OB Stars in the Solar Neighborhood I: Analysis of their Spatial Distribution

Abstract

We present a newly-developed, three-dimensional spatial classification method, designed to analyze the spatial distribution of early type stars within the 1 kpc sphere around the Sun. We propose a distribution model formed by two intersecting disks -the Gould Belt (GB) and the Local Galactic Disk (LGD)- defined by their fundamental geometric parameters. Then, using a sample of about 550 stars of spectral types earlier than B6 and luminosity classes between III and V, with precise photometric distances of less than 1 kpc, we estimate for some spectral groups the parameters of our model, as well as single membership probabilities of GB and LGD stars, thus drawing a picture of the spatial distribution of young stars in the vicinity of the Sun.

arXiv comment28 pages including 9 Postscript figures, one of them in color. Accepted for publication in The Astronomical Journal, 30 January 2006

References in corpus (3)

• A Hipparcos census of the nearby OB associations
• The spatial distribution of O-B5 stars in the solar neighborhood as measured by Hipparcos
• The velocity field of young stars in the solar neighbourhood

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