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Circumstellar dust around FU Orionis stars

Published online by Cambridge University Press:  04 August 2017

Gunnar Welin
Gunnar Welin*
Affiliation:
Astronomical Observatory, Box 515, S-751 20 Uppsala, Sweden

Extract

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It is immediately apparent from IRAS and other far infrared data (figure 1) that all known FU Orionis stars, or fuors, are associated with substantial amounts of cool circumstellar dust.

The pre-outburst magnitudes for V1057 Cyg indicate that this star was immersed in circumstellar dust already before its flare-up in 1969–1970, and hence that this dust did not - as has been claimed - appear only after the outburst; regrettably there exist no far infrared data from that time. The colours also exclude the possibility that the star then was of the alleged spectral type KO, but point to it being of a rather early type and obscured by both interstellar, local, and circumstellar matter. For details, see Welin 1985.

Type
Bipolar Flows, Jets and Protostars
Information
Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 67 - 68
Copyright
Copyright © Reidel 1987 

References

Cohen, M. and Kuhi, L.V. 1979, Astrophys. Journal Suppl. 41, 743 CrossRefGoogle Scholar
Haro, G. 1972, Inf. Bull. Variable Stars No. 714 Google Scholar
Welin, G. 1985, Astrofizika 23, 437 Google Scholar