A Survey of Early-Type Stars Based on the Two Micron All Sky Survey Database

Details A Survey of Early-Type Stars Based on the Two Micron All Sky Survey Database A Survey of Early-Type Stars Based on the Two Micron All Sky Survey Database

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aj....134.1183o&link_type=abstract

The Astronomical Journal, Volume 134, Issue 3, pp. 1183-1194 (2007).

Astronomy and Astrophysics

Astronomy

3

Galaxy: Halo, Galaxy: Stellar Content, Stars: Early-Type, Stars: Horizontal-Branch, Subdwarfs, Surveys

Scientific paper

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 (FHB) 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.
Based on observations obtained at the Pico dos Dias Observatory, operated by the National Laboratory for Astrophysics, Brazil.

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