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In page Lucienne Divan:

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With Barbier and Chalonge, Lucienne Divan contributed to the development of the three-dimensional stellar spectroscopic classification system called Classification of the IAP or BCD (for Barbier-Chalonge-Divan). This system was based on the spectro-photometric properties of the Balmer discontinuity in stellar spectra from a series of articles published in the Annals of Astrophysics entitled "Researches on stellar continuous spectra." The BCD classification system for stars is not utilized today, scientists prefer the MK spectral classification system.[citation needed] Divan also published on the spectral properties of particular stars like Be stars, and particular variable stars like V533 Hercules and FG Sagittae.[1]