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

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

Data Source Long period  Long-term observation projects  Microgravitational Lensing projects MACHO –Since1992 –B & R filters OGLE –OGLE-I: –OGLE-II: –OGLE-III: –OGLE-IV ：

Data MACHO –21747 stars （ RRLYR ， ACEP… ） OGLE – OGLE-II: Buldge: MCs: –OGLE-III : LMC Long Period Variables: RR Lyrae Stars: Type II Cepheids & Anomalous Cepheids : Classical Cepheids : 3361

A example One star was observed in both the two projects 05:02: :23:30.4 OGLE-LMC-LPV LMC_SC15_

Model Entity Relationship between entities Attribute ID Standardization

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

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

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

Web interface Web search interface ： Go to

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

Thanks !