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The Distribution of Field Horizontal–Branch Stars in the Galactic Halo

  • A. G. Davis Philip (a1)

Extract

Since the time allowed per paper at this joint discussion is short only one aspect of the stellar distribution at high galactic latitudes will be presented here, namely the distribution of field horizontal-branch stars (FHB) in the galactic halo. First, the method by which FHB stars are found will be described. Second, the density distribution of FHB stars will be compared with that of the RR Lyrae stars.

As part of a general program to study the stellar density distribution perpendicular to the galactic plane a number of possible FHB stars has been discovered. In each survey area objective prism plates (at a dispersion of 280 Å/mm. to a limiting magnitude of V = 14) are taken with the Michigan Curtis Schmidt telescope at Cerro Tololo Inter-American Observatory or the Schmidt telescope at the Warner and Swasey Observatory. A set of direct plates are taken also to obtain photographic magnitudes for the stars with spectral classifications.

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Copyright

References

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Danford, S. C. 1976, Thesis, Yale University.
Kinman, T. D., Wirtanen, C. A., and Janes, K. A. 1966, Ap. J. Supp. 13, 379.
Oke, J. B., Greenstein, J. L., and Gunn, J. 1966, Stellar, Evolution, R.F., Stein and A.G.W., Cameron eds., (Plenum Press: New York) p. 399.
Philip, A. G. D. 1973, Spectral Classification and Multicolor Photometry, Ch., Fehrenbach and B.E., Westerlund eds., (Reidel: Dordrecht) p. 230.
Upgren, A. R. 1962, A.J. 67, 37.
Upgren, A. R. 1963, A.J. 6, 475.

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