Impact of binary interaction on the evolution of blue supergiants The flux-weighted gravity luminosity relationship and extragalactic distance determinations

Farrell, E. J.; Groh, J. H.; Meynet, G.; Kudritzki, R.; Eldridge, J. J.; Georgy, C.; Ekstrom, S. und Yoon, S. -C. (2019): Impact of binary interaction on the evolution of blue supergiants The flux-weighted gravity luminosity relationship and extragalactic distance determinations. In: Astronomy & Astrophysics, Bd. 621, A22

Abstract

A large fraction of massive stars evolve in interacting binary systems, which dramatically modifies the outcome of stellar evolution. We investigated the properties of blue supergiants in binary systems and whether they are suitable for extragalactic distance determinations using the flux-weighted gravity luminosity relationship (FGLR). This is a relationship between the absolute bolometric magnitude M-bo1 and the spectroscopically determined flux-weighted gravity g(F) = g/T-eff(4), where g is the surface gravity and T(eff )is the effective temperature. We computed a grid of binary stellar evolution models with MESA and use the v2.1 BPASS models to examine whether they are compatible with the relatively small scatter shown by the observed relationship. Our models have initial primary masses of 9-30 M-circle dot, initial orbital periods of 10-2511 days, mass ratio q = 0.9, and metallicity Z = 0.02. We find that the majority of primary stars that produce blue supergiant stages are consistent with the observed FGLR, with a small offset towards brighter bolometric magnitudes. In between 1%-24% of cases, binary evolution may produce blue supergiants after a mass transfer episode, that lie below the observed FGLR. A very small number of such stars have been found in extragalactic FGLR studies, suggesting that they may have evolved through binary interaction. Some models with shorter periods could resemble blue hypergiants and luminous blue variables. We used CMFGEN radiative transfer models to investigate the effects of unresolved secondaries on diagnostics for T(eff )and g, and the biases on the determination of interstellar reddening and M-bo1. We find that the effects are small and within the observed scatter, but could lead to a small overestimate of the luminosity, of T(eff )and of g for extreme cases. We conclude that the observed FGLR can, in principle, be well reproduced by close binary evolution models. We outline directions for future work, including rotation and binary population synthesis techniques.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0004-6361
• Sprache: Englisch