A spectroscopic survey of FHB stars near the south galactic pole

Silvia Rossi, Roberto Ortiz, Ronald Wilhelm, Roberto Costa, Timothy C. Beers

Research output: Contribution to journalArticlepeer-review


We present the results of a medium-resolution spectroscopic survey of 43 field horizontal-branch (FHB) candidates carried out near the south galactic pole, selected from the original list of FHB candidates compiled by Beers et al. (2007). The observation list includes only stars classified as "high-probability" candidates, according to their 2MASS infrared colours. Atmospheric parameters of some stars have been obtained by comparing some spectral features with theoretical models provided by Kurucz (1993). A comparison between the grid of model atmospheres with some parameters of the Hδ line allowed the determination of log g, whilst [Fe/H] was estimated by the equivalent widths of the MgΠ 4481 and CaΠ lines. About 77% of the sample have been classified as FHB stars, 10% as subdwarfs, whilst the remaining 13% are probably main-sequence A-type stars far from the Galactic plane.

Original languageEnglish
Pages (from-to)422-423
Number of pages2
JournalProceedings of the International Astronomical Union
Issue numberS262
StatePublished - Aug 2009


  • Galaxy: halo
  • Galaxy: stellar content
  • Stars: horizontal-branch

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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