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Distant field blue horizontal branch stars and the mass of the Galaxy - II. Photometry and spectroscopy of UKST candidates 16 < B < 19.5, 11 < R < 52 kpc

Clewley, L. ; Warren, S. J. ; Hewett, P. C. ; Norris, John E. ; Evans, N. W.

Monthly notices of the Royal Astronomical Society, 2004-07, Vol.352 (1), p.285-298 [Periódico revisado por pares]

23 Ainslie Place , Edinburgh EH3 6AJ , UK . Telephone 226 7232 Fax 226 3803: Blackwell Science Ltd

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  • Título:
    Distant field blue horizontal branch stars and the mass of the Galaxy - II. Photometry and spectroscopy of UKST candidates 16 < B < 19.5, 11 < R < 52 kpc
  • Autor: Clewley, L. ; Warren, S. J. ; Hewett, P. C. ; Norris, John E. ; Evans, N. W.
  • Assuntos: Astronomy ; Characteristics and properties of the milky way ; Earth, ocean, space ; Exact sciences and technology ; Galactic halo ; Galaxy: halo ; Normal stars (by class): general or individual ; Population ii stars (horizontal branch, metal poor, etc.) ; Stars ; stars: horizontal branch ; Stellar systems. Galactic and extragalactic objects and systems. The universe
  • É parte de: Monthly notices of the Royal Astronomical Society, 2004-07, Vol.352 (1), p.285-298
  • Notas: ArticleID:MNR7921
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  • Descrição: ABSTRACT This is the second in a series of papers presenting a new calculation of the mass of the Galaxy based on radial velocities and distances for a sample of faint 16 < B < 21.3 field blue horizontal‐branch (BHB) stars. We present accurate BV CCD photometry and spectra for 142 candidate A‐type stars selected from ubjr photometry of UK Schmidt telescope plates in six high‐Galactic‐latitude fields. Classification of these candidates produces a sample of 60 BHB stars at distances of 11–52 kpc from the Sun (mean 28 kpc), with heliocentric line‐of‐sight velocities accurate to 15 km s−1, and distance errors <10 per cent. We provide a summary table listing coordinates and velocities of these stars. The measured dispersion of the radial component of the Galactocentric velocity for this sample is 108 ± 10 km s−1, in agreement with a recent study of the distant halo by Sirko and coworkers. Measurements of the Ca ii K line indicate that nearly all the stars are metal‐poor with a mean [Fe/H]=−1.8 with dispersion 0.5. Subsequent papers will describe a second survey of BHBs to heliocentric distances 70 < R < 125 kpc and present a new estimate of the mass of the Galaxy.
  • Editor: 23 Ainslie Place , Edinburgh EH3 6AJ , UK . Telephone 226 7232 Fax 226 3803: Blackwell Science Ltd
  • Idioma: Inglês
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