Astronomy Letters

, Volume 44, Issue 4, pp 220–235 | Cite as

Determining the Absolute Magnitudes of Galactic-Bulge Red Clump Giants in the Z and Y Filters of the Vista Sky Surveys and the IRAC Filters of the Spitzer Sky Surveys

  • D. I. Karasev
  • A. A. Lutovinov


The properties of red clump giants in the central regions of the Galactic bulge are investigated in the photometric Z and Y bands of the infrared VVV (VISTA/ESO) survey and the [3.6], [4.5], [5.8], and [8.0] μm bands of the GLIMPSE (Spitzer/IRAC) Galactic plane survey. The absolute magnitudes for objects of this class have been determined in these bands for the first time: M Z = −0.20 ± 0.04, M Y = −0.470 ± 0.045, M[3.6] = −1.70 ± 0.03, M[4.5] = −1.60 ± 0.03, M[5.8] = −1.67 ± 0.03, and M[8.0] = −1.70 ± 0.03. A comparison of the measured magnitudes with the predictions of theoretical models for the spectra of the objects under study has demonstrated good mutual agreement and has allowed some important constraints to be obtained for the properties of bulge red clump giants. In particular, a comparison with evolutionary tracks has shown that we are dealing predominantly with the high-metallicity subgroup of bulge red clump giants. Their metallicity is slightly higher than has been thought previously, [M/H] ≃ 0.40 (Z ≃ 0.038) with an error of [M/H] ≃ 0.1 dex, while the effective temperature is 4250± 150 K. Stars with an age of 9–10 Gyr are shown to dominate among the red clump giants, although some number of younger objects with an age of ~8 Gyr can also be present. In addition, the distances to several Galactic bulge regions have been measured, as D = 8200–8500 pc, and the extinction law in these directions is shown to differ noticeably from the standard one.


