Unveiling the Evolutionary State of Three B Supergiant Stars: PU Gem, ϵ CMa, and η CMa

0576370 - ASÚ 2024 RIV CH eng J - Článek v odborném periodiku
Sánchez Arias, Julieta Paz - Németh, Péter - de Almeida, E.S.G. - Ruiz Diaz, M. A. - Kraus, Michaela - Haucke, M.
Unveiling the Evolutionary State of Three B Supergiant Stars: PU Gem, ϵ CMa, and η CMa.
Galaxies. Roč. 11, č. 5 (2023), č. článku 93. E-ISSN 2075-4434
Grant CEP: GA ČR(CZ) GA20-00150S; GA ČR(CZ) GA22-34467S
GRANT EU: European Commission(XE) 823734 - POEMS
Institucionální podpora: RVO:67985815
Klíčová slova: massive stars * supergiants * winds
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 2.5, rok: 2022
Způsob publikování: Open access

We aim to combine asteroseismology, spectroscopy, and evolutionary models to establish a comprehensive picture of the evolution of Galactic blue supergiant stars (BSG). To start such an investigation, we selected three BSG candidates for our analysis: HD 42087 (PU Gem), HD 52089 (ϵ CMa), and HD 58350 (η CMa). For our analysis, we utilized the 2-min cadence TESS data to study the photometric variability, and we obtained new spectroscopic observations at the CASLEO observatory. We used non-LTE radiative transfer models calculated with CMFGEN to derive their stellar and wind parameters. For the fitting procedure, we included CMFGEN models in the iterative spectral analysis pipeline XTgrid to determine their CNO abundances. The spectral modeling was limited to changing only the effective temperature, surface gravity, CNO abundances, and mass-loss rates. Finally, we compared the derived metal abundances with prediction from Geneva stellar evolution models.
Trvalý link: https://hdl.handle.net/11104/0345940