# HD 21856

> star in the constellation Perseus

**Wikidata**: [Q10849560](https://www.wikidata.org/wiki/Q10849560)  
**Source**: https://4ort.xyz/entity/q10849560


## References

1. New Catalogue of Suspected Variable Stars
2. [VizieR](https://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ6274260a17f32b&-out.add=.&-source=VI/42/out&-c=051.1774%20%2b35.0348,eq=B1875,rs=2)
3. The kinematics of the Gould belt: an expanding group ?
4. Photoelectric measures of the 4430 A diffuse interstellar band
5. Seven-colour photometry of O, B and A stars
6. On the precision of the determination of spectral classes and colour excesses of O-A2 stars by the methods of two color diagrams
7. A two-dimensionnal quantitative spectral classification of 283 O5-B7 stars and the construction of a spectrum-absolute magnitude diagram
8. The equivalent widths of absorption lines in the spectra of 109 O5-B7stars
9. Two-dimensional spectral classification by narrow-band photometry for B stars in clusters and associations
10. Some observations of the Si lines in B-type stars
11. Photometric, polarization, and spectroscopic observations of O and B stars
12. On the H and K emission in dwarf stars
13. Photometry of the Perseus aggregates
14. Studies in galactic structure. II. Luminosity classification for 1270 blue giants stars
15. Studies in galactic structure. I. A preliminary determination of the space distribution of the blue giants
16. SIMBAD
17. Catalog of Galactic OB Stars
18. The Tycho-2 catalogue of the 2.5 million brightest stars
19. Gaia Data Release 2
20. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
21. A stellar rotation census of B stars: from ZAMS to TAMS