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Residual extinction effects in spectra of newly formed stars

Published online by Cambridge University Press:  23 September 2016

Jacek Krelowski ,
Jacek Papaj  and
Walter Wegner
Jacek Krelowski
Affiliation:
1 Institute of Astronomy, N. Copernicus University ul. Chopina 12/18, Pl-87-100 Torun, Poland
Jacek Papaj
Affiliation:
1 Institute of Astronomy, N. Copernicus University ul. Chopina 12/18, Pl-87-100 Torun, Poland
Walter Wegner
Affiliation:
2 Institute of Mathematics, Pedagogical University, ul. Chodkiewicza 30, Pl-85-064 Bydgoszcz, Poland

Abstract

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Extinction laws observed in spectra of Be stars are shown to be evidently different from the mean extinction curve. They do not contain in many cases the prominent extinction feature - the 2200A bump. The results are derived both from multicolour (ranging from the far-IR until the ultraviolet ANS) photometry and from TD-1 UV spectra. It is strongly suggested that the observed extinction phenomena are originated in circumstellar, disk-shaped shells as the shape of resultant extinction curve suggests both the presence of big, core-mantle grains and continuous infrared emission of circumstellar origin.

Type
III Flare Stars and Related Objects Fuors and Other Non-Stable Objects
Information
Symposium - International Astronomical Union , Volume 137: Flare Stars in Star Clusters, Association and Solar Vicinity , 1990 , pp. 293 - 297
Copyright
Copyright © Kluwer 1990 

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