ASAS Photometry of ROSAT X-ray Sources: 2,302 Variable Stars

Photometric data from the All-Sky Automatic Survey (ASAS) - South was used to identify and analyze 6,028 bright stars near X-ray sources from the ROSAT All Sky Survey. The catalog, created by NASA HEASARC in May 2018, identifies 2,302 variable stars with periods from 0.137 to 193 days, including 1,233 newly discovered rotationally variable stars.

Use Cases

• Classifying variable star types based on period and amplitude data mentioned in the description
• Studying the correlation between stellar rotation (spots) and X-ray emission for coronal sources
• Identifying and characterizing eclipsing binary systems from the listed categories
• Analyzing the amplitude distribution of variable stars, including extreme cases like ASAS 063656-0521.0

Strengths

• Contains 2,302 identified variable stars with measured periods
• Includes 1,936 stars classified as rotationally variable, with 1,233 being new discoveries
• Cross-references optical photometry with X-ray sources from the ROSAT Bright Source Catalog

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment
• Data is limited to declination less than 29 degrees (Southern sky)

Provenance

Source

NASA HEASARC, based on CDS Catalog J/AcA/62/67

Collection Method

Photometric data analysis from the All-Sky Automatic Survey (ASAS) - South, cross-matched with ROSAT X-ray sources

Freshness

Last updated 2026-03-13 17:26:13.936342; freshness should be verified

Geography

Southern sky (Declination < 29 degrees)