# Q80030840

> planetary nebula

**Wikidata**: [Q80030840](https://www.wikidata.org/wiki/Q80030840)  
**Source**: https://4ort.xyz/entity/q80030840


## References

1. SIMBAD
2. Classification of emission line spectra of planetary nebulae
3. Wolf-Rayet nuclei of planetary nebulae. Observations and classification
4. Quantitative classification of WR nuclei of planetary nebulae
5. Low-resolution spectroscopy of hot post-AGB candidates II. LS, LSS, LSE stars and additional IRAS sources
6. A reclassification of WC and "O VI" central stars of planetary nebulae, and comparison with population I WC stars
7. Catalog of Galactic OB Stars
8. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
9. Fourth USNO CCD Astrograph Catalog
10. Gaia Data Release 2
11. A radial velocity survey for post-common-envelope Wolf–Rayet central stars of planetary nebulae: first results and discovery of the close binary nucleus of NGC 5189
12. The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale