The long-term evolution of FU Orionis variables

Details The long-term evolution of FU Orionis variables The long-term evolution of FU Orionis variables

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..137h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. 137-145.

Astronomy and Astrophysics

Astrophysics

8

Accretion Disks, Pre-Main Sequence Stars, Stellar Evolution, Variable Stars, Binary Stars, Interstellar Matter, Orion Constellation, Symbiotic Stars

Scientific paper

The evolution of the inner accretion disk in FU Orionis objects (FUO) after the initial photometric eruption is discussed. It is shown that the long-term evolution of the disks could be considerably more complicated than has been assumed, but that the expected behavior and spectral appearance are just those seen in a wide variety of young stellar objects (YSOs). If the viscous parameter alpha depends on temperature, the inner disk will not be able to immediately return to its cold, preoutburst state due to the destruction of all the small dust grains. That a wide variety of YSOs have characteristics which coincide with those of the FUO disks at various times in the eruption cycle suggests a casual connection between the occurrence of FUO eruptions and the production of many different types of objects. It is inferred that some members of the EX subclass of premain-sequence objects are EX-FUOs.

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