Optical aperture synthetic images of the photosphere and molecular atmosphere of Mira

Details Optical aperture synthetic images of the photosphere and molecular atmosphere of Mira Optical aperture synthetic images of the photosphere and molecular atmosphere of Mira

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1662h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, no. 5, May 1992, p. 1662-1667, 1719. Research supported by Packard Foundation.

Astronomy and Astrophysics

Astronomy

49

Mira Variables, Photosphere, Stellar Atmospheres, Synthetic Apertures, Stellar Oscillations, Stellar Spectrophotometry

Scientific paper

Aperture-synthetic imaging methods are used to obtain diffraction-limited images of the photosphere and molecular atmosphere of the long period variable star Mira (Omicron Ceti). These maps, obtained close to the peak of Mira's variability cycle, clearly indicate substantial distortions from circular symmetry. The image of the emission due to resonant scattering of TiO shows a significant contribution due to a cool atmosphere with a radius one and a half times as great as that of the photosphere. It is suggested that the photospheric asymmetry is most likely associated with the intrinsic pulsation mode of the star, and stable nonradial pulsation modes can coexist with the radial modes that are responsible for the photometric variability. Further aperture synthetic mapping, which should be possible for a major fraction of the photometric cycle, is capable of verifying this hypothesis.

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