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OH/IR stars and the Period-Luminosity Relation of Mira variables

Published online by Cambridge University Press:  06 February 2024

D. Engels Open the ORCID record for D. Engels [Opens in a new window] ,
S. Etoka Open the ORCID record for S. Etoka [Opens in a new window] ,
F. Jiménez-Esteban ,
W. Herrmann  and
B. López-Martí
D. Engels*
Affiliation:
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
S. Etoka
Affiliation:
JBCA, University of Manchester, M13 9PL, Manchester, UK
F. Jiménez-Esteban
Affiliation:
Centro de Astrobiologa (CAB), CSIC-INTA, Camino Bajo del Castillo s/n, 28692, Villanueva de la Cañada, Madrid, Spain
W. Herrmann
Affiliation:
Astropeiler Stockert e.V., Astropeiler Stockert 1-4, 53902 Bad Münstereifel, Germany
B. López-Martí
Affiliation:
Universidad San Pablo-CEU, Campus de Monteprncipe, 28668 Boadilla del Monte, Madrid, Spain
*
email: dengels@hs.uni-hamburg.de
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Abstract

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The OH/IR stars evolving on the Asymptotic Giant Branch are large-amplitude variable stars with periods in the range of ~400 to 2500 days, significantly longer than those of the related Mira variables. We use preliminary results from a monitoring program of the 1612-MHz OH maser variations of a sample of > 70 OH/IR stars to study a possible extension of Mira Period-Luminosity Relations to longer periods. The period distribution of the sample is split around P ~ 1100 days. Using WISE W3 absolute magnitudes as proxies for the luminosity and the best available distances, we found no convincing relation between periods and absolute magnitudes. A cause could be rapid evolution of the ‘extreme OH/IR stars’ (the group with P >1100 days) close to the tip of the AGB, where no increase of luminosity is expected on the short time-scales involved.

Keywords

masersstars: AGB and post-AGBcircumstellar matter
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S376: At the crossroads of astrophysics and cosmology: Period–luminosity relations in the 2020s , December 2022 , pp. 328 - 333
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re- use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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