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A survey of early-type stars based on the Two Micron All Sky Survey database

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A survey of early-type stars based on the Two Micron All Sky Survey database

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Título A survey of early-type stars based on the Two Micron All Sky Survey database
Autor Ortiz, Roberto Pereira
Malacarne, Marcio
Wilhelm, Ronald
Costa, R. D. D.
Rossi, Silvia
Maciel, Walter Junqueira
Abstract 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 lowgravity stars (post-AGB) have been identified in the sample.
Contido em The astronomical journal. Chicago. Vol. 134, no. 3 (Set. 2007), p. 1183-1194
Assunto Astronomia infravermelha
Espectros estelares
Galaxia
[en] Galaxy: halo
[en] Galaxy: stellar content
[en] Stars: early-type
[en] Stars: horizontal-branch
[en] Subdwarfs
[en] Surveys
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108240
Arquivos Descrição Formato
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