Kinematics of Nearby Subdwarfs And the Luminosity Function of the Galactic Thick Disk

We present an analysis of the space motions of 740 subdwarf stars based on the sample stars of Carney et al. (1994; CLLA). Hipparcos parallaxes and proper motion and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. The kinematical behavior is discussed in particular in relation to their metallicities. For stars with metallicity -1.0<[Fe/H]<-0.4, the velocity distribution represent the thick disk population. We derived the luminosity function of thick disk using 1/V_{max} method. We found that the luminosity function in absolute magnitude of M_V=4-5 mag, agree well with the Luminosity function derived from the stellar initial function (Reyle & Robin 2001). We analayzed the kinematics in our thick disk sample and found substructure in the thick disk population.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Heidelberg

Year

2005

Author dc:creator

• Arifyanto, Mochamad Ikbal

Contributors dc:contributor

• Fuchs, Burkhard

Repository record source_url

http://www.ub.uni-heidelberg.de/archiv/6004

OAI identifier oai:identifier

oai:archiv.ub.uni-heidelberg.de:6004