity ([Fe/H]> −0.1), the relative abundances of the

scholarly journals Determination of Abundances of Chemical Elements in Open Star Clusters of the Galaxy

2016 ◽  
Vol 25 (1) ◽  
Author(s):  
M. L. Gozha ◽  
V. V. Koval’ ◽  
V. A. Marsakov
Keyword(s):  
Chemical Elements ◽  
Star Clusters ◽  
Open Star Clusters ◽  
Open Star ◽  
The Galaxy ◽  
Nuclear Synthesis ◽  
Relative Abundances ◽  
Using Data

AbstractSpectroscopic determinations of the relative abundances of chemical elements produced in different nuclear-synthesis processes, [el/Fe], are collected for 90 open star clusters of the Galaxy using data from 109 papers published between 1991 and 2015. Information is gathered on the abundances of

scholarly journals Galactic Rotation From Young Open Star Clusters

1980 ◽  
Vol 85 ◽  
pp. 125-127
Author(s):  
H. M. Maitzen ◽  
A.F.J. Moffat ◽  
Th. Schmidt-Kaler
Keyword(s):  
Angular Velocity ◽  
Rotation Curve ◽  
Star Clusters ◽  
Galactic Rotation ◽  
Open Star Clusters ◽  
Open Star ◽  
The Galaxy ◽  
Young Clusters ◽  
Image Position

The rotation of the Galaxy can best be studied with the aid of tracers for which distance and velocity can be obtained simultaneously, accurately and unambiguously out to large distances. Clearly, the best objects are the very young clusters. The local gradient of the angular velocity is contained in Oort's constant and, due e.g. to perturbations from spiral features, may not reflect the smoothly varying, underlying global component of rotation. Thus, it is necessary to reach out as far as possible in order to allow a smoothing of the rotation curve.

scholarly journals Characterizing the companion AGBs using surface chemical composition of barium stars

2019 ◽  
Vol 492 (3) ◽  
pp. 3708-3727 ◽  
Author(s):  
J Shejeelammal ◽  
Aruna Goswami ◽  
Partha Pratim Goswami ◽  
Rajeev Singh Rathour ◽  
Thomas Masseron
Keyword(s):  
Neutron Capture ◽  
Detailed Comparison ◽  
Slow Neutron ◽  
Asymptotic Giant Branch ◽  
Agb Stars ◽  
Capture Process ◽  
Origin And Evolution ◽  
Element Abundances ◽  
The Galaxy ◽  
Low Mass

ABSTRACT Barium stars are one of the important probes to understand the origin and evolution of slow neutron-capture process elements in the Galaxy. These are extrinsic stars, where the observed s-process element abundances are believed to have an origin in the now invisible companions that produced these elements at their asymptotic giant branch (AGB) phase of evolution. We have attempted to understand the s-process nucleosynthesis, as well as the physical properties of the companion stars through a detailed comparison of observed elemental abundances of 10 barium stars with the predictions from AGB nucleosynthesis models, FRUITY. For these stars, we have presented estimates of abundances of several elements, C, N, O, Na, Al, α-elements, Fe-peak elements, and neutron-capture elements Rb, Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, and Eu. The abundance estimates are based on high resolution spectral analysis. Observations of Rb in four of these stars have allowed us to put a limit to the mass of the companion AGB stars. Our analysis clearly shows that the former companions responsible for the surface abundance peculiarities of these stars are low-mass AGB stars. Kinematic analysis has shown the stars to be members of Galactic disc population.

scholarly journals Two populations of open star clusters in the Galaxy

2012 ◽  
Vol 38 (8) ◽  
pp. 519-530 ◽  
Author(s):  
M. L. Gozha ◽  
V. V. Koval’ ◽  
V. A. Marsakov
Keyword(s):  
Star Clusters ◽  
Open Star Clusters ◽  
Open Star ◽  
The Galaxy ◽  
Two Populations

scholarly journals Open star clusters and Galactic structure

2017 ◽  
Vol 12 (S330) ◽  
pp. 227-228
Author(s):  
Yogesh C. Joshi
Keyword(s):  
Galactic Disk ◽  
Mass Density ◽  
Star Clusters ◽  
Galactic Structure ◽  
Open Clusters ◽  
Open Star Clusters ◽  
Open Star ◽  
Estimated Parameters ◽  
The Galaxy ◽  
Age Relations

AbstractIn order to understand the Galactic structure, we perform a statistical analysis of the distribution of various cluster parameters based on an almost complete sample of Galactic open clusters yet available. The geometrical and physical characteristics of a large number of open clusters given in the MWSC catalogue are used to study the spatial distribution of clusters in the Galaxy and determine the scale height, solar offset, local mass density and distribution of reddening material in the solar neighbourhood. We also explored the mass-radius and mass-age relations in the Galactic open star clusters. We find that the estimated parameters of the Galactic disk are largely influenced by the choice of cluster sample.

scholarly journals Heterogeneity of the population of open star clusters in the Galaxy

2012 ◽  
Vol 38 (8) ◽  
pp. 506-518 ◽  
Author(s):  
M. L. Gozha ◽  
T. V. Borkova ◽  
V. A. Marsakov
Keyword(s):  
Star Clusters ◽  
Open Star Clusters ◽  
Open Star ◽  
The Galaxy

scholarly journals Unresolved binaries in open clusters

2020 ◽  
pp. 351-357
Author(s):  
О.И. Бородина ◽  
Д.А. Ковалева
Keyword(s):  
Binary Stars ◽  
European Space Agency ◽  
Star Clusters ◽  
Space Mission ◽  
Open Clusters ◽  
Open Star Clusters ◽  
Open Star ◽  
Space Agency ◽  
The Galaxy ◽  
Using Data

Проведено исследование популяции двойных звезд в рассеянных звездных скоплениях Галактики с использованием данных космической миссии Европейского космического агентства Gaia. Разработаны две независимые методики определения доли неразрешенных двойных звезд в рассеянных звездных скоплениях. Методики исследованы на моделях скоплений, изучены их возможности и ограничения с учетом особенностей наблюдательных данных. Сделаны оценки доли неразрешенных двойных звезд в скоплениях NGC 2516 и NGC 2447. A study of the binary stars population in open star clusters in the Galaxy was carried out using data from the Gaia space mission of the European Space Agency. Two independent methods have been developed for determining the fraction of unresolved binary stars in open clusters. The techniques were studied on the models of clusters, their capabilities and limitations were studied taking into account the peculiarities of the observational data. The unresolved stars fraction was estimated for the clusters NGC 2516 and NGC 2447.

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