New light on faint stars. IV - Proper motion surveys and the luminosity function

Details New light on faint stars. IV - Proper motion surveys and the luminosity function New light on faint stars. IV - Proper motion surveys and the luminosity function

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206....1r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Jan. 1, 1984, p. 1-17.

Astronomy and Astrophysics

Astronomy

24

Halos, Main Sequence Stars, Stellar Luminosity, Stellar Motions, Subdwarf Stars, Calibrating, Globular Clusters, Kinematic Equations, Stellar Spectrophotometry

Scientific paper

The application of photometric and kinematic absolute magnitude calibration methods to the disk main sequence luminosity function yields significantly different estimates of the number density of very faint dwarf stars. Numerical techniques are presently used to investigate the biases affecting the latter method, using observational data (which show that distant high velocity subdwarfs make a substantial contribution to deep proper motion surveys) as a constraint on simulations. An analysis of these surveys offers an effective method for the determination of the halo luminosity function, and the results obtained suggest that this function may be flatter than that of the disk. The inclusion of these halo stars accounts for the higher space densities of low luminosity dwarf stars derived by Luyten (1925), by comparison with kinematically unbiased photometric surveys.

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