Luminosity functions of disk and halo populations in SA 51, SA 57, and SA 68

Astronomy and Astrophysics – Astronomy

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Astrometry, Main Sequence Stars, Star Distribution, Stellar Luminosity, White Dwarf Stars, Density Distribution, Error Analysis, Galactic Structure, Hertzsprung-Russell Diagram, Stellar Spectrophotometry, Subdwarf Stars

Scientific paper

An investigation of the luminosity functions of Population I main-sequence stars, Population I white dwarfs, and Population II subdwarfs in SA 51, SA 57, and SA 68 is made using the V'/V'(m) method. The luminosity function of Population I main-sequence stars in the sample depends on the scale height z(0) adopted. The permissible range of z(0), using the V'/V'(m) test, is 300-500 pc. From kinematic considerations, it is argued that the appropriate z(0) for the present sample is 500 pc. The space density of Population I white dwarfs is estimated to be 0.02/cu pc. The scale height for Population I white dwarfs is 400-500 pc. The local mass density of Population II objects is estimated to be 0.0003 solar mass/cu pc.

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