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- Title
OH/IR stars and the Period-Luminosity Relation of Mira variables.
- Authors
Engels, D.; Etoka, S.; Jiménez-Esteban, F.; Herrmann, W.; López-Martí, B.
- Abstract
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 W 3 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.
- Subjects
ASYMPTOTIC giant branch stars; VARIABLE stars; CIRCUMSTELLAR matter
- Publication
Proceedings of the International Astronomical Union, 2022, Vol 18, Issue S376, p328
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921323002983