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Long-term cyclicity of the Herbig Ae star BF Ori: Giant protocomets and accretion from a protoplanetary disk

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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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Authors and Affiliations

  1. Astronomical Institute, Academy of Sciences of Uzbekistan, Astronomicheskaya ul. 33, Tashkent, 700052, Uzbekistan

    V. S. Shevchenko† & O. V. Ezhkova

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  1. V. S. Shevchenko†
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  2. O. V. Ezhkova
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__________

Translated from Pis’a v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 27, No. 1, 2001, pp. 47–60.

Original Russian Text Copyright © 2001 by Shevchenko, Ezhkova.

† Deceased.

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Shevchenko†, V.S., Ezhkova, O.V. Long-term cyclicity of the Herbig Ae star BF Ori: Giant protocomets and accretion from a protoplanetary disk. Astron. Lett. 27, 39–50 (2001). https://doi.org/10.1134/1.1336861

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  • DOI: https://doi.org/10.1134/1.1336861

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