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Title:
Asymmetries in the atmosphere of Mira
Authors:
Karovska, M.; Nisenson, P.; Papaliolios, C.; Boyle, R. P.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AD(Vatican Observatory, Vatican City State)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 374, June 20, 1991, p. L51-L54. Smithsonian Institution-supported research. (ApJL Homepage)
Publication Date:
06/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
MIRA VARIABLES, STELLAR ATMOSPHERES, STELLAR OSCILLATIONS, HERTZSPRUNG-RUSSELL DIAGRAM, INTERFEROMETRY
DOI:
10.1086/186069
Bibliographic Code:
1991ApJ...374L..51K

Abstract

A two-dimensional high angular resolution study of Omicron Ceti (Mira), carried out at four epochs from November 1983 to November 1988 using speckle interferometry techniques, detected asymmetries in the extended atmosphere of this pulsating star. The reconstructed speckle images show that the strength and the shape of this asymmetry changes as a function of wavelength and time. The position angles of the major axes of the asymmetries at different epochs are determined and the axes were measured accurately as a function of wavelength. The origin of the observed asymmetries has not yet been identified. Plausible causes include instabilities in the pulsating atmosphere, nonspherical pulsation, or the interaction with the nearby companion.

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