A survey of early-type stars based on the two micron all sky survey database

R. Ortiz, M. Malacarne, R. Wilhelm, R. D.D. Costa, S. Rossi, W. J. Maciel, A. F.M. Costa

Research output: Contribution to journalReview articlepeer-review

4 Scopus citations


We report the results of a spectroscopic survey of blue stars near the south Galactic pole, selected according to their color indices in the 2MASS database. The main scope of this work is to determine the nature of the objects that comprise the sample. Some characteristics of the Hβ, Hγ, and Hδ lines which are sensitive to temperature and gravity were measured and eventually compared with a grid of model atmospheres to obtain Teff and log g. In some cases the data allowed a unique, reliable classification of the star. Among the 44 stars studied, 5 objects are reliably classified as subdwarfs, 12 as A-type stars, and 3 as field horizontal-branch (FFTB) stars. The remaining objects are either A or FHB stars, but additional observations are necessary to distinguish between these two types. Neither degenerate nor low-gravity stars (post-AGB) have been identified in the sample.

Original languageEnglish
Pages (from-to)1183-1194
Number of pages12
JournalAstronomical Journal
Issue number3
StatePublished - Sep 2007


  • Galaxy: Halo
  • Galaxy: stellar content
  • Stars: early-type
  • Stars: horizontal-branch
  • Subdwarfs
  • Surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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