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
Thanks !
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