SMC H-Alpha Emission Stars and Nebulae Catalog from 1997 CTIO Survey

1898 H-alpha emission-line stars and small nebulae in the Small Magellanic Cloud were discovered in an objective-prism survey using the 0.90m Curtis Schmidt telescope at Cerro Tololo Inter-American Observatory. The catalog, created by NASA HEASARC in November 1997, includes newly identified planetary nebulae, compact H II regions, and late-type stars. It provides continuum intensities, H-alpha emission line shapes and strengths, coordinates, and cross-identifications for the listed objects.

Use Cases

• Identify and classify planetary nebulae and compact H II regions based on provided H-alpha emission line characteristics.
• Study the distribution and properties of emission-line stars in the Small Magellanic Cloud using the coordinate data.
• Cross-reference newly discovered objects with other astronomical catalogs using the provided identifications.

Strengths

• Contains 1898 emission-line objects, almost quadrupling previous discoveries in the region.
• Includes specific measurements such as continuum intensities and H-alpha emission line shapes and strengths.
• Originates from a defined survey using the 0.90m Curtis Schmidt telescope at CTIO.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last updated 2026-03-13 18:30:31.918243; freshness should be verified.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

NASA HEASARC, based on the ADC/CDS catalog J/A+AS/102/451 by Meyssonnier and Azzopardi.

Collection Method

Objective-prism survey performed through an H-alpha + [N II] interference filter.

Time Range

Survey date not specified; catalog version created in November 1997.

Freshness

Catalog version created in November 1997; last metadata update recorded as 2026-03-13.

Geography

Small Magellanic Cloud (SMC).