# EM* AS 220
**Wikidata**: [Q75815732](https://www.wikidata.org/wiki/Q75815732)  
**Source**: https://4ort.xyz/entity/em-as-220


## References

1. SIMBAD
2. Optical spectroscopy of close companions to nearby Herbig Ae/Be and T Tauri stars
3. Washington Double Star Catalog
4. Fourth USNO CCD Astrograph Catalog
5. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
6. Accretion-related properties of Herbig Ae/Be stars. Comparison with T Tauris
7. Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
8. Evolution of emission-line activity in intermediate-mass young stars
9. A spectroscopic survey of Herbig Ae/Be stars with X-shooter – I. Stellar parameters and accretion rates