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Constraints on thick disc and halo parameters from HST photometry of field stars in the Galaxy

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Constraints on thick disc and halo parameters from HST photometry of field stars in the Galaxy

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Título Constraints on thick disc and halo parameters from HST photometry of field stars in the Galaxy
Autor Kerber, Leandro de Oliveira
Javiel, Sandro Caldeira
Santiago, Basilio Xavier
Abstract We analyse a sample of over 1000 stars from 32 fields imaged in the V and I bands with the Wide Field and Planetary Camera, on board of the Hubble Space Telescope. The fields are located at Galactic latitudes |b| ≥ 15º and in various directions on the sky. We consider models for the structure of the Galaxy with di erent choices for the main parameters governing the shape and luminosity function of the thick disk and stellar halo. Comparing model predictions with the observed colour-magnitude diagram we are able to rule out an increasing or flat stellar luminosity function at the low-luminosity end. We also rule out large values of the vertical scale height of the thick disc, z0, nding it to be in the range 800 ≤ z0 ≤ 1200 pc. As for the local density normalization, values within the range 4% ≤ n0 ≤ 8% seem to better reproduce the data. Our data essentially rule out a flattened stellar halo (c/α <~ 0.5) or models with both large local normalization and e ective radii.
Contido em Astronomy and astrophysics. Berlin. Vol. 365, no. 3 (Jan. 2001), p. 424-430
Assunto Fotometria astronômica
Galaxia
[en] Galaxy: structure
[en] Stars: statistics
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98508
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