The density distribution of the Galactic stellar halo as traced by blue horizontal branch stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Horizontal Branch, Galaxy: Halo, Galaxy: Structure

Scientific paper

Data of blue horizontal branch (BHB) stars and RRLyrae variable stars from the literature are combined with unpublished observations of BHB stars in five fields. A flattened power law is used to model the spatial distribution of the horizontal branch stars. Completeness of the data sample and contamination by blue stragglers and metal-rich main-sequence A stars are considered, and taken into account. Using a maximum-likelihood method, the following best-fitting parameters are obtained: a power-law index alpha=-3.2+/-0.3 and an axial ratio of q=0.52+/-0.11 for the isodensity surfaces. From the fit a value for the local density of BHB stars of rho_0=26^+20_-11 kpc^-3 is found. The values of the three parameters are in complete agreement with recent determinations by other authors.

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