Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..366s&link_type=abstract
NOAO Proposal ID #2008B-0366
Astronomy and Astrophysics
Astronomy
Scientific paper
Mira variable stars with periods shorter than 300 days (SP-Miras) are good tracers for determination of dynamical properties of the Galactic disk from the points of the identification, age, and distance- estimate. Recent accurate astrometric data elucidated the existence of some moving groups of stars on orbits deviated from the circular orbits in the solar neighborhood. In order to examine their formation scenario, it is vital to set strong limits on the resonances of the potential of the bar and spiral arms from the full space motions of the stars because the distribution of the orbits is sensitive to the positions of the resonances. We produced a sample of 370 Galactic SP- Miras that are mainly located at the Galactocentric distance of 5-12 kpc. This sample includes 111 SP-Miras with no radial velocities. In this semester, we propose to measure the radial velocities of 38 SP- Miras with no radial velocities at the Galactocentric distance of 5-7 kpc and to limit on the positions of the resonances from their systematic motion.
Hasegawa Takashi
Sakamoto Tsuyoshi
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