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History of the Light Curves and Molecular Maser Emission of the Miras U Ori and R Leo

Published online by Cambridge University Press:  07 August 2017

I. L. Andronov ,
L. S. Kudashkina  and
G. M. Rudnitskij
I. L. Andronov
Affiliation:
Odessa Astronomical Observatory Shevchenko Park Odessa, 270014 Ukraine
L. S. Kudashkina
Affiliation:
Odessa Astronomical Observatory Shevchenko Park Odessa, 270014 Ukraine
G. M. Rudnitskij
Affiliation:
Sternberg Astronomical Institute Moscow State University Moscow V-234, 119899 Russia

Extract

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We have collected all the available data on light curves, OH, H2O and SiO maser observations for a sample of Mira-type variables. We consider in detail the data on two stars, U Ori and R Leo. There is a net correlation between optical and radio line variations for all the three molecular species in these stars. More pronounced maser flares seem to follow brighter-than-average visual maxima of the stars. We discuss also the drastic changes in the type of the OH maser radio emission which happened in these stars some years ago. Implications for the mechanisms of maser pumping and the evolutionary status of these stars (probably undergoing the helium flash) are discussed.

Type
IV. Planetary Nebulae Connection: Evolution from the AGB
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 323
Copyright
Copyright © Kluwer 1993