Kinematics and Luminosity Function of Dwarf Populations in Three Areas of the Calán-ESO Proper-Motion Catalog

Details Kinematics and Luminosity Function of Dwarf Populations in Three Areas of the Calán-ESO Proper-Motion Catalog Kinematics and Luminosity Function of Dwarf Populations in Three Areas of the Calán-ESO Proper-Motion Catalog

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....126..353r&link_type=abstract

The Astronomical Journal, Volume 126, Issue 1, pp. 353-369.

Astronomy and Astrophysics

Astronomy

6

Stars: Kinematics, Stars: Luminosity Function, Stars: Subdwarfs

Scientific paper

We have completed the analysis of a sample of 112 stars in the solar neighborhood taken from the statistically complete Calán-ESO catalog. From medium-resolution spectroscopy we classified every star, both by direct comparison with spectroscopic standards and by using spectral indices. The latter also allowed discrimination between main-sequence (MS) dwarfs and subdwarfs. Several useful spectral type versus color relations were obtained from CCD photometry of the sample (observed magnitudes were dereddened). Distances and absolute magnitudes were determined. From measured radial velocities and proper motions, we determined the kinematics [Galactocentric velocity components (U,V,W)], which allowed the classification of each star as belonging to the disk or halo population. Luminosity functions (LFs) were then obtained using the 1/Vmax method for the different populations. The maximum in the LF for MS dwarfs was found to be near MV=12.5+/-0.5, in accord with previous determinations. On the other hand, we found an increase in the LF of the subdwarf at its faint end, which is in strong disagreement with determinations by other authors. A mass density of MS dwarfs of ~0.047+/-0.021 Msolar pc-3 was derived, while the contribution of subdwarfs was found to be negligible.
Based on observations obtained with the VLT (ESO), project 67.D-0224A.

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