A Proposal for Kinematical and Dynamical Survey of Galactic Disk with LAMOST

1. A Proposal for Kinematical and Dynamical Survey of Galactic Disk with LAMOST October 2005

2. General Status • Proper motions • Hipparcos(1997): 117955 stars with parallexes • Tycho 2(2000): 2.5 million stars, completeness to V=11 mag • UCAC 2(2004): 48.3 million stars • Radial velocities • GCRV(2000) : 36145 stars • CORAVEL: 45000 stars, among them 14000 F-G dwarfs and 6700 K-M giants were released (2004) • What can we do before GAIA and RAVE?

3. Schematic structure via GSC2.3 stellar counters

4. Kinematical structure in different survey deep

5. Kinematical and dynamical structure for Galactic thin disk with LAMOST Structure of young disk populations: Neutral hydrogen, O-B stars, supergiants, bright giants, classical cepheids, young open clusters Early formation and evolution of the Galaxy Structure of O-B stars: connection of Galactic hydrogen and Galactic stars (disk population I and II)

6. Structure of the H I layer

7. The warped Galaxy Distribution of O-B stars on the Galactic plane

8. The warped Galaxy Distributions of O-B stars projected on the x-z and y-z planes

9. The warped Galaxy Distributions of O-B stars interior to the solar circle (left) and exterior to the solar circle (right)

10. The warping motion of O-B stars The kinematical structure of the optical Galactic warp derived from the Hipparcos proper motions.

11. Gould belt stars • Characteristics • With an inclination of about 20˚ to the galactic plane and a line of nodes running roughly parallel to the direction of galactic rotation. • Extends on the galactic plane from about 300 pc in the centre direction to about 600 pc towards the anticentre direction. • Kinematics differs remarkably from pure circular differential rotation. A significant -term indicates an expansion of the system. • The characteristic behaviour is confined to stars younger than about 30-40 Myr.

12. Distributions and velocity space of Gould belt stars On x-y plane

13. Distributions and velocity space of Gould belt stars On the x-z plane

14. Distributions and velocity space of Gould belt stars On the y-z plane

15. Distributions and velocity space of Gould belt stars Spatial distribution of stars in the solar vicinity younger than 30 Myr. The tilted rectangular box indicates the region within which the inclination to the galactic plane characterizing the Gould belt system. The ellipse indicates the expanding ring of neutral hydrogen. Some neighbouring associations are indicated by small circles.

16. Distributions and velocity space of Gould belt stars Distribution on the x-z plane for stars with known PMs (left) and for stars with PMs & RV (right). At the top, the stars with an age less than 30 Myr, in the middle; those with an age between 30 Myr and 60 Myr; and at the bottom, those with an age larger than 60 Myr.

17. Kinematical effects of the Gould belt Variation of Oort constants plotted against the age for stars in the range 100 pc < r  600 pc. The units are in km s-1 kpc-1.

18. Residual heliocentric space velocity vectors projected on the galactic plane for stars with an age less than 30 Myr (top left), between 30 to 60 Myr (top right), between 60 to 90 Myr (bottom left), and between 90 to 120 Myr (bottom right).

19. The Ori OB1 association and the high moving away association Sco-Cen. The corresponding heliocentric space velocity vectors (a, c) and residual velocity vectors (b, d) are projected on the x-y plane and x-z plane, respectively.

20. Residual velocity space for stars younger than 60 Myr within r  150 pc (left) and 150 pc < r  300 pc. The centre of Olano’s Lindblad Ring is placed at r = 166 pc from the Sun in the direction l = 131˚ (with a cross), and semiaxes of 364 pc and 211 pc. The centre of the Gould belt is located at r = 80 pc, l = 146˚ (with a square).

21. Kinematics of galactic cepheids

22. Large scale kinematics——rotation curve Galactic cepheids (red circle) and O-B stars (black dot) Young open clusters

23. Large scale kinematics——rotation curve