Cygnus OB2 Association: Chandra X-Ray Catalog of 1003 Stellar Sources

1003 X-ray sources were detected in a 97.7ks Chandra observation of the young Cygnus OB2 star-forming region. The catalog, created by NASA HEASARC in 2008, correlates sources with optical and near-IR data to study the low-mass stellar population. X-ray luminosities range from 10^30 to 6.3 x 10^33 erg s^-1, with spectral and variability analysis for members.

Use Cases

• Classifying stellar populations based on X-ray and near-IR properties mentioned in the description.
• Analyzing X-ray variability and flare characteristics based on the reported 13% variability rate and flare statistics.
• Modeling stellar absorption and plasma temperatures using the reported typical log N_H and kT values.
• Studying the correlation between stellar mass and X-ray luminosity across the reported luminosity ranges for different star types.

Strengths

• Contains 1003 X-ray sources with 775 having correlated near-IR counterparts.
• Provides detailed X-ray spectral parameters (e.g., log N_H ~ 22.25, kT ~ 1.35 keV) and luminosity ranges for different stellar types.
• Includes analysis of X-ray variability, with flares accounting for at least 60% of variable sources.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The description notes that 10 of the 1003 sources are likely spurious statistical fluctuations.

Provenance

Source

National Aeronautics and Space Administration, NASA HEASARC

Collection Method

Analysis of a Chandra ACIS-I observation using PWDETECT for source detection and ACIS EXTRACT for event extraction, correlated with optical/near-IR catalogs.

Time Range

Observation date 2004 January 16.

Freshness

Last updated 2026-03-13 17:38:11.086915; freshness should be verified.

Geography

Pointed at the core of the Cygnus OB2 region (J2000.0 RA,Dec = (20 33 12.2, +41 15 00.7)).