| Issue |
A&A
Volume 669, January 2023
|
|
|---|---|---|
| Article Number | A60 | |
| Number of page(s) | 8 | |
| Section | Catalogs and data | |
| DOI | https://doi.org/10.1051/0004-6361/202141782 | |
| Published online | 09 January 2023 | |
Do Miras show long secondary periods?★
Astronomical Observatory, Jagiellonian University,
ul. Orla 171,
30-244
Kraków, Poland
e-mail: michal1.pawlak@uj.edu.pl
Received:
13
July
2021
Accepted:
12
October
2022
Aims. The long secondary period (LSP) phenomenon, which is commonly observed in pulsating red giants, has not been detected in any Mira yet. The goal of this work is to verify, if there is a physical reason for this or if it is simply an observational bias.
Methods. The OGLE-III Sample of Long Period Variables in the Large Magellanic Cloud, containing 1663 Miras, is used to perform a search for secondary periodicity in these objects and identify candidates for the long secondary period stars based on the location on the period-luminosity diagram.
Results. Out of 1663 Miras, 108 were identified as potential candidates, with variability broadly consistent with LSP. This makes 7% of the whole Mira sample in the Large Magellanic Cloud. Most, if not all, of the Mira LSP candidates are C-rich stars.
Conclusions. The results of this analysis suggest that Miras may exhibit long secondary periods. However, the long-term variability can also be related to the period and amplitude irregularities that Miras are known to exhibit. Further study will be necessary to draw a definitive conclusion.
Key words: stars: AGB and post-AGB / stars: variables: general / pulsars: general / Magellanic Clouds
Full Table 1 is also available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/669/A60
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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