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Lego Figure holding a lego telescope. Photo

Michal Pawlak

Postdoctoral fellow

Lego Figure holding a lego telescope. Photo

Investigating the long secondary period phenomenon with the ASAS-SN and Gaia data

Author

  • Michał Pawlak
  • Michele Trabucchi
  • Laurent Eyer
  • Nami Mowlavi

Summary, in English

Aims. The aim of this work is to create a complete list of sources exhibiting a long secondary period (LSP) in the ASAS-SN catalog of variable stars, and analyze the properties of this sample compared to other long period variables without an LSP. Methods. We used the period-amplitude diagram to identify the 55 572 stars showing an LSP, corresponding to 27% of the pulsating red giants in the catalog. We used astrometric data from Gaia DR3 and spectroscopic data provided by the APOGEE, GALAH, and RAVE surveys to investigate the statistical properties of the sample. Results. We find that stars displaying an LSP have a spatial distribution that is more dispersed than that of the non-LSP giants, suggesting that they belong to an older population. Spectroscopically derived ages seem to confirm this. The stars with an LSP also appear to be different in terms of the C/O ratio from their non-LSP counterparts.

Department/s

  • Astrophysics

Publishing year

2024-02-01

Language

English

Publication/Series

Astronomy and Astrophysics

Volume

682

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • pulsars: general
  • stars: AGB and post-AGB
  • stars: variables: general

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-6361