Stellar Observations Network Group (SONG)

1. Chinese SONG team Speaker: Jianning Fu (Beijing Normal University) 2010.10.16 Stellar Observations Network Group (SONG)

2. To install 8 1-m telescopes at 8 sites around the equator, to compose the SONG network. • To make High-precision continuous radial-velocity observations for individual stars, to study the internal structures of the target stars in detail with asteroseismological technique. • To make high time-resolution high-precision photometric observations for the stars in the bulge of the Galaxy, to search for earth-like exoplanets. • Initialized by Danish astronomers. SONG project

3. Distribution of the SONG telescopes

4. Dome of SONG telescope

5. 1-meter telescope Spectrograph

8. Primary object of SONG: 1. Asteroseismology:Long-duration high-duty-cycle high-precision radial velocity curves

9. 2. Searching for exoplanets with the microlensing effect: High duty-cycle moderate duration high-precision photometry for crowded star regions

12. Chinese SONG plan:1. By setting up a SONG node in China, to make international collaboration and competition in the front edge field of stellar physics.2. To build up Mini-SONG, the first Chinese global observation network located at the best sites of the world.

13. Started in May of 2009; • Agreement of collaboration between China and Denmark signed in September of 2009; • Agreement of collaboration among Denmark, China, and the USA for the network of northern hemisphere signed in December of 2009; • The third SONG workshop held in Beijing in March of 2010; • Mini-SONG project proposed2 in March of 2010. Schedule of chinese SONG plan

14. Site investigation started in January of 2010: Site test in Delingha; Data being collected for the other candidate sites; Composition of teams and schedule decided in January of 2010. Progress

15. Weather record in Delingha Monthly distribution of the observable nights in Delingha

17. A customized node of SONG:A 1-meter universal telescope for high-precision photometry; To make time-series observations for variable objects and lucky-imaging; A candidate site: the South-American station of NAOC

18. Budget： Design：3 M Telescopes: 27 M Site: 5 M Data: 3M Mini-SONG: 10 M Others: 2 M In total：50 M

19. Institutions: • National Astronomical Observatories of China • Yunnan Astronomical Observatory • Beijing Normal University Chinese SONG TEAM

20. Thanks for your attention！