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Title:
Long-Term Cyclicity of the Herbig Ae Star BF Ori: Giant Protocomets and Accretion from a Protoplanetary Disk
Authors:
Shevchenko, V. S.; Ezhkova, O. V.
Publication:
Astronomy Letters, vol. 27, p. 39-50 (2001) (AstL Homepage)
Publication Date:
01/2001
Origin:
AIP; ASTL
Objects:
BF Ori
Keywords:
ACCRETION, VARIABLE AND PECULIAR STARS, PLANETS, COMETS
DOI:
10.1134/1.1336861
Bibliographic Code:
2001AstL...27...39S

Abstract

Having analyzed the light curve for the Herbig Ae star BF Ori, we justify the hypothesis of a giant protocomet, GPC I BF Ori, with a period of 6.3 years and semimajor axis a = 10 +/- 3 AU. Passing through periastron, such a giant protocomet partially breaks up. During each passage through periastron, the protocomet and the fragments that follow it supply dust to circumstellar space for a certain period of time. This hypothesis can account for the entire complex of observable phenomena of cyclic Algol-like activity in Herbig Ae/Be and T Tauri stars. Conditions in a protoplanetary disk after cocoon breakup are discussed. We adduce arguments for the absence of a dust disk and for the weak effect of objects other than comets on cyclic large-scale variability.
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