# HD 137509

> star in the constellation Apus

**Wikidata**: [Q6036947](https://www.wikidata.org/wiki/Q6036947)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/HD_137509)  
**Source**: https://4ort.xyz/entity/hd-137509


## References

1. SIMBAD
2. VizieR
3. Source
4. The Tycho-2 catalogue of the 2.5 million brightest stars
5. Catalogue of Stellar Photometry in Johnson's 11-color system
6. Gaia Data Release 2
7. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
8. Third bibliographic catalogue of stellar radial velocities (Text in French)
9. Interferometry of chemically peculiar stars: theoretical predictions versus modern observing facilities
10. Abundances determined using Si ii and Si iii in B-type stars: evidence for stratification