# HD221531

> peculiar star in the constellation Aquarius

**Wikidata**: [Q12067707](https://www.wikidata.org/wiki/Q12067707)  
**Source**: https://4ort.xyz/entity/q12067707


## References

1. VizieR
2. First direct evidence that barium dwarfs have white dwarf companions
3. SIMBAD
4. Gaia Data Release 2
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. The nature of the F str lambda 4077 stars. III. Spectroscopy of the barium dwarfs and other CP stars