1. Database of Variable Stars Bingqiu Chen & Biwei Jiang Beijing Normal University

2. Outline Data Source –MACHO & OGLE Database –LINUX+Apach+MySQL+PHP Interface –HTML+PHP search interface

3. Data Source Long period  Long-term observation projects  Microgravitational Lensing projects MACHO –Since1992 –B & R filters OGLE –OGLE-I: 1992 -1995 –OGLE-II: 1997-2001 –OGLE-III: 2001-2009 –OGLE-IV ： 2009.9-

4. Data MACHO –21747 stars （ RRLYR ， ACEP… ） OGLE – OGLE-II: Buldge: 200 000 MCs: 68 000 –OGLE-III : LMC Long Period Variables: 91 995 RR Lyrae Stars:24 906 Type II Cepheids & Anomalous Cepheids :197 + 83 Classical Cepheids : 3361

5. A example One star was observed in both the two projects 05:02:09.25 -69:23:30.4 OGLE-LMC-LPV-12798 LMC_SC15_174030 1.3562.17

6. Model Entity Relationship between entities Attribute ID Standardization

7. Database of Variable Stars Data –Images （ ps ， fits ） –Reducted phot files Catalog –Entities ： Types Locations Mean magnitude Period etc.

8. Database Data files  Standard entities  Most important entities (cell source ) ( catalog ) Data accessed & operated Application online etc. LAMP

9. Platform ： –LINUX( FEDORA12) Software for database ： –MySQL Application, Interface, Data download & upload ： –PHP （ include JpGraph library ） –Apach –PhpMyAdmin

10. Web interface Web search interface ： Go to

11. One example An example in database(05:05:12 -69:24:40)An example

12. Thanks !