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The Variability of R, N, and C Stars from HIPPARCOS and AAVSO Data

Published online by Cambridge University Press:  25 May 2016

Michel Grenon ,
Janet A. Mattei ,
Laurent Eyer  and
Grant Foster
Michel Grenon
Affiliation:
Geneva Observatory, Sauverny, Switzerland
Janet A. Mattei
Affiliation:
American Association of Variable Star Observers, Cambridge, MA 02138, U.S.A.
Laurent Eyer
Affiliation:
Geneva Observatory, Sauverny, Switzerland
Grant Foster
Affiliation:
American Association of Variable Star Observers, Cambridge, MA 02138, U.S.A.

Abstract

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Accurate photometry was obtained for all program stars during the 3.3-year HIPPARCOS mission. The final observing program included several hundred Mira (M), long-period semiregular (SR), and irregular (L) variables. A detailed calibration of the aging of the optics allowed the evaluation of very precise magnitudes over the whole range of star colors. Since the time coverage of the satellite observations was not sufficient to describe the behavior of M, SR, or L type variables, smooth curves were fitted statistically to the dense AAVSO observations. These curves were then transformed to the HIPPARCOS system in order to complement the HIPPARCOS photometry and thus produce precise light curves with fuller time coverage, for a set of several hundred late-type variables, including most carbon stars brighter than V = 12.4 at minimum luminosity. A preliminary discussion of the behavior of C stars, as observed from space in the broad Hp band, is given.

Type
Session IV — Variability
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 171 - 178
Copyright
Copyright © Kluwer 2000 

References

European Space Agency (ESA) 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200, Vols. 1 and 12Google Scholar
Eyer, L. & Grenon, M. 1997, in Hipparcos - Venice '97, ESA SP-402, p. 467 Google Scholar
Mattei, J. A. 1988, in Scientific Aspects of the Input Catalogue, Preparation II, ed. Torra, J. and Turon, C., p. 376 Google Scholar