Astrophysical Bulletin

, Volume 62, Issue 3, pp 209–216 | Cite as

A globular cluster in the dwarf galaxy Sextans B

Article

Abstract

We present spectroscopic observations of a massive globular cluster in the dwarf irregular galaxy Sextans B, discovered by us on the Hubble Space Telescope Wide Field and Planetary Camera 2 (HST WFPC2) images. Long-slit spectra were obtained with the SCORPIO spectrograph on the 6-m telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences. We determine the age, metallicity and alpha-element abundance ratio for the globular cluster to be 2 ± 1 Gyr, −1.35 ±0.25 dex, and 0.1 ± 0.1 dex, respectively. Main photometric and structural parameters of it were determined using our surface photometry on the HST images. The mass (∼105M⊙), luminosity and structural parameters appear to be typical of the globular clusters in our own Galaxy. Our findings shed new light on the evolutionary history of Sextans B.

PACS numbers

98.52.Wz 98.20.Jp 

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References

  1. 1.
    B. G. Elmegreen, Yu. N. Efremov, Astrophys. J. 480, 235 (1997).CrossRefADSGoogle Scholar
  2. 2.
    S. Larsen, T. Richtler, Astronom. and Astrophys. 354, 836 (2000).ADSGoogle Scholar
  3. 3.
    A. Dekel, J. Silk, Astrophys. J. 303, 39 (1986).CrossRefADSGoogle Scholar
  4. 4.
    E. K. Grebel, J. S. Gallagher III, D. Harbeck, Astronom. J. 125, 1926 (2003).CrossRefADSGoogle Scholar
  5. 5.
    J. Einasto, E. Saar, A. Kaasik, A. D. Chernin, Nature 252, 111, (1974).CrossRefADSGoogle Scholar
  6. 6.
    S. van den Bergh, Astrophys. J. 517, L97 (1999).CrossRefADSGoogle Scholar
  7. 7.
    R. B. Tully, R. S. Sommerville, N. Trentham, M. A. Verheijen, Astrophys. J. 569, 573 (2002).CrossRefADSGoogle Scholar
  8. 8.
    M. E. Sharina, I. D. Karachentsev, A. E. Dolphin, et al., Monthly Notices Roy. Astronom. Soc.(in prep.) (2007).Google Scholar
  9. 9.
    I. D. Karachentsev, M. E. Sharina, D. I. Makarov, A. E. Dolphin, et al., Astronom. and Astrophys. 389, 812 (2002).CrossRefADSGoogle Scholar
  10. 10.
    G. Stasinska, G. Comte, L. Vigroux, Astronom. and Astrophys. 154, 352 (1986).ADSGoogle Scholar
  11. 11.
    E. D. Skillman, R. C. Kennicutt, P. W. Hodge, Astrophys. J. 347, 875 (1989).CrossRefADSGoogle Scholar
  12. 12.
    M. Moles, A. Aparicio, J. Masegosa, Astronom. and Astrophys. 228, 310 (1990).ADSGoogle Scholar
  13. 13.
    A. Y. Kniazev, E. K. Grebel, S. A. Pustilnik, A. G. Pramskij, D. B. Zucker, Astronom. J. 130, 1558 (2005).CrossRefADSGoogle Scholar
  14. 14.
    M. Tosi, L. Gregio, G. Marconi, P. Focardi, Astronom. J. 102, 951 (1991).CrossRefADSGoogle Scholar
  15. 15.
    S. Sakai, B. F. Madore, W. L. Freedman, Astrophys. J. 480, 589 (1997).CrossRefADSGoogle Scholar
  16. 16.
    M. Mateo, ARA&A 36, 435 (1998).CrossRefADSGoogle Scholar
  17. 17.
