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Title:
The light curve and changes in the circumstellar envelope around IRC + 10216
Authors:
Dyck, H. M.; Benson, J. A.; Howell, R. R.; Joyce, R. R.; Leinert, Ch.
Affiliation:
AA(Wyoming, University, Laramie), AB(Wyoming, University, Laramie), AC(Wyoming, University, Laramie), AD(National Optical Astronomy Observatories, Tucson, AZ), AE(Max-Planck-Institut fuer Astronomie, Heidelberg, Federal Republic of Germany)
Publication:
Astronomical Journal (ISSN 0004-6256), vol. 102, July 1991, p. 200-207. (AJ Homepage)
Publication Date:
07/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CARBON STARS, INFRARED PHOTOMETRY, LIGHT CURVE, STELLAR ENVELOPES, INFRARED INTERFEROMETERS, SPECKLE INTERFEROMETRY, STELLAR MODELS
DOI:
10.1086/115866
Bibliographic Code:
1991AJ....102..200D

Abstract

This paper presents results of NIR photometric observations of IRC + 10216 star during the time interval 1965-1990, which were combined with measurements of the circumstellar shell surrounding IRC + 10216 by IR speckle interferometry. Using these data together with published observations, a very precise light curve was constructed, demonstrating the occurrence of long-term changes in the circumstellar shell surrounding IRC + 10216. The observations are discussed in the framework of two alternatives: (1) the occurrence of dynamical changes in the shell and (2) blocking of the direct light from the star to a portion of the shell by intervening material.

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