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Circumstellar molecular maser emission of AGB and post-AGB stars

Published online by Cambridge University Press:  30 December 2019

Georgij Rudnitskij Open the ORCID record for Georgij Rudnitskij [Opens in a new window] ,
Nuriya Ashimbaeva ,
Pierre Colom ,
Evgeny Lekht ,
Mikhail Pashchenko  and
Alexander Tolmachev
Georgij Rudnitskij
Affiliation:
Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow, 119234Russia email: gmr@sai.msu.ru
Nuriya Ashimbaeva
Affiliation:
Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow, 119234Russia email: gmr@sai.msu.ru
Pierre Colom
Affiliation:
LESIA, Observatoire de Paris-Meudon, UPMC, Université Paris–Diderot, 92195 Meudon CEDEX, France
Evgeny Lekht
Affiliation:
Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow, 119234Russia email: gmr@sai.msu.ru
Mikhail Pashchenko
Affiliation:
Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow, 119234Russia email: gmr@sai.msu.ru
Alexander Tolmachev
Affiliation:
Pushchino Radio Astronomy Observatory, Astrospace Center, Lebedev Institute of Physics, Russian Academy of Sciences, Pushchino, 142290Russia
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Abstract

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Results of long-term studies of circumstellar molecular maser emission of late-type giant and supergiant variable stars are reported. In the 1.35-cm H2O line, the peak flux density correlates with the optical brightness lagging behind it by 0.3–0.4 P (P is the stellar period). “Superperiods” of 10 to 15 P are visible in several stars, demonstrated as high maxima in the visible light curve and associated flares in the H2O maser line. In the 18-cm OH lines, full polarization of the maser emission has been measured. Variable Zeeman patterns suggesting a changing magnetic field of a few milligauss have been detected.

Keywords

stars: late-typestars: windsoutflowsstars: mass lossstars: magnetic fieldsradio lines: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 493 - 494
Copyright
© International Astronomical Union 2019 

References

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