stars red clump giants absolute magnitudes Galactic bulge interstellar extinction VISTA Spitzer. 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. Alonso-Garcia, D.Minniti,M. Catelan, R. Ramos, O. Gonzalez, M. Hempel, P. Lukas, R. Saito, et al., arXiv:1710.04854v1 (2017).Google Scholar
  2. 2.
    D. R. Alves, Astrophys J. 539, 732 (2000).ADSCrossRefGoogle Scholar
  3. 3.
    T.-L. Astraatmadja and C. A. L. Bailer-Jones, Astrophys. J. 833, 119 (2016).ADSCrossRefGoogle Scholar
  4. 4.
    T. Bensby, J. C. Yee, S. Feltzing, J. A. Johnson, A. Gould, J. G. Cohen, M. Asplund, J. Melendez, et al., Astron. Astrophys. 549, 147 (2013).CrossRefGoogle Scholar
  5. 5.
    A. Bhardwaj, M. Rejkuba, D. Minniti, F. Surot, E. Valenti, M. Zoccali, O. A. Gonzalez, M. Romaniello, et al., Astron. Astrophys. 605, id.A100 (2017).Google Scholar
  6. 6.
    P. A. Boldin, S. S. Tsygankov, and A. A. Lutovinov, Astron. Lett. 39, 375 (2013).ADSCrossRefGoogle Scholar
  7. 7.
    A. Bressan, P. Marigo, L. Girardi, B. Salasnich, C. dal Cero, S. Rubele, and A. Nanni, Mon. Not. R. Astron. Soc. 427, 127 (2012). Scholar
  8. 8.
    J. A. Cardelli, G. C. Clayton, and J. S. Mathis, Astrophys J. 345, 245 (1989).ADSCrossRefGoogle Scholar
  9. 9.
    M. Cohen, Wm. A. Wheaton, and S. T. Megeath, Astrophys J. 126, 1090 (2003).ADSGoogle Scholar
  10. 10.
    C. M. Dutra, B. X. Santiago, E. L. D. Bica, and B. Barbuy, Mon. Not. R. Astron. Soc. 338, 253 (2003).ADSCrossRefGoogle Scholar
  11. 11.
    O. Gerhard and I. Martinez-Valpuesta, Astrophys. J. Lett. 744, L8 (2012).ADSCrossRefGoogle Scholar
  12. 12.
    L. Girardi, Mon. Not. R. Astron. Soc. 308, 818 (1999).ADSCrossRefGoogle Scholar
  13. 13.
    L. Girardi, Ann. Rev. Astron. Astrophys. 54, 95 (2016).ADSCrossRefGoogle Scholar
  14. 14.
    G. A. Gontcharov, Astron. Lett. 43, 545 (2017).ADSCrossRefGoogle Scholar
  15. 15.
    G. A. Gontcharov, Astron. Lett. 34, 785 (2008).ADSCrossRefGoogle Scholar
  16. 16.
    G. A. Gontcharov, Astron. Lett. 38, 12 (2012).ADSCrossRefGoogle Scholar
  17. 17.
    G. A. Gontcharov and A. T. Baykova, Astron. Lett. 39, 689 (2013).ADSCrossRefGoogle Scholar
  18. 18.
    O. A. Gonzalez, M. Rejkuba, M. Zoccali, E. Valenti, D. Minniti, M. Schultheis, R. Tobar, and B. Chen, Astron. Astrophys. 552, 9 (2012).Google Scholar
  19. 19.
    O. A. Gonzalez, M. Zoccali, S. Vasquez, V. Hill, M. Rejkuba, and E. Valenti, Astron. Astrophys. 584, A46 (2015).CrossRefGoogle Scholar
  20. 20.
    D. I. Karasev, A. A. Lutovinov, and R. A. Burenin, Mon. Not. R. Astron. Soc. Lett. 409, L69 (2010a).ADSCrossRefGoogle Scholar
  21. 21.
    D. I. Karasev, M. G. Revnivtsev, A. A. Lutovinov, and R. A. Burenin, Astron. Lett. 36, 788 (2010b).ADSCrossRefGoogle Scholar
  22. 22.
    D. I. Karasev, S. S. Tsygankov, and A. A. Lutovinov, Astron. Lett. 41, 394 (2015).ADSCrossRefGoogle Scholar
  23. 23.
    C. D. Laney, M. D. Joner, and G. Pietrzynski, Mon. Not. R. Astron. Soc. 419, 1637 (2012).ADSCrossRefGoogle Scholar
  24. 24.
    P. Marigo, L. Girardi, A. Bressan, Ph. Rosenfield, B. Aringer, Yang Chen, M. Dussin, A. Nanni, et al., Astrophys J. 835, 77 (2017).ADSCrossRefGoogle Scholar
  25. 25.
    D. M. Nataf, A. Gould, P. Fouqué, O. A. Gonzalez, J. A. Johnson, J. Skowron, A. Udalski, M. K. Szymanski, et al., Astrophys J. 769, 88 (2013).ADSCrossRefGoogle Scholar
  26. 26.
    D. M. Nataf, O. A. Gonzalez, L. Casagrande, G. Zasowski, C. Wegg, C. Wolf, A. Kunder, J. Alonso-Garcia, et al., Mon. Not. R. Astron. Soc. 456, 2692 (2016).ADSCrossRefGoogle Scholar
  27. 27.
    S. Nishiyama, M. Tamura, H. Hatano, D. Kato, T. Tanabe, K. Sugitani, and T. Nagata, Astrophys J. 696, 1407 (2009).ADSCrossRefGoogle Scholar
  28. 28.
    B. Paczynski and K. Stanek, Astron. Astrophys. 494, 219 (1998).Google Scholar
  29. 29.
    P. Popowski, Astrophys J. 528, 9 (2000).ADSCrossRefGoogle Scholar
  30. 30.
    M. Revnivtsev, M. van den Berg, R. Burenin, J. E. Grindlay, D. Karasev, and W. Forman, Astron. Astrophys. 515, A49 (2010).CrossRefGoogle Scholar
  31. 31.
    T. Sumi, Mon. Not. R. Astron. Soc. 349, 193 (2004).ADSCrossRefGoogle Scholar
  32. 32.
    A. Udalski, Astrophys. J. 590, 284 (2003).ADSCrossRefGoogle Scholar
  33. 33.
    E. Vanhollebeke, M. A. T. Groenewegen, and L. Girardi, Astron. Astrophys. 498, 95 (2009).ADSCrossRefGoogle Scholar
  34. 34.
    M.Zoccali, A. Renzini, S. Ortolani, L. Greggio, I. Saviane, S. Cassisi, M. Rejkuba, B. Barbuy, R. M. Rich, and E. Bica, Astron. Astrophys. 399, 931 (2003).ADSCrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  1. 1.Space Research InstituteRussian Academy of SciencesMoscowRussia

Personalised recommendations