ChESS: 348 X-Ray-Emitting Stars from Chandra and SDSS Correlation

The ChaMP Extended Stellar Survey (ChESS) X-Ray Catalog contains 348 X-ray-emitting stars identified by NASA HEASARC. The catalog was created by correlating archival X-ray images from the Chandra Multiwavelength Project with optical data from the Sloan Digital Sky Survey, using morphological and photometric cuts to isolate stellar sources. This table was created by the HEASARC in January 2009 based on data from a published reference paper.

Use Cases

• Analyzing the relationship between X-ray and H-alpha luminosity (L_X/L_bol vs. L_H-alpha/L_bol) based on derived quantities mentioned in the description.
• Studying the distribution of stellar X-ray emitters in the L_X-distance plane to fill the gap between nearby and distant surveys.
• Investigating stellar population characteristics, such as the fraction of giants (~10%) and the split between young and old disk populations, based on photometric metallicity estimates.
• Identifying and classifying rare stellar types, such as cataclysmic variables and variable giants, from the cataloged sources.

Strengths

• Catalog contains 348 identified X-ray-emitting stars with derived distances from ~10 to 2000 pc.
• Selection process retained 92% of spectroscopically confirmed stars while excluding 99.6% of extragalactic sources from the original 2121 matched sources.
• Includes new spectral classifications and H-alpha measurements for 79 stars, supplementing 42 previously classified sources.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-03-13 18:57:19.707418; freshness should be verified.

Provenance

Source

NASA HEASARC, based on data from the Astrophysical Journal (ApJ).

Collection Method

Correlation of archival X-ray images from the Extended Chandra Multiwavelength Project (ChaMP) with optical data from the Sloan Digital Sky Survey (SDSS), using star/galaxy separation and photometric cuts.

Time Range

Based on archival data; specific observation dates are not provided.

Freshness

Last updated 2026-03-13 18:57:19.707418

Geography

Sky coverage from the ChaMP and SDSS surveys; specific regions are not detailed.