Kinematical Search in the Optical for Low-Mass Stars of the Gould Belt System

Details Kinematical Search in the Optical for Low-Mass Stars of the Gould Belt System Kinematical Search in the Optical for Low-Mass Stars of the Gould Belt System

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.1614f&link_type=abstract

Astronomical Journal v.112, p.1614

Astronomy and Astrophysics

Astronomy

7

Stars: Low-Mass, Galaxy: Kinematics And Dynamics

Scientific paper

The peculiar kinematics of the Gould Belt system is modeled as an expansion wave of 3.6 km s-1 velocity, when analyzing the phase space of a set of 9×104 nearby A, F, G disk dwarfs. The shock front distance of 315 pc from the Cas-Tau association leads to a kinematical time scale of 85 Myr, suggesting an expansion induced by the compression of a spiral density wave in the Carina Arm. Post-shock kinetic temperature of the cold neutral phase of the ISM and mass stratification of the gravitational instability favor a possible formation of the Gould Belt system through a Parker-Jeans instability. The instability time scale is on the order of 12 Myr with a characteristic length of 1.4 kpc in the galactic plane and a scale height of 200 pc. The model of the magnetic field instability in the ISM is used to identify stars of spectral types later than A0 whose orbits mimic the gas motion. Formation caused by the impact of a high velocity cloud in the gas of the galactic disk cannot be ruled out in view of the mainly illustrative aspect of the interstellar shock wave suggested picture. A system of 1.2×103 candidates out of the sample of 9×103 stars has been segregated for tracking genuine tracers of the Gould Belt system for follow-up spectroscopic observations. An analysis of the spectra of 55 stars confirms F and G core hydrogen-burning stars whose observed line-of-sight velocity fits the model associated with the Gould Belt system formation at a rms scatter of 7 km s-1. A set of ten candidates with Lithium abundance similar to the Hyades late F-type stars suggests a success rate of 20% for the kinematical search.

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