The origin of subdwarf B stars

Aubrey, Callum and Napiwotzki, Ralf 2023. The origin of subdwarf B stars. Presented at: 10th Meeting on Hot Subdwarfs and Related Objects, 13-17 June 2022. Bulletin de la Société Royale des Sciences de Liège. , vol.92 (2) 10.255118/0037-9565.11190

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Abstract

The origin of subdwarf B stars (sdBs) is unclear. Different formation channels are proposed including: close-binary evolution, helium-mixing on the red giant branch and the hot flasher scenario. Circumstantial evidence exists that sdBs can result from single star evolution in high metallicity populations. We investigate this possibility by using membership in the thin, thick disk and halo populations as a metallicity indicator. Radial velocity measurements were com-bined with Gaia proper motions to calculate space motions in the Galaxy. Galactic orbits and population memberships were derived. Preliminary results indicate more sdBs are members of the thin disk (86 sdBs) than of thick disk and halo (28 sdBs). Apparently single sdBs are found among all three populations. We look into the temperature distributions of the different types and discuss implication for formation scenarios.

Item Type:	Conference or Workshop Item (Paper)
Status:	Published
Schools:	Physics and Astronomy
ISSN:	0037-9565
Related URLs:	Publisher
Date of First Compliant Deposit:	4 October 2023
Date of Acceptance:	10 February 2023
Last Modified:	12 Oct 2023 11:30
URI:	https://orca.cardiff.ac.uk/id/eprint/162958

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