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An Interferometric Survey of Mira Variables and M Supergiants

Published online by Cambridge University Press:  19 July 2016

P.G. Tuthill ,
C.A. Haniff  and
J.E. Baldwin
P.G. Tuthill
Affiliation:
MRAO, Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHA, UK
C.A. Haniff
Affiliation:
MRAO, Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHA, UK
J.E. Baldwin
Affiliation:
MRAO, Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHA, UK

Abstract

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We present preliminary results from an imaging survey of bright northern Mira variables and Supergiants. Diffraction-limited images of Mira exhibit the same elongation along PA 120° as observed in previous observations. Of the other Mira variables observed, R Cas is unambiguously detected as non-spherically symmetric. Our observations of α-Her are consistent with there being a ‘hot-spot’ on its surface, similar to those we have previously detected on Betelgeuse.

Keywords

Non-redundant-maskingMira variablessupergiant starssurface inhomogeneities.
Type
Imaging Results: Optical and Infrared
Information
Symposium - International Astronomical Union , Volume 158: Very High Angular Resolution Imaging , 1994 , pp. 395 - 397
Copyright
Copyright © Kluwer 1994 

References

[1] Buscher, D.F., Haniff, C.A., Baldwin, J.E., and Warner, P.J.: 1990, ‘Detection of a bright feature on the surface of Betelgeuse’, Mon. Not. R. Astr. Soc. 245, 7p.Google Scholar
[2] Wilson, R.W., Baldwin, J.E., Buscher, D.F., and Warner, P.J.: 1992, ‘High resolution imaging of Betelgeuse and Mira’, Mon. Not. R. Astr. Soc. 257, 369.Google Scholar