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2015 | 69 | 1 | 7-20
Tytuł artykułu

Radial Distribution Of Stars In Globular Clusters Inferred From The Monte Carlo Approach

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
In this paper we try to reconstruct the spatial distribution of stars in globular clusters (GCs) from heuristic statistical ideas. Such 3D radial distributions are important for understanding physical conditions across the clusters. Our method is based on converting spherically symmetrical functions such as exp(-r2/s2), exp(-r/s), 1/(1 + r2/s2)2 and 1/(1 + r2/s2)m, (s and m are parameters) to 2D star distributions in a GCs by the Monte Carlo method. By comparing the obtained 2D profiles with observational ones we demonstrate that Gaussian or exponential distribution functions yield too short extensions of periph-eral parts of the GCs profiles. The best candidate for fitting GCs profiles has been found to be the generalized Schuster density law: C/ (1 + r2/s2)m, where C is the normalization constant and s and m are adjustable parameters. These parameters display a nonlinear correlation with s varying from 0.1 to 10 pc, whilst m is close to 2. Using this law the radiation temperatures across M 13 and 47 Tucane were estimated.
Wydawca

Rocznik
Tom
69
Numer
1
Strony
7-20
Opis fizyczny
Daty
wydano
2015-03-01
online
2015-03-13
Twórcy
  • Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
Bibliografia
  • 1. Struve O. and Zebergs V. (1962) Astronomy of the 20th Century, Macmillan Co.
  • 2. Ferraro F.R., Exotic Populations in Galactic Globular Clusters, in: The Impact of HST on European Astronomy, Astrophysics and Space Science Proceedings, Springer Science + Business Media B.V., 2010, p. 51.
  • 3. Piotto, G., 2010. Observational Evidence of Multiple Stellar Populations in Star Clusters, PKAS 25, 91.
  • 4. Chandrasekhar S. (1960) Principles of Stellar Dynamics, Dover, New York.
  • 5. Plummer H.C. (1911). On the problem of distribution in globular stars clusters, Monthly Notes LXXI, 5, 460-470.
  • 6. Dicke R. H. (1939) The radial distribution in globular clusters, Astronomical J. 1111, 108-110.
  • 7. Catalogue of Milky Way Globular Cluster Parameters, http://www.physics.mcmaster.ca/Globular.html
  • 8. Catalog of Parameters for Milky Way Globular Clusters: The Database Compiled by William E. Harris, McMaster University, This revision: December 2010 http://physwww.physics.mcmaster.ca/~harris/mwgc.dat
  • 9. Miocchi P., Lanzoni B., Ferraro F. R., Dalessandro E., Vesperini E., Pasquato M., Beccari G., Pallanca C., and Sanna N. (2013) Star count density profiles and structural parameters of 26 galactic globular clusters, The Astrophysical Journal, 774, 151 (16pp). [WoS]
  • 10.Ninković S. (1998) On the generalized Schuster density law, Serbian Astronomical Journal 158, 15-21.
  • 11. Živkov, V. and Ninkovic, S. (1998) On the generalized Schuster density law and King’s formula , Serbian Astronomical Journal 158, 7-11.
  • 12. Von Lohmann W. (1964) Dichtegesetze und mittlere Sterngeschwindigkeiten in Sternhaufen, Z. Astrophys. 60, 43-56.
  • 13. McLaughlin Dean E. and van der Marel Roeland P., Resolved massive star clusters in the Milky Way and its satellites: brightness profiles and a catalog of fundamental parameters, The Astrophysical Journal Supplement Series 161, 304-360, December 2005.
  • 14. Elson R. A. W., Fall S. M. and Freeman K. C. (1987) The structure of young star clusters in the Large Magellanic Cloud, The Astrophysical Journal 323, 54-78.
  • 15. Diederik Kruijssen J. M., Mieske S.. The mass-to-light ratios of Galactic Globular Clusters. To appear in the proceedings of "Galaxy Wars: Stellar Populations and Star Formation in Interacting Galaxies" (Tennessee, July 2009), arXiv:0910.4773
  • 16. Freire P. C., Kramer M., Lyne A. G., Camilo F., Manchester R. N., D’Amico N. (2001) Detection of ionized gas in the globular cluster 47 Tucanae, The Astrophysical Journal 557, L105-L108.
  • 17. King, I., R. (1966) The structure of star clusters. III. Some simple dynamical models, Astronomical Journal 71, 64-75.
  • 18. Naim S., Griv E. (2012) Examining the M67 classification as an open cluster, IJAA 2:167-173.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_1515_physica-2015-0001
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