# Wilson–Bappu effect

> correlation between width of an emission line and absolute visual magnitude of a star

**Wikidata**: [Q1115519](https://www.wikidata.org/wiki/Q1115519)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Wilson–Bappu_effect)  
**Source**: https://4ort.xyz/entity/wilson-bappu-effect


## References

1. Freebase Data Dumps. 2013