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 periodLong-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-

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

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

4.8 4.9 5 5.1 5.2 5.3 5.4 5.5

x 104

9

10

11

12

13

14

15

JD-2400000

mag

MACHO r+17

OGLE II I-1

OGLE III I

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

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)

Thanks !