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The Age of the Galactic Inner Halo

Published online by Cambridge University Press:  07 August 2017

Laura Kellar Fullton  and
Bruce W. Carney
Laura Kellar Fullton
Affiliation:
Dept. of Physics & Astronomy, University of North Carolina, CB # 3255 Phillips Hall, Chapel Hill, NC 27599-3255
Bruce W. Carney
Affiliation:
Dept. of Physics & Astronomy, University of North Carolina, CB # 3255 Phillips Hall, Chapel Hill, NC 27599-3255

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Are the inner regions of the Galaxy younger, older or the same age as the outer halo? We have undertaken a study of globular clusters which lie within 4–5 kpc of the Galactic center. Here we present results for three of these clusters: NGC 6723, NGC 6352 and NGC 5927. We have constructed cluster color-magnitude diagrams from which we have determined their ages using the magnitude difference between the horizontal branch and main-sequence turnoff following the procedure of Carney, Storm & Jones (1992, CSJ). We find that 47 Tuc, NGC 6352 and NGC 6723 are coeval to within the errors, while NGC 5927 appears younger. The figure below is a reproduction of Figure 20 of CSJ with our clusters added.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 398
Copyright
Copyright © Kluwer 1995 

References

Carney, B. W., Storm, J. and Jones, R. V. 1992. ApJ, 386, 386 (CSJ) CrossRefGoogle Scholar