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Direct Observations of the Heterogeneity of Supergiant Disks

Published online by Cambridge University Press:  30 March 2016

J. W. Harvey ,
C. R. Lynds  and
S. P. Worden
J. W. Harvey
Affiliation:
Kitt Peak National Observatory
C. R. Lynds
Affiliation:
Kitt Peak National Observatory
S. P. Worden
Affiliation:
Sacramento Peak Observatory

Extract

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Resolved images of the disks of the largest stars observed with the largest telescopes can be constructed using the class of techniques called speckle imaging. The observations must be made with narrow passbands (~ 10 nm), short exposures (~ 20 ms) compensation for atmospheric dispersion, high magnification and good signal-to-noise ratio. One specific technique applied to a Ori (Lynds et al., 1976) shows slight but apparently real differences in the images of the disk corresponding to low and high opacity in the stellar atmosphere which we interpret as due to temperature differences. There are also significant differences in the star’s diameter and/or limb darkening at the two different opacity wavelengths.

Type
Joint Meeting
Information
Highlights of Astronomy , Volume 4 , Issue 2: Highlights of Astronomy. As presented at the XVIth General Assembly of the IAU, 1976 (Part II) , 1977 , pp. 405
Copyright
Copyright © Reidel 1977

References

Lynds, C. R., Worden, S. P., and Harvey, J. W.: 1976, Astrophys. J. 207, 174.CrossRefGoogle Scholar
McDonnell, M. J., and Bates, R. H. T.: 1976, Astrophys. J. 208, 443.Google Scholar
Nisenson, P., Elm, D. C., and Stachnik, R. V.: 1976, Proc. SPIE 75, 83.Google Scholar