    A. E. Dolphin, D. R. Weisz, E. D. Skillman, J. A. Holtzman, astro-ph/0506430.Google Scholar
  18. 18.
    W. E. Harris, S. van den Bergh, Astronom. J. 86, 1627 (1981).CrossRefADSGoogle Scholar
  19. 19.
    M. E. Sharina, T. H. Puzia, D. I. Makarov, Astronom. and Astrophys. 442, 85 (2005).CrossRefADSGoogle Scholar
  20. 20.
    V. L. Afanasiev, A. V. Moiseev, Astron. Lett. 31, 194 (2005).CrossRefADSGoogle Scholar
  21. 21.
    G. Worthey, Astrophys. J. Suppl. 95, 107 (1994).CrossRefADSGoogle Scholar
  22. 22.
    K. Banse, Ph. Crane, Ch. Ounnas, D. Ponz, MIDAS, in Proc. of DECUS (Zurich, 1983), p. 87.Google Scholar
  23. 23.
    J. Oke, Astronom. J. 99, 1621 (1990).CrossRefADSGoogle Scholar
  24. 24.
    M. E. Sharina, V. L. Afanasiev, T. H. Puzia, Astron. Lett. 32, 185 (2006).CrossRefADSGoogle Scholar
  25. 25.
    T. H. Puzia, R. P. Saglia, M. Kissler-Patig, et al., Astronom. and Astrophys. 395, 45 (2002).CrossRefADSGoogle Scholar
  26. 26.
    M. E. Sharina, V. L. Afanasiev, T. H. Puzia, Monthly Notices Roy. Astronom. Soc. 372, 1259 (2006).CrossRefADSGoogle Scholar
  27. 27.
    D. Thomas, C. Maraston, R. Bender, Monthly Notices Roy. Astronom. Soc. 339, 897 (2003).CrossRefADSGoogle Scholar
  28. 28.
    T. H. Puzia, M. Kissler-Patig, D. Thomas, et al., Astronom. and Astrophys. 439, 997 (2005).CrossRefADSGoogle Scholar
  29. 29.
    T. H. Puzia, M. Kissler-Patig, P. Goudfrooij, Astrophys. J. 648, 383 (2006)CrossRefADSGoogle Scholar
  30. 30.
    A.E. Dolphin, A. Saha, E. D. Skillman, R. C. Dohm-Palmer, E. Tolstoy, A. A. Cole, J. S. Gallagher, J. G. Hoessel, M. Mateo, Astronom. J. 126, 187 (2003).CrossRefADSGoogle Scholar
  31. 31.
    M. Asplund, N. Grevesse, A. J. Sauval, C. Allende Prieto, D. Kiselman, Astronom. and Astrophys. 417, 751 (2004).CrossRefADSGoogle Scholar
  32. 32.
    G. Bruzual, S. Charlot, Monthly Notices Roy. Astronom. Soc. 344, 1000 (2003).CrossRefADSGoogle Scholar
  33. 33.
    D. E. McLaughlin, Astronom. J. 117, 2398 (1999).CrossRefADSGoogle Scholar
  34. 34.
    C. M. Springob, M. P. Haynes, R. Giovanelli, B. R. Kent, Astrophys. J. Suppl. 160, 149 (2005).CrossRefADSGoogle Scholar
  35. 35.
    I. D. Karachentsev, V. E. Karachentseva, W. H. Huchtmeier, D. I. Makarov, Astronom. J. 127, 2031 (2004).CrossRefADSGoogle Scholar
  36. 36.
    E. F. Bell, R. S. de Jong, Astrophys. J. 550, 212, (2001)CrossRefADSGoogle Scholar
  37. 37.
    W. E. Harris, in Star Clusters, Saas-Fee Advanced Course 28. Lecture Notes 1998, Swiss Society for Astrophysics and Astronomy, Ed. by L. Labhardt and B. Binggeli (Springer-Verlag, Berlin, 2001).Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  1. 1.Special Astrophysical ObservatoryRussian Academy of SciencesNizhnij ArkhyzRussia
  2. 2.Astronomy department of the Kazan State UniversityKazanRussia

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