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Multiwavelength Studies of Mira Ceti-type Variable Stars

Published online by Cambridge University Press:  25 May 2016

V.F. Esipov ,
M.I. Pashchenko ,
G.M. Rudnitskij ,
M.V. Kozin ,
E.E. Lekht ,
A.E. Nadjip  and
S.V. Fomin
V.F. Esipov
Affiliation:
Sternberg Astronomical Institute, 13 Universitetskij prospekt, Moscow, 119899 Russia
M.I. Pashchenko
Affiliation:
Sternberg Astronomical Institute, 13 Universitetskij prospekt, Moscow, 119899 Russia
G.M. Rudnitskij
Affiliation:
Sternberg Astronomical Institute, 13 Universitetskij prospekt, Moscow, 119899 Russia
M.V. Kozin
Affiliation:
Sternberg Astronomical Institute, 13 Universitetskij prospekt, Moscow, 119899 Russia
E.E. Lekht
Affiliation:
Sternberg Astronomical Institute, 13 Universitetskij prospekt, Moscow, 119899 Russia
A.E. Nadjip
Affiliation:
Sternberg Astronomical Institute, 13 Universitetskij prospekt, Moscow, 119899 Russia
S.V. Fomin
Affiliation:
Sternberg Astronomical Institute, 13 Universitetskij prospekt, Moscow, 119899 Russia

Abstract

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Since 1994, observations of a sample of about 20 Mira Ceti-type and semiregular variables have been carried out in three spectral ranges: radio (H2O maser line λ = 1.35 cm), optical (spectroscopy and UBV photometry) and infrared (JHKLM photometry). Time series of the Hα emission intensity and H2O line flux, covering several periods of the stars, have been obtained. Correlation of the intensity variations of the H2O maser with optical variability in the maser stars RR Aql, U Ori, VX Sgr and others was confirmed. One of the most interesting results is the flare of the H2O maser emission in R Leo, which happened in autumn 1997, 14 months after a flare of the Hα emission.

Type
Part 2. Pulsation, Mass Loss, Cool Envelopes
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 201 - 206
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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