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Published August 29, 2024 | Version v1
Poster Open

Single vs binary hot subdwarfs: Towards a 200-pc volume-limited complete sample

  • 1. Istituto Nazionale di Astrofisica

Contributors

  • 1. ROR icon Centre for Astrophysics of the University of Porto
  • 2. ROR icon University of Porto

Description

From current statistics, based on magnitude-limited samples, ~35% of sdO/B hot subdwarfs are in close binaries with M-dwarf/WD companions, ~30% are in wide binaries with FGK MS stars, and ~35% are apparently single. However, without a companion it is hard to explain the huge mass loss near the RGB tip needed to form an sdB star. The presence of a substellar companion, difficult to detect, is a possibility. The goal of this project is to shed light on the formation mechanisms of single sdO/B stars by searching for binary signatures on a small but complete 200-pc volume-limited sample using different data/methods: TESS light curves, Gaia spectra, SEDs, and precise RVs from HARPS/HARPS-N spectra.

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P94_Silvotti_Roberto.pdf

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