Other
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esoc...33..471c&link_type=abstract
ESO Workshop on Low Mass Star Formation and Pre-Main Sequence Objects, p. 471 - 489
Other
57
Herbig Ae-Be Stars: Stellar Evolution, Herbig Ae-Be Stars: Hr Diagrams, Herbig Ae-Be Stars: Circumstellar Dust, Herbig Ae-Be Stars: Line Profiles, Herbig Ae-Be Stars: Stellar Activity
Scientific paper
Herbig proposed a list of 26 candidates verifying four criteria, which are now commonly used as definition for the Herbig Ae/Be stars: (1) The spectral type is earlier than F0: this criterion allows to select only massive objects. (2) They exhibit emission lines in their spectra: the presence of emission lines was known to be a characteristic of T Tauri stars, and therefore was considered as a criterion of youth. (3) They lie in an obscured region: another criterion of youth, young stars have not had enough time to escape from their parental clouds. (4) They illuminate a bright reflection nebula in their immediate vicinity: this criterion eliminates those stars that would simply be projected on dark clouds on the celestial sphere.
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