Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120..314r&link_type=abstract
The Astronomical Journal, Volume 120, Issue 1, pp. 314-318.
Astronomy and Astrophysics
Astronomy
38
Galaxy: Stellar Content, Stars: Early-Type
Scientific paper
Galactic latitudes and photographic magnitudes for large samples (N~2000-4000) of OB stars within 10deg of the Galactic plane and 4 kpc of the Sun are used to estimate the exponential scale height and surface density of these objects assuming a barometric extinction model. Depending upon the scale height and differential extinction of the absorbing layer, estimates of the OB-star scale height hOB vary from ~25 to 65 pc and of the surface density OB from ~6 to 80 stars per 105 pc2. Reasons for the wide spread in this latter figure are discussed. For an absorbing layer of scale height σ=100 pc and B-band extinction of 2 mag kpc-1, we find hOB~45 pc and OB~26 stars per 105 pc2. The total Galactic population of these stars is estimated at ~60,000, and their formation rate at one every 40 years. Estimates of the scale height are found to be essentially independent of the assumed mean absolute magnitude for OB stars.